Category Archives: Dysynni

A first-time walk from Happy Valley towards the Dysynni

I hadn’t seen my friend Caroline for ages, so it was great to do one of our social distancing walks, and one that was new to me, taking in a tiny prehistoric stone circle.  The track is marked on the OS map as a “byway open to all traffic” and follows the line of the Nany Braich-y-rhiw stream, at a higher level.  The views were as spectacular as they always are when you get on to the higher ground in these parts, into the Dyfi valley at the start of the walk, into Happy Valley, and eventually, ahead into the Dysynni valley.  The track is very deep and carved out of the bedrock in places, just like the Aberdovey estuary’s “Roman Road,” which is actually thought to date to the 1820s.  We drove to the point of departure in separate cars, parking on verges, as it is a long hike to reach the start from Aberdovey, and then a long hike in its own right.  On this occasion it was a there-and-back walk rather than a circular one, but just as good because the views are different in each direction.  It was 19th September and the weather was in our favour.

On the map below I’ve marked the starting point in red, and have put blue dot where another path descends into the valley, more or less opposite the Bearded Lake.  Although we carried on along the main track, you can make a lengthy circular walk if you take the path into Happy Valley, and it would probably be easiest to park in the official Happy Valley car park if you are going to do that (which also serves as the car park for those wanting to walk up to the Bearded Lake).

It’s an easy walk if you have good footwear, with a good track and no very steep gradients.  It should also be avoided in wet weather, or at least go in heavy duty footwear.  It had been very dry for the previous week, but we still ended up having to walk off the path in certain places as it was swamped with mud, and was often marshy either side of the path.  There were several points at which we had to ford fairly wide streams, two of which are marked on the map as fords. It was very windy even on a sunny day, so head gear would be a sensible precaution.  The only cloud on the horizon was that at weekends it is used by trial bikers, travelling at speed, with precious little care for any walkers who might be round the next corner.  Thanks to the noisy engines, you can hear them coming and get out of the way, but I recommend that you avoid walking there at weekends.

The stone circle is a little way along the path, up to the right, just a few seconds to reach it from the footpath.


The walk offers beautiful views over Happy Valley and the hills beyond.

Watch out for the Bearded Lake on the other side of the valley to the left, on this occasion glistening in the sun like a silver mirror.  I’ve written about the legends associated with the lake on an earlier post.

We walked past the footpath down into Happy Valley, which would have formed a circular walk, and headed instead for the views ahead, which offer an unexpected sight of the Dysynni valley.

As it descends towards the Dysynni, the track meets the stream, Nant Braich-y-rhiw.

At this point, descending towards the Dysynni valley, we turned back towards the cars, but if you carry on you reach a single-track B-road that crosses the Talyllyn railway at Rhyd-yr-onen and finishes in Bryncrug.  It was an equally beautiful walk on the return leg.  I suppose it was about an hour and half in each direction, pausing to enjoy the views with a picnic.

 

Bryncrug Six: a self-guided walk in the Bryncrug area from “Country Walking” magazine

Years ago my parents used to take a magazine called Country Walking, which is still going strong, as a companion and guide to the walks they did all over Britain.  I am currently having a massive sort-out and today went through a large number of leaflets and walks, keeping some and disposing of others, always a horrible job.  This walk, torn out of the January 2004 issue of Country Walking looks excellent.  The introduction says that in 1993 local ramblers launched and won a campaign to save the route, known as Bryncrug Six, as a public right of way.  This is the victory referred to at the top of the article.  I have checked on the OL23 Ordnance Survey map, and the paths are all marked on it.  You can either head out by the Tal y Llyn railway, or park in Bryncrug, from where the walk starts.  Although I haven’t tried all of it yet, being somewhat obsessed with hillforts at the moment, I’ve walked the section between 6 and 7, which is excellent.  The untidy blue and purple annotations are mine, for my own use, as I found the black and white a bit of a jumble, making it a bit difficult to distinguish roads from streams.

A walk up Craig yr Aderyn (Bird Rock) #2 – the Iron Age hillfort

Looking up at Craig yr Aderyn from the medieval castle Castell y Bere in the Dysynni valley to the west

This walk has been divided into two, partly because I went crazy with the camera and took too many photographs, but also because I had quite a lot to say about the hillfort.  The second post, this one, is about the hillfort and what can be seen from it.  The first one was about the walk itself, how to get to it, where the two different forks take you to, and what views can be seen from parts of the route.

I am currently walking as many of the nine Iron Age hillforts in the local area as I can before winter sets in.  Or at least, I am when it’s not sloshing with rain and there’s no haze or mist to obscure views.  Fortunately there has been some glorious weather recently, after a rather soggy summer.  One of the wonderful things about hillforts is that the views are often terrific, and Craig yr Aderyn is simply the best.  It dominates the Dysynni valley from miles around, catching the light in dramatic ways, but I had never seen it up close.  Approaching it along the lovely road from Llanegryn for the first time, I was somewhat staggered when I rounded a corner and suddenly found it looming over me.  Drifting happily down the road, I had no idea that I had arrived so near to it.

Craig yr Aderyn is a highly visible local landmark in the Dysynni valley (SH643068), and is approached by small B-roads from Bryncrug or Abergynolwyn.  For full details of reaching Craig yr Aderyn and the route up, see my other post, about the walk rather than the hillfort.

A distinctly soggy part of the Dysynni floodplain.

Craig yr Aderyn, which translates as Rock of Birds, or more usually Bird Rock, is a major local landmark, abutting the of the Foel Wyllt hill ridge overlooking the Dysynni valley from the south. The course and character of the river Dysynni have changed over time.  Before the 18th century the estuary reached almost to the foot of Craig yr Aderyn, but the river silted up and is no longer navigable.  The land has been drained since the 1700s to create better quality land for farming, although standing looking down from the summit, it is quite clear that the land to the west still has some very boggy patches marked by beds of spiny rush (Juncus acutus), which is found in all freshwater flats, bogs and marshes herabouts.  It is not known what it looked like in prehistory, but the presence of a glacial valley with Cadair Idris at its back indicates that a melt-water river certainly passed Craig yr Aderyn on its way to the sea, and this will have established a valley route into which later hill drainage descended.  It would be useful to know what it was like during the Iron Age.

According to a Snowdonia Active publication (2018) the crag is made of rhyolitic tuff, rock formed from volcanic ash laid down after a major eruption through the Bala fault line c.800 million years ago.  It is separated from the hillside behind it by a saddle or col 100ft below the peak.  Its distinctive shape is immediately recognizable from miles around, almost always visible in the Dysynni area.  Its gaze always seems to follow you around.  Its summit is at 230m OD (700ft).  The hillfort is lower, at about 180 OD, 10m higher than the 170m OD Tal y Garreg, the next highest hillfort in the area.  Although the north face of the crag is very steep, the home of nesting birds and a route for rock climbers, there is a much more gradual approach to the rear.

Craig yr Aderyn is one of a small number of hillforts that were built near the Dysynni valley.  I’ve already posted about the two small hillforts at the mouth of the Dysynni, Tal y Garreg and Llechlwyd on Mynydd Garreg above Tonfanau, some 8km away to the west of Craig yr Aderyn.  Nearer to Craig yr Aderyn is Castell Mawr, c.5.5km to the west as the crow flies, about which I have also posted.  See the map at the end of the post.

At Craig yr Aderyn all of the hillfort construction work took place on a natural shelf beneath the rocky peak, which the hillfort incorporates.  Its man-made defenses consist of two phases of earthen and stone banks.  Today the fort’s ramparts are covered in grass, but most of them are still clearly visible, although it took me some time to trace them against the site plan on the ground.  Thankfully they are covered mainly with short turf rather than bracken or long grass, which makes the job much easier than at places like Castell Mawr.  The ramparts are impressive, and served to cut off the only realistic line of human access to the hillfort, as the other side is a sheer drop into the valley beyond from the summit of Craig yr Aderyn, some 270m below.  The combination of natural and stone-faced sloping man-made defenses makes this one of the most ostentations structures of this type in the area.  The site is thought to have been built in two phases.

This site plan shows how the ramparts are built into the rocks of the crag behind a natural shelf, using the existing topography as part of the design of the hillfort. The earlier phase is on the left, divided by a bank and ditch with a slightly inturned entrance. The second phase is on the right with a much deeper inturned entrance that forms a short passageway.  Source:  Bowen and Gresham 1967

The most obvious features of the first phase are the two sets of ditches and eroded banks, which once formed ramparts that were stone-faced.  This is sometimes called the upper fort.  There was an in-turned entrance at the southeast side through a gap in the rampart.  The enclosed area encloses approximately 0.8 hectares (just under 2 acres), and measures roughly 100 by 55m (c.330 x 180ft).  the shape formed against the line of the natural topography is a triangle.

Detail of the second phase entrance, with the inturned entrance forming something of a corridor into the second phase enclosure. Source: Bowen and Gresham 1967

In the second phase an additional line of banks and ditches were built on the eastern side to enclose a larger area of approximately 1.6 hectares, measuring 119 by 170m (390 x 560ft) on the east side, which was most vulnerable to attack. This included a substantial stone wall, much more impressive than the first phase.  Unfortunately, this has now collapsed, but its original line is still clearly visible.  Secondary improvements were a wall on the south side and two new banks to the east.  These were accompanied by another in-turned entrance, this a lot more prominent and well built than in phase 1.  Unlike the first entrance it could only be approached via a steep slope.  This is the entrance that the public footpath uses today, but even if you approach the hillfort at a tangent and follow a sheep track into the interior, the entrance is unmistakable from the interior.

The early excavations at Craig yr Aderyn, such as they were, produced very little in the way of dateable artefacts, and although a pottery sherd was identified at the time as Romano British, I have not seen any modern opinion on the subject of its date, and have no idea where the sherd itself is located today.  Even if this tenuous evidence was validated, it is not enough to tie in in with the other hillforts in the area, as none of those have been excavated and the architecture itself is only suggests very approximate dating.

View to the northwest from the summit

The location of the site is commanding.  It is c.9 km inland and therefore although the sea is visible, it has no view over the comings and goings of anything that was travelling along the coast.  If it was in league with any or all of the Tal y Garreg, Llechlwyd or Castell Mawr hillforts, that may not have been important.  What it did have, and still does, is  remarkable views over the Dysynni valley to the west and east from the summit, and good views towards the hill slopes to the north and south.   It is lower than many of the surrounding hills to north and south, but difficult to reach except via the saddle connecting it to the main hillside to its north.

View to the west

View to the east

Stone-fronted ramparts

The function of this hillfort remains unknown.  Even at 180m OD (590ft), Craig yr Aderyn cannot be completely ruled out as a settlement, but it it was very small, and would certainly be extremely inconvenient for permanent living, just like the other hillforts so far visited.  Although there are level surfaces that might have been suitable for settlement huts and storage, the only signs of settlement that have been found to date are an indeterminate feature found in 1874, and two possible and unconfirmed platforms in the south-east corner found in the 1921.   Whilst it might have been used as a seasonal settlement for taking sheep herds into the hills, it seems far too elaborate for this sort of role, particularly given the human resources required to build the impressive stone facing of the ramparts.

The entrance to the phase 2 extension to the hillfort

The stone-faced ramparts and entrance are themselves interesting, unique in the Dysynni area, and suggest that the site was particularly important to its builders.  In his overview of the Iron Age, Timothy Darvill in his overview of mentions that after c.400BC a number of sites were provided with sloping stone-faced ramparts, which he suggests were as much for ostentation as defense.  In a more recent discussion, focused on the Ceredigion hillforts, Toby Driver points to these as a recurring theme in that area, and he too suggests that they may have been intended to give the appearance of strength, a deterrent rather than being strictly defensive.  Although they would have required substantial investment in effort to build them, they would have been relatively easy to maintain, as their survival today demonstrates.

Upper (phase 1) and lower (phase 2) ramparts, both stone-faced

If there was insufficient stone for the facing from digging out the ditches, there was plenty of loose stone available for the ramparts.  Nearby rockfalls from the hill behind Craig yr Aderyn would have done the trick, and it is quite likely that those prominent today were the result of glacial activity.  The rocks in the immediate area were much bigger than any of those used for the stone facing, so they were probably broken up.  Interestingly, much of that rock is quartzite, some of it quite massive, but none of that was used in the rampart facing.  This suggests that the builders had a very specific vision, and it didn’t include quartzite.

The hillfort coming into view along the col (or saddle).

One slight oddity if the hillfort was to impress, is that it is not visible from a distance.  It is only when one is almost upon it that the impressive stonework comes into view.  Its appearance is defensive, because the ramparts are large and stone-faced, and the entrance well built, but the approach is not particularly challenging.  I paused twice for a breather on my way up, but I’m in my mid 50s and not at optimal fitness.  For a fit person it would present no difficulties at all, and for a hypothetical raiding party accustomed to such tasks it would have been all in a day’s work.  The approach is out of direct line of sight of the hillfort itself, and partly obscured even from the summit.  If its role was primarily defensive, lookouts would have to be stationed in the area to ensure that any threat was detected early.  its potential as a defensible retreat was tried and tested during the 10th Century AD when, according to a publication by Snowdownia Active, Tywyn was attacked and burned by Norsemen.  When they approached from the sea a warning beacon was lit on the coast, and Tywyn residents retreated to Craig yr Aderyn.  There are related theories for use.  One  are that the site might have been used as a refuge for local farming families or the most important of the local elite if there was conflict over land, or it could have been used as a secure communal store for important raw materials, food and craft products, including livestock.  There is really nothing to help narrow down a precise role.

Map showing the known hillforts in the area (my annotations in yellow). Source of map: Archwilio

From Craig yr Aderyn there is a 360 degree view of the surrounding landscape.  From the hillfort it is a very short walk to the summit where there is an excellent, uninterrupted line of sight west to Mynydd Garreg and the sea in the distance, along the Dysynni valley.  Although I couldn’t make out the trig point or ramparts on Tal y Garreg hillfort through my telephoto lens, the ramparts are certainly in the line of sight.  The promontory on which Llechlwyd sits was easy to make out and I could see where Castell Mawr was located.  Bwlch too, which I haven’t yet visited, was easily visible, with its unmistakable trig point.  These lines of sight would have been no use at all for seeing what people were up to, because the other hillforts were simply too far away, but would be invaluable if the occupants were signalling to one other about any threats from outside the area, including from the sea.  There are no known hillforts nearer to Craig yr Aderyn.

The ridge at the left of the photograph, at the end of the Dysynni valley is Mynydd Garreg. Llechlwyd and Tal y Garreg hillforts are at the coastal end, and Castell Mawr at the opposite end of the ridge. Bwlch is also visible at far right. Views from Craig yr Aderyn

Bwlch hillfort from Craig yr Aderyn

Phase 2 ramparts, incorporating an enclosure that may be later in date

The second phase of the hillfort argues a renewed interest in securing the space, extending it over a larger area and adding further stone-faced ramparts.   Two distinct phases of hillfort construction have been identified at many sites elsewhere in Britain.  Although it is unknown whether the two phases at Craig yr Aderyn conform to this pattern, it seems worth giving a brief outline of the general framework.  The first British phase of hillfort building occurs, at the transition between the Late Bronze Age and the early Iron Age at c.800BC, gaining momentum after c.600BC.   These were generally single rampart-and-ditch (univallate) structures.  The addition of more defenses and additional banks and ditches then came substantially later, at a time when some other hillforts were abandoned at around 400BC.

Craig yr Aderyn from the hillfort Castell Mawr

Some hillforts in the south of England continued to be used into the Roman period.  It would not be surprising if those in  west Wales, became overtly defensive during and after the Roman invasion of Wales in AD74.  If the identification of Romano-British pottery was accurate, this might have coincided with a new anxiety about protecting the community from the threat of Roman incursion, or the threat of raiders coming to secure products to accumulate resources that would help negotiations with Roman traders or native traders securing goods to sell to the Romans.  According to Roman sources Britain was a good source of slaves, and rural areas were likely targets.

If it emerges that the local hillforts were contemporary at the time of their original construction,  I am leaning towards a completely speculative model of fortified sites being used to enable people to stay in touch and share early warnings about potential threats from further afield.  More about the role and function of local hillforts will be discussed on a future post, once I have finished visiting all nine hillforts (four down, five to go).

Sources:

Bowen, E.G. and Gresham, C.A. 1967.  History of Merioneth, volume 1.  From the earliest times to the Age of the Native Princes.  The Merioneth Historical and Record Society.

Cunliffe, B. 1995.  Iron Age Britain.  Batsford

Driver, T. 2013.  Architecture, Regional Identity and Power in the Iron Age Landscapes of Mid Wales.  The Hillforts of North Ceredigion.  BAR British Series 583.

Gwynedd Archaeological Trust 2009.  A visitor guide to the main Iron Age hill forts of Meirionnydd.  Project No. G1770. Report No. 839

RCMHCW 1921.  Royal Commission on the Historical Monuments and Constructions in Wales and Monmouthshire.  An Inventory of the Ancient Monuments in Wales and Monmouthshire.  Volume IV: The County of Merioneth.

Sjöberg, K.S. 2014.  Hidden possibilities.  Possible uses of hillforts in southern Gwynedd, north-west Wales. Unpublished Masters thesis, Uppsala University, Department of archaeology and ancient history. http://www.diva-portal.org/smash/record.jsf?pid=diva2%3A799381&dswid=8151

Snowdonia Active 2018. Craig yr Aderyn. Site Guides for Recreation.  Protected Landscapes of Wales.

Websites:

Archaeology Data Service
https://archaeologydataservice.ac.uk

Coflein
https://coflein.gov.uk/en/archive/6512930/details/504
https://coflein.gov.uk/en/archive/6512928/details/504
https://coflein.gov.uk/en/archive/6512929/details/504

Gwynedd Archaeological Trust (no date).  Historic Landscape Characterisation: The Dysynni
http://www.heneb.co.uk/hlc/dysynni/dysynni2.html

Gwynedd Archaeological Trust (no date).  Hillforts in Dwyfor and Merioneth http://www.heneb.co.uk/merionethforts/9craigyraderyn.html

 

A walk up to Craig yr Aderyn (Bird Rock) #1 – the route and the scenery


I have divided my Craig yr Aderyn (Bird Rock) walk into two posts, of which this is the first.  The first focuses exclusively on the Iron Age hillfort.  This one looks at the walk itself, how to approach it, incidental information about the environment and views from all the parts of the walk that I did.  This has to be one of the most magnificent walks in the area.  You might want to drive on to the 13th century ruins of Castell y Bere if you have energy left afterwards.

Chough. Source and more details: RSPB

As well as a destination for some of the most fabulous views in the area, it is also well known as the nesting site of cormorants (the furthest inland nesting ground for cormorants in Wales) and red-billed choughs (the latter on the endangered list).  It is also houses a two-phase Iron Age hillfort.  The hill used to be inhabited by feral goats, which were introduced in the 1960s, but slowly died out.  In the more recent past the hill has been used as a quarry for road stone, but this has now been stopped.  Today it is protected as a Site of Special Scientific Interest and a Special Protection Area.  As the birds nest on the north face, they are undisturbed by walkers, and climbers are only allowed to scale that face outside the nesting season.

Map showing the parking area and the footpaths up Craig yr Aderyn. Source: Protected Landscapes of Wales

Craig yr Aderyn is a highly visible local landmark in the Dysynni valley (SH643068).  A narrow road skirts its base, unfortunately not identified with a number on the Ordnance Survey map. If you are familiar with Happy Valley, where you can usually squeeze two cars past for most of the way, halve that.  If you don’t like reversing, this may not be for you.  From all directions, it is a single track road with occasional passing places, and I had to reverse three times for quite a way, once around some steep corners.  From the west Craig yr Aderyn is best approached along the road from Bryncrug; from the east it can be approached from the B4405 from Abergynolwyn or via the very narrrow road through Abertrinant.

There is a small grassy parking area by the roadside at the foot of the hill, sufficient for about six or seven cars, and marked on the map above right, but not shown on the Ordnance Survey map.  There is a farm gate here that opens onto a public footpath, a rocky farm track that starts off quite steeply before levelling out for a bit, although it inevitably rises again.  After about 10 minutes,  the track carries on beyond a gate across a field, just before which the footpath veers right, a grassy break in the bracken heading up the slope.  If you find yourself pondering whether to go through another gate once out of the car park, you have gone too far.  This fork is not signposted, just has a 2ft tall post on the right of the track to mark its presence, so look out for it.

The path up from the car park

The gate in front of a track heading over the field, and the small post at the centre right of the photograph, where you turn up onto the hillside.

The public footpath that leads from the track up the hillside

The path from here is good, but climbs a lot more steeply, and doesn’t let up much.  In winter it is likely to be very wet, as even in Monday’s high heat, after two very dry days, it was distinctly soggy in places. Don’t forget to keep turning round to enjoy the fantastic views.  There’s almost no sound up there except for the tiny birds that nest in the long grass, and some crows.

 

When you have been walking for perhaps another 15 minutes there is another fork, which is not signposted in any way, but is clearly visible on the ground as wide turf tracks that make their way through low bracken.  One track leads to the hillfort on Y Pallis Bach (the low stockade) and the other leads to Col Crag, the foot of a small crag that sits on the saddle that connects Craig yr Aderyn (Bird Rock) with the main line of the hill behind.

There’s a very well-timed bench at this fork in the path, dedicated to Nick (I don’t know who he was, but I love him), which is at the perfect point for taking a much-needed breather on a seriously hot day and admiring the views.  I flopped with enthusiasm.  Once you have enjoyed a slurp of water and enjoyed the scenerey, you simply follow the right hand fork beyond the bench to reach the hillfort, which you can see from the bench, or you can head left to go to Y Pallis Bach.  I do recommend the views from Craig yr Aderyn.

Thread your way up through the main entrance of the Iron Age hillfort, which is flanked by two great banks of local stones.  This is the second phase entrance (see my post about the hillfort if you’re interested).  Keep heading upwards for a couple minutes and you will very soon reach the summit.  Pause and enjoy.  The world is your thoroughly fantastic oyster – the whole of the western Dysynni valley rolls out before you, a truly astonishing sight.  Head a little way down from the summit, nearer to the edge, and the view is even better.   I plonked down on a convenient rock and was only sad that I hadn’t brought a picnic.  This has to be the ultimate picnic spot.  Next time.

After a very lazy sit in the sun and loving the view, I retraced my steps to the hillfort.  I had an archaeological site plan for the hillfort and try to match up the plan with what is left on the ground.  As I came down I bumped into a lovely couple who had left their car in Dolgellau and were on a six night camping hike, looping back to Dolgellau at the end of their holiday.  Now that’s serious walking!  Very impressive.  They were looking for a way down the other side of the hillfort rather than retracing their steps.  I didn’t see them again, so perhaps they found a route.

Having sorted out the hillfort features to my own satisfaction, I walked below the bottom wall towards the west to have a look at the view from there.  It’s better from the top, but still very fine.  If you’ve chosen to go to Craig yr Aderyn first and afterwards decide to go to Y Pallis Mawr, you can take a short cut by crossing towards it following sheep tracks rather than going back to the fork in the official footpath.  The marsh symbols on the above map aren’t kidding, and there are big patches of beds of spiny rush (Juncus acutus) and a large pond surrounded by small birds enjoying a bath and a drink, so stay above the dark spiky tell-tales, following the sheep tracks, and you’ll hopefully retain dry feet.  You rejoin the footpath and find yourself at the foot of a smaller, more conical peak between Craig yr Aderyn and the main hill’s peak.  The public footpath stops here, but if you feel inclined to walk up to the high crag of the hill behind, be aware that it is steep and is a scramble over rocks alongside a barbed wire fence, with a fairly convincing drop immediately to your right.  It convinced me to give it a miss.

Instead, I turned to walk down the side the hillside where there is a huge rockfall, which I was guessing was the main source of stone for the stone-lined ramparts.  These are enormous chunks of rock, with a lot of bright white quartz in amongst the dull grey.  I rounded the base of the conical peak and returned back towards the footpath, heading down the hill to the carpark.  The views were just as good on the way back.  Bliss!

Craig yr Aderyn from Castell Mawr:

 

A walk to Llechlwyd Iron Age hillfort, Tonfanau

The location of the two hillforts above Tonfanau, with Llechlwyd on the promontory, right.

Llechlwyd (sometimes referred to as Llechrwyd) hillfort is located on a long, narrow promontory that extends out from the hill above Tonfanau, Mynydd Garreg (Garreg hill), a short distance from Tywyn.  Llechlwyd means “grey (lwyd) stone (llech).”  At a height of 70m OD it is considerably lower than nearby Tal y Garreg hillfort (170m OD).  If you have not read my post about Tal y Garreg hillfort I suggest you read that first, because this post makes frequent reference to it.  Like Tal y Garreg, Llechlwyd has not been excavated, but it conforms to the basic design of an Iron Age hillfort, and is generally accepted to be of that period.  Llechlwyd is only a short walk from Tal y Garreg, but is a rather more difficult hillfort to reach.  The relative positions of the two hillfort are shown in the aerial photograph on the above left. The dark shadows to the left of both hillforts highlight parts of the Tonfanau stone quarry, which has cut away bits of both.

My route up and down Mynydd Garreg, above Tonfanau.  The shading in purple shows Tal y Garreg at the top and Llechlwyd below.  Source: Archwilio, with my route drawn in.

The routes up and down the hill that I took can by seen at the end of the post.  Apologies for the legend “style” instead of “stile” in the photographs above and left, but I only realized after I had posted this piece.  I parked by the Tonfanau bridge, on the Tywyn side, and walked to the bridle path, up the hill, over the stile, and back along the ridge towards the easily visible hillfort of Tal y Garreg, which makes excellent use of a natural rise in the topography.  Then, instead of going through the fence to Tal y Garreg, I turned left and walked along the fence, passing Tal y Garreg on my right.  This fence leads directly into Llechlwyd. On the aeriel photograph above it looks like a straightforward walk along the ridge, but in fact there’s a rather steep drop from the ridge to the promontory below, with a 100ft difference between the heights of the two hillorts. This can be seen clearly in the picture at the top of the post.  The route down is along very indistinct sheep tracks through coarse gorse – very rough on the lower legs if you are wearing shorts!  There’s no way through the fence, which is topped with barbed wire, and it splits the hillfort in two, so you have to retrace your footsteps towards Tal y Garreg when you want to return to the valley.  I returned via the quarry track that leads down into the old quarry yard, which itself is part of a footpath that skirts the northern base of the hill.

The date range for Llechlwyd is unknown because the site has not been excavated.  It has features typical of an Iron Age hillfort, but as the the Iron Age spans the period c.800/600BC – AD43, overlapping with the Roman occupation (AD43-c.410) that doesn’t narrow it down a great deal.  Unfortunately the structural remains alone are not sufficient to establish a narrower time frame.

Aerial view of Llechlwyd, annotated. Source of photograph: Coflein

Llechlwyd is something of a curiosity.  Although it has excellent views over the Dysynni valley and the coast to the north and south, it is in a very low position relative to the line of the hill above and behind it, with absolutely no visibility of anyone approaching along the ridge.  Although there are two banks and ditches across the promontory, it would be incredibly difficult to defend if the promontory was approached from the rear.  This would argue that either it was used in conjunction with Tal y Garreg hillfort, or that its purpose was not defensive.  Tal y Garreg today is often hidden within low cloud, not an ideal feature for a site presumably located at least partially for its views over the surrounding landscape.  In the Iron Age the temperature fluctuated, but was generally far more wet and cloudy than in the preceding Bronze Age.  This might be a good reason for establishing a secondary, lower fort to maintain clear visibility even in bad weather.  Unfortunately, it is not known whether Llechlwyd and Tal y Garreg were actually contemporary.

Another view of Llechlwyd. Source: Apple Maps

The quarry has removed part of the site, but the remaining banks and ditches are still visible and the aerial photographs above and left show where the large banks and entrance are located along the promontory. The big inner rampart, 3.6m high, consists primarily of stone.  The outer rampart is 3.2m high and the ditch 1.9m deep. The entrance, at the west end, is in-turned and sits on a steep slope of the hill. The steep sides provided enough protection on three sides, and the banks and ditches were used to secure the access to the ridge.  No excavation or geophysical survey have taken place, and the aerial photographs reveal nothing about what may lie beneath the surface of the hillfort, so we remain ignorant of any possible hut circles or storage structures.

The hillfort has lines of sight to Bwlch hillfort on Foel Llanfendigaid, c.2km to the north, and Craig yr Aderyn (Bird Rock), c.8km to the east.   Its main views are over the Dysynni valley immediately at its foot, as far as Craig yr Aderyn, and along the coast to the north and south.  The modern quarry makes the lines of sight between Llechlwyd and Tal y Garreg difficult to assess.  It is possible that the occupants of Llechlwyd would have been able to see a stretch of the ramparts of Tal y Garreg, and by the same token the occupants may have been able to see into Llechlwyd, but it is also possible that the topography blocked the line of sight completely.  It is a marvellous spot for a look-out over the lowlands, but, as mentioned above, to its rear it is overlooked by a steep slope that links the promontory with the rest of Mynydd Garreg.

Looking down over Llechlwyd promontory hillfort, with the Dysynni and the sea beyond

View over the Dysynni Broadwater. The valley will have had a different look to it during the Iron Age, but will have had a similar value for subsistence strategies

View across the broadwater towards Tywyn and over Cardigan Bay

View to the east

A very murky view of Craig yr Aderyn (Bird Rock), upon which another hillfort was built, to the east of Llechlwyd and Tal y Garret

A view to Bwlch hillfort to the north, with the Llyn Peninsula visible on the horizon.

There are no signs of Iron Age domestic structures hereabouts, but they will have been somewhere in the valley, visible from the hillfort, distributed at a similar frequency to modern farmsteads.  Livestock herding was probably the most practical subsistence activity, just as it is today.

At the other end of Mynydd Garreg, about 1.5km away, shown on the map above, is the hillfort Castell Mawr.  It is not visible from Tal y Garreg or Llechlwyd,  Castell Mawr has a secondary enclosure attached to it, which may have been used for corralling livestock.  If the area’s hillforts were related and friendly, it may be that Castell Mawr was used as a local livestock trading point, or as the gathering point for moving livestock further afield.  Without excavation such musings are pure speculation, particularly in view of the fact that it is not known if they were contemporary, but these are the sort of question that excavation might help to answer.  Excavation could provide insight into construction methods and artefacts, both of which could give an idea of the date of construction and the usage of the site, and would help to establish the chronological relationship between neighbouring hillforts and between these and the hillforts of other areas.

Sources:

Bowen, E.G. and Gresham, C.A. 1967.  History of Merioneth, volume 1.  From the earliest times to the Age of the Native Princes.  The Merioneth Historical and Record Society.

Gwynedd Archaeological Trust 2009.  A visitor guide to the main Iron Age hill forts of Meirionnydd.  Project No. G1770. Report No. 839

Sjöberg, K.S. 2014.  Hidden possibilities.  Possible uses of hillforts in southern Gwynedd, north-west Wales. Unpublished Masters thesis, Uppsala University, Department of archaeology and ancient history. http://www.diva-portal.org/smash/record.jsf?pid=diva2%3A799381&dswid=8151

Websites:

Archwilio
https://www.archwilio.org.uk/her/chi1/arch.html?county=Gwynedd&lang=eng

Coflein
https://www.coflein.gov.uk/

A short walk along the Dysynni broadwater, August 2020

Last week I had already walked along Tonfanau beach, but was nowhere near ready to go home on such an unexpectedly sunny day.  The BBC weather website, which I checked just before I left the house, was promising storms so I had cancelled my plans to go hillfort hunting.  Although my walk started out with most of the surrounding hilltops sitting under large clouds, they eventually cleared and the sunshine was glorious.  So instead of going back to my car, parked by the Tonfanau footbridge, I turned along the footpath that wends its way along the southern banks of the broadwater and the river Dysynni, and I am so glad I did.  By the footbridge there were a couple of families with kayaks, all having a good, peaceful time, and a little further on there was a lady with two small boys swimming between the shore and a sandbank.  One of her sons announced with great satisfaction that that the water was “as hot as a bath.”  But the further I walked, the emptier it became, and eventually it was just me and the birds.  And what a lot of birds there were!

 

Newspaper illustration of Tywyn and the railway in June 1894

On the same page in The Cardigan Bay Visitor as the Aberdovey advertising feature that I posted about the other day, was this super illustration of Tywyn showing the steam train, 30 years after the railway opened, and boats pulled up on the beach. To get a better look, click the image to enlarge it, because the details cannot be seen clearly on the small image above.

Thanks to John Pughe for letting me know that the road in the picture is Pier Road.

It is sometimes easy to lose sight of the great surrounding views when in Tywyn itself, but as the illustration shows, Tywyn is nested at the base of some very fine hills, and it really is in a super location.  A road now follows the railway on its far side, leading to the railway and foot bridges across the river Dysynni with great views over the hillsides.  Much of the  area just beyond the railway was eventually taken to build the RAF camp and airfield (that later became known as the Morfa camp), much of which still stands, although part of it was replaced with a solar energy farm.

The Cardigan Bay Visitor, 30th July 1894, courtesy of Welsh Newspapers online: https://newspapers.library.wales/view/3824070/3824072/7/

A mellow walk where the river Dysynni meets the sea – with oystercatchers

My walk last Tuesday, the only sunny day last week, took me back to Tonfanau.  Tonfanau railway station was added to the Cambrian Line to service the Tonfanau Army Camp, which opened in 1938 and was finally closed in 1973 after a 6 month stint as a refugee camp, before being demolished sometime in the 1980s or 90s.  The camp extended both sides of the railway line, reaching the beach to the west and spreading part way up a slight slope to the east.  I have posted about the camp here.  When Tonfanau was at its height as an anti-aircraft training facility, with emplacements of enormous guns along the field at the top of the beach, it would have been anything but a peaceful place to go for a stroll.  Today, however, it is probably the most quiet stretch of seaside in the Aberdovey and Tywyn areas.

The reason for the lack of human presence, other than fishermen some way out at sea in waders, is certainly because the beach is uncompromisingly uncomfortable to walk, sit or lie on.  Apart from a few isolated islands of sand or gravel, it is a pebble beach running down a shallow slope into a rocky foreshore.   Footwear is required.  This, together with the complete absence of gift shops, public toilets and ice-cream stalls, makes it undesirable for most families, and there is rarely any more than a handful of people there even at the height of the tourist season.  This makes it a very good retreat for sea birds, which line the water’s edge at a very safe distance from anyone who might be walking along the stony beach or investigating the rock pools.  Oystercatchers, terns and various types of seagull are all in evidence at this time of year.

The views along the beach are splendid.  After the recent heavy rain the Dysynni charges at high speed through a surprisingly narrow mouth into the sea, fascinating to watch, and you can see it and hear its roar on the video at the end of the post.  This understated but impressive meeting of the Dysynni with the sea is marked as Aber Dysynni (mouth of the Dysynni) on the Ordnance Survey map.  The sea itself makes a lovely sound on the rocky foreshore and gravel, drawing the gravel back as it retreats, and colliding with the rocks as it advances.  Above the sound of the sea and wind are the musical voices of sea birds.  As you walk along it, the beach curves around a long corner promising more of the same untroubled vistas over an empty beach, rolling white horses and, in the distance, the Llyn peninsula.  Behind the beach, looking east, are views of the major summits of Tonfanau and Foel Llanfendigaid, as well as the smooth green slopes of the hills between them

I started out walking along the top of the small “cliff” that runs along the top of the beach.  It is only a couple of feet wide, drops only about eight foot or so above the beach below and stops where the publicly accessible land meets the fence of a farmer’s field after about 10 minutes of walking.  It offers a terrific view down onto the beach, there are always some interesting wild flowers, and it is well worth doing if you are sure of your footing.

I then executed a controlled skid down a bit of the “cliff” that had collapsed into a sloping mound of earth, a quick way down onto the beach, and headed for the rocks.  The lush green seaweed  is glossy and lustrous, a great contrast to the darkness of the rocks in the bright sun.  The overall effect was delightful.  Water trickles through the multiple channels formed by the rocks, crossing the glistening gravel in a way that is quite unlike the sea flowing through channels in the sand at Aberdovey.

Someone has been having fun making pebble patterns in the sand and fields. Like most abstract compositions, it gives a curious sensation of something clearly created in the present taking on the character of something completely timeless.

Yellow Horned-Poppy (Glaucium flavum)

Small-spotted catshark eggcase (Scyliorhinus canicula), one of the smallest of all the mermaid’s purses.  There were two of them, one right at the top of the beach and the other in the field behind the beach.  They are so lightweight when empty that they travel on the wind.  For details on the subject of eggcases and the Shark Trust, see my earlier post.  The photos of the two eggcases have been uploaded to the Shark Trust Great Eggcase Hunt page.

I walked out onto a spur of sand to watch the oystercatchers, getting as near as I dared.  Unlike the video that I posted the other day, when what they were mainly concerned with was preening, today they were actually hunting for food and treating shells to merciless beak treatment.  Trying to get a little closer I scared them into flight, and they congregated a little distance off on a few rocks, looking very striking.

Oystercatchers at work

I’ve pulled a muscle in my shoulder, so the following video is not quite as steady as it might have been, but don’t miss out on the oystercatchers.  They are sublime.  The fast-moving water coming out of the Dysynni and churning into the sea is also truly impressive.  The Dysynni originates in Tal y Llyn lake, makes an abrupt turn northwest at Abergynolwyn and then resumes a parallel course to the Tal y Llyn valley in the neighbouring valley.  It passes the Ynysymaengwyn estate, finding its way through extensive reed beds, and emerges into the Broadwater, making its way around the low sandbanks before being funneled into the narrow channel into the sea.

Video: Oystercatchers on the beach near Tonfanau station

After walking up Tonfanau to see the Iron Age hillfort I went along the road to Tonfanau station, crossed the tracks and passed part of the old military camp to go down to the pebble beach.  It is an excellent place for watching the oyster catchers, and I was lucky to find some pottering around at the water’s edge, amongst the small rocks.  Oystercatchers are lovely to look at.  Their bright orange beak and pink legs make them stand out from any background, whilst their black and white plumage is particularly distinctive when the birds are in flight.  They make a piercing peeping sound, which can be heard here on the British Birdsongs website.  Oystercatchers feed on molluscs that the find on rocky shorelines, which they open by stabbing the sharp beak through linking muscles, and then hitting on stones and rocks to break them up, sometimes audibly.  The video below shows a pair of them on the beach at Tonfanau.  Duration:  1 minute, 33 seconds.

Due to the difficulty of walking on pebbles and the discomfort of lying on them, together with the rocky approach to the sea that challenges bare feet, there are rarely many other people there.  Whilst Aberdovey was simply packed, there were only a handful of people along that stretch of the sea, two of them fishing in waders, quite a long way out.  Walking back to the Tonfanau bridge over the Dysynni as it opens out into the sea, the path is flanked either side with verges full of wild flowers at the moment.

 

A walk to the top of Tonfanau to explore the Tal y Garreg Iron Age hillfort

Tonfanau from the southwest. Tal y Garreg is immediately above the quarry

Ordnance Survey map showing the route taken up the hill, and the location of the two hillforts, marked by red dots. These two sites are also marked on an aerial photograph below.

I have wanted to see the Tal y Garreg Iron Age hillfort at the top of Tonfanau quarry, on Mynydd Garreg (rock hill), for some time, so on Sunday (9th August) I packed my rucksack and went along the route I had scoped out on Saturday, which had been made so enjoyable by the verges filled with wild flowers.  I parked the car on the road leading up to the Tonfanau footbridge, as before and followed exactly the same route, but this time instead of stopping at the gate into the field at the end of the bridlepath, I followed the faint track of the footpath up the hill.  The route is marked in dark green on the map to the left.  There are two hillforts on Tonfanau, both of which are marked with red dots, Tal y Garreg at the summit overlooking the quarry, and Llechlwyd on a lower promontory to the east of the quarry.   On this post I will talk about Tal y Garreg, but I covered Llechlwyd on another post, and the map above and an aerial shot below show the geographical relationship between the two.  The walk up the side of the hill is very beautiful, and the views from all around the top of the hill are breathtaking.  I should, however, make a couple of health and safety notes about this walk before I recommend it as a great one to do

First, the track starts to climb fairly easily, as in the photo on the right, but as you near the top, where the bracken gives way to open ground, it becomes steep.  When you turn around to admire the view, the ground seems to drop sharply away beneath you, and falling would result in an unimpeded roll downhill.  I am very sure-footed, but instead of tacking to reduce the effort, I went straight up, leaning forward, to reduce the risk of tripping.  The views are stunning, just be careful. There are other public footpath approaches marked on the map, which might be easier.  Second, the hillfort of Tal y Gareg sits above the quarry.  Indeed, the quarry has removed a big part of the hillfort.  When you climb to the brick monument on the summit of the hillfort you are getting near to the edge of the quarry, and at the edge there is almost nothing to prevent you falling the steep drop into the quarry should you lose your footing – just fence poles with a single run of wire to mark the edge.   Perfectly okay if you’re aware of it, but do not let children loose up there.

Access over two sets of steps to the ridge at the top of the hill

The top of the hill is a ridge that extends 1.5km to the northeast, with terrific views either side.  The ridge is enclosed today by a long, winding drystone wall that extends as far as the eye can see.  A short wooden ladder on either side of the wall allows you to cross the wall easily, but take care – two of the steps on the ridge side are rotten, one completely broken.  The inside of this drystone perimeter is divided up into separate enclosures by more drystone walling, but all of them have gates or are open so you can wander freely across the top.  To the southwest is the river Dysynni, at the eastern end are views over the hills flanking the valley, including Craig yr Aderyn (Bird Rock).

I was up there partly for the views, but mainly because I am on a hillfort mission at the moment and wanted to check out what was left of one of two small Iron Age hillforts.  In the area between the Mawddach estury and the Dyfi estuary are fifteen known hillforts.  These fall into two distinct geographical groupings, a northern and southern group.  Eight of the fifteen are in the southern group and I am hoping to walk all of those that are accessible by public footpath.

When the first hillforts were excavated during the late 19th Century, it was assumed that all hillforts were defensive, and some southern hillforts certainly were, but it is by no means clear if all hillforts were built as a response to conflict.  Because so few hillforts have been excavated in northwest and mid Wales, it is impossible to establish exactly what they were designed to do, and most of them probably had multiple functions.  I’ll be talking more about the roles of hillforts in this area on a future post.

It is almost impossible to photograph a hillfort sensibly at ground level, although some banks and ditches can usually be captured.  Aerial photographs and excavation plans are the best ways of of visualizing individual hillforts.

 

Another view of the quarry. Source: Gwynedd Archaeological Trust

In fact, Tal y Garreg hillfort was very easy to spot from the ground, as the builders made use of a rise in the local topography and natural escarpments that face north.  Tal y Garreg means “end of the rock/cliff” and probably refers to the rocky ridge on which it is built. It lies at the southwest end of a 1.5km ridge at c.170m OD.   The natural lift in the land, shown on the above photograph at far right makes the hillfort highly visible from the ridge behind it.  The composite image above (click to enlarge if required) shows Tal y Garreg hillfort from the air with the 1967 site plan (upside down in terms of the photograph – Bowen and Gresham 1967) and a view of it from the middle of the ridge.  Another plan to the left offers a different view.  Today, massive piles of rock from the quarrying activity are left lying around, so it is not immediately easy to see the structural features and it helps to have the plan to hand to locate them.  There are two sets of banks and ditches, referred to as bivallate on the northeastern and southwestern sides.  The banks, or ramparts, were probably pallisaded to make it even more impressive from a distance, and to make it easier to protect if needed.  These ramparts contain an area around 45m long by 22m wide, small in hillfort terms.  Still, it was clear that although the space it contained wasn’t large, it had been built on an impressive scale.  The entrance was simple, inturned, and cut through the scarp to the north, facing the ridge.  It’s worth walking along the the edge of the drystone wall that runs behind the fort so that you can get a feel for the banks and ditches shown on the far left in the aerial photo, but be careful how near you get to the quarry edge.  One of the banks and ditches, cut into bedrock, is shown below, with the sea in the background.  Tal y Garreg overlooks the Dysynni valley rather than establishing a good line of sight with hills to the east or the coast to the north, although a short walk along the ridge on an averagely clear day provides those views.  The views have been radically changed by quarrying, but there were clearly good lines of sight across the sea, down into the Dysynni valley and back along the ridge.

Ditch at Tal y Garreg, excavated through the bedrock. Ramparts on the bank at this point would have given views over the Dysynni valley and Cardigan Bay.

The site has never been excavated, so any thoughts on its date or the number of phases involved in its construction are purely speculative.  On both plans a 10m diameter “tower” is marked, and this was a circular structure, in front of which is a rock-cut ditch now full of stone, which may be the remains of the tower, suggesting that it was quite a substantial feature.  One proposal is that the small primary bivallate hillfort may have been overlain by a smaller and later fort that made use of the earlier features, and that the tower may have been part of this later re-use, dating to a Roman or post-Roman/Early Medieval re-occupation.  In fact, there is so little evidence of Roman presence in the area that it seems rather unlikely that a Roman fort was located here, so it is more likely that any second phase was post-Roman.

The Tal y Garreg hillfort is so small that I am not sure that it really qualifies for the title “hillfort,” when compared with more massive and impressive examples, that contained a number of other structures within their ramparts.  It does, however, feature typical hillfort characteristics. It took advantage of strong strategic position that could be partially barricaded with banks and ditches on vulnerable sides, using steep sides to provide natural barriers to attack.  Like most hillforts, although not all, it is on high ground overlooking good farming land or pasture.  Although there are no known settlements in the area, farmsteads were almost certainly dotted around the landscape much as they are today, and the hillforts probably overlooked some of these in the valley.  The ridge itself may have been used for grazing livestock, just as it is today. In the photograph below, the sheep were on top of the ridge and the horses were just outside the drystone wall at the top of the approach to the ridge.

The hillfort had no water supply other than rainfall.  This small defended enclosure could not have sheltered large numbers of people against hostilities, and could not have been reached in a hurry from the valley below, so it was either designed to shelter a privileged few;  to store important resources in a relatively inaccessible location;  to segregate certain centralized activities in a single location;  to be a visible symbol of territorial tenure – or a mixture of various roles.

Located both on the edge of the Dysynni valley and on the coastal plain, lines of communication could have extended both on a north-south axis and along the Dysynni valley, past Craig yr Aderyn (Bird Rock) hillfort, and into the Tal y Llyn valley heading northwest towards the hillforts near Corwen and Ruthin.  The ridge itself would have provided a high-level route alongside the Dysynni valley for c.1.5km.  At the other end of the ridge is another hillfort, Castell Mawr, which appears to have had a large annex that could have been used as a livestock corral.

Tal y Garreg is only a short walk from Llechlwyd hillfort, which also sits on the side of Tonfanau quarry, and I will be posting about in the future.  Both are poorly understood, and it is not known if they were related to each other or were chronologically separate.  They could have been contemporary but they may have been separated by anything from years or decades to one or more centuries. Until they are excavated this relationship will not be clarified.

I wanted to see if there was a clear line of sight from Tal y Garreg to the hillforts of Llechlwyd, also at the southwestern end of the ridge at the top of Tonfanau, Craig yr Aderyn (Bird Rock) c.8km to the east and Bwlch hillfort on the next hilltop, 2km to the north, Foel Llanfendigaid.  As none of these sites have been excavated it is not known whether they were contemporary, but in the event that they were, having a clear line of sight might have had many benefits, irrespective of whether the occupants of the hillforts were friends or enemies. The nearest hillfort, Llechlwyd, is visible from Tal y Garreg, which has a view down into the much lower promontory fort.   Craig yr Aderyn is visible from Tal y Garreg, although in the distance.  If required, it would have been easy enough to set up a signal on a clear day.  Bwlch is very easily visible, and looks like the perfect location for a hillfort.  Between the two, a near-flat piece of coastal plain is divided today into fields and used for pasture.

Craig yr Aderyn (Bird Rock) c.8km from Tal y Garreg

View from Tal y Garreg to Foel Llanfendigaid, on top of which is the hillfort Bwlch

It was useful to see what could be viewed when outside the hillfort, but still along the ridge, and it was impressive how many broad views were available from the ridge beyond the hillfort, some of which are below, all overlooking good quality pasture, currently being grazed by sheep and cattle, and far into the distance in all directions including the sea.  It was a hazy day so the views weren’t quite as spectacular as they might have been, but they showed enough to indicate that Tal y Garreg was a good site for watching movements for many miles around.

View from one side of the ridge to the other, taken from the stile.

Dysynni valley, looking east

A final though on the views available from the hillfort and visibility from below is that a couple of days later I went to walk along the Dysynni from Tonfanau bridge to Ynysymaengwyn, skirting the broadwater, and found that the entire of the top of Tonfanau was under a cloud, just where Tal y Garreg was built.  It was impossible to see its location, and it would be impossible to see anything at all from the hillfort down into the valley.  This could have been a distinct disadvantage in its location!  The second hillfort, Llechlwyd, which is on the lower promontory at 70m OD, was not shrouded in cloud, so although it had no visibility of the ridge behind it, it did have the advantage of being less prone to cloud cover.

There’s a modern structure on top of the hill at this point, which is an Ordnance Survey trig pillar.  There are also the foundations of an old shipping signal.  Ordnance Survey trig pillars (or points) are part of the history of mapping in the UK.  Trig is shorthand for triangulation, and in 1936 the first of c.6500 trig pillars were built as part of the project to retriangulate Britain.  Most of them made of concrete but the Tal y Garreg trig pillar was made  of local stone, and is shown on the right.  The OS is still responsible for maintaining the pillars, of which around 6000 remain at similar locations. The project was designed to improve the accuracy of mapping, and although it has been surpassed by modern techniques and technologies, it revolutionized map-making in Britain.  Here’s an excerpt from the Ordnance Survey page on the subject of the trig pillars:

Triangulation works by determining the location of a point by measuring angles to it from known points at either end of a fixed baseline and in this case, those known points were the 6,500 + trig pillars erected across the country. In practice, a theodolite would have been secured to the top mounting plate and made level. It would then be directly over the brass bolt underneath the pillar. Angles were then measured from the pillar to other surrounding points. For the highest accuracy primary points in the retriangulation, many rounds of angles would have been measured with the observations taking several hours.

I was expecting to have the hill to myself, but there was a group of around 10 people up there enjoying the view.  We exchanged cheerful greetings, and when they left I noticed that they took the  wide quarry track that runs on a shallow incline alongside the quarry scar.  Out of curiosity I took the same route down, and it runs into the quarry yard, which is the same as the access point to the Wales Coast Path.  A farm gate opens out onto the B-road.  The quarry track is not a public footpath, but it is not barred in any way, is safe, and as the quarry is out of use it seems okay to use it.  It’s a much easier, much shallower incline than the steep path that I took up.  Although not as attractive, it gives remarkable and safe views over the quarry itself.

The quarry track

When you reach the quarry yard, you’ll find that it is a piece of industrial archaeology in its own right, with an abandoned control panel in a small building, and various bits of abandoned heavy-duty hardware lying around, plus various shallow concrete water holders, presumably for filtration purposes.  One of them had a healthy population of bullrushes growing out of it.  Gwynedd Archaeological Trust reports that the quarry was first used for extracting granite, which is unusual in this area:

The ridge has been quarried since at least the nineteenth century. A narrow-gauge link to the Cambrian Railways was put in c. 1898, superseded by a standard-gauge siding in 1906, around the time it was taken over directly by John Corbett of Ynysymaengwyn, working as Tonfanau Granite Quarries. In 1965 this became a subsidiary of Penmaenmawr and Welsh Granite Co., and operated as Kingston Minerals from 1965 to 1981. It was thereafter worked by Mr G.C. Evans of Aberllefenni.

The report goes on to say that latterly the quarry was used to exploit a sill of coarse dolerite and gabbro that is suitable for use as road surfacing material.  Here are a few snaps of the quarry as I was on my way out, but I will be going back to explore in more depth.

Sources:

Bowen, E.G. and Gresham, C.A. 1967.  History of Merioneth, volume 1.  From the earliest times to the Age of the Native Princes.  The Merioneth Historical and Record Society.

Gwynedd Archaeological Trust 2009.  A visitor guide to the main Iron Age hill forts of Meirionnydd.  Project No. G1770. Report No. 839

Sjöberg, K.S. 2014.  Hidden possibilities.  Possible uses of hillforts in southern Gwynedd, north-west Wales. Unpublished Masters thesis, Uppsala University, Department of archaeology and ancient history. http://www.diva-portal.org/smash/record.jsf?pid=diva2%3A799381&dswid=8151

Websites:

Coflein
https://www.coflein.gov.uk/

Gwynedd Archaeological Trust (no date).  Historic Landscape Characterisation: The Dysynni
http://www.heneb.co.uk/hlc/dysynni/dysynni2.html