Showing posts with label Guest Contributor. Show all posts
Showing posts with label Guest Contributor. Show all posts

Sunday, 5 February 2017

Guest Contributor – Dewi Jones


Introduction


This page heading on the Mapping Mountains site features articles from Guest Contributors, with the only stipulations being that the article has to be hill related and that I don’t end up in court through its publication!  Otherwise the choice of subject matter is down to the Guest Contributor.  For those wishing to submit an article please contact me via the email address given on the ‘About Me’ page heading.



Guest Contributor – Dewi Jones


Early Days

Over the years, when asked which was my first hill, I have tended to say Cnicht in 1950, a memorable ascent of which, more in a moment.  For when I think back, I am reminded of an earlier walk, during the summer of 1948, when our father took my brothers and I up Moelfre Isaf, (317 metres) some three miles inland from Abergele – where we lived at that time.  There even exists a couple of photographs of the event, one of the three of us striding toward the summit and one posed at the top with me sitting on the trig pillar.  They were taken with a pre-war bellows camera which leaked light so that my face is fogged out in the summit photo. 




Now we come to that ascent of Cnicht.  I was at a camp near Prenteg with the Porthmadog Scouts and a group of about ten of us decided to go up Cnicht for it is a shapely hill and a striking feature of the view of Eryri from Porthmadog.  We were walking all the way, and chose the most direct route following the Croesor tramway, a disused narrow gauge railway that had brought slates down from the slate quarries in the Croesor valley to the coast at Porthmadog.  Flat at first and then up two steep inclines to reach the village of Croesor, from there we did not choose the best of routes for we went on up the valley then climbed steep precarious scree to reach the summit ridge.  By then it was raining and our clothing would have appalled a present day hill walker, but we did reach the top and got back down again intact.  The one other incident I remember is, on setting off along the old railway a cow came trotting towards us.  We panicked!  And there was a mad scramble to get back over the gate.  However, our friend Jeremy, who lived on a farm, knew better.  He stood his ground shouted shooed it off and we came shamefacedly back over the gate and continued on our journey.

Despite the discomforts of that wet ascent something must have clicked with me for within a week I had been up Moel Ddu, a fine 1800ft hill behind our campsite where I remember witnessing a fine sunset and then, on the following weekend, over Snowdon and Lliweddd.  I was hooked. 

My parents must have been happy to encourage this new interest as a birthday present at about that time was an OS map, New Popular Edition, Sheet 107 Snowdon, Price (Cloth) Three Shillings.  I still have it, and can trace my earlier walks, for I diligently inked them in on the map, until I had to stop for the area around Porthmadog had so many lines on it, it was becoming illegible.

It seems that it was not until the beginning of 1951 that I took to doing a lot of hill walking.  Also at that time I started keeping an account of what was done – proudly called my Log Book.  Here it is recorded that, on the 3rd January, myself and two friends went up Mynydd Gorllwyn in the snow.  Had it not been written down I would not be able to recall it.  But on reading I find that we were attracted by deep snow, which was laboriously deep and drifted on the upper slopes of this 1200ft hill.  We seem to have taken a childlike delight in being able to walk unhindered over stone walls thanks to the depth of drifted snow.

Later that month I went with two older friends up Cnicht for the second time.  Taking the bus to Llanfrothen and walking the three miles up to Croesor before going over Cnicht and the adjacent Arddu, then steeply down into the Nantmor valley and up again over Moel Dyneiwyd to catch the six o’clock bus home.  It must be remembered that in the immediate post-war years not many people had cars and we were totally dependent on public transport or our bicycles to reach the hills.  As a result we rarely were able to venture further than the area to the south of Snowdon.  Clear evidence of how restricted we were can be seen on that ancient OS map mentioned earlier where virtually all the inked in lines are on the southern half of the sheet. 

Our next outing was to Moel Lefn and Moel Hebog early in February of the following year.  Memorable for long slides on our backsides on hard frozen snow, which unfortunately wore away the seat of my trousers (demoted school flannel) leaving me with an embarrassing and self-conscious walk home from the bus which we rode down from Beddgelert.

Equipment was always a problem in those days.  During the war and in the years of ‘austerity’ that followed clothing was in short supply, and indeed were rationed during the war, a system that continued until 1949, when it came to an end.  But the feeling of shortage prevailed and there was a considerable dependence on garments that were passed on from older relatives that had outgrown them.  Hence the trousers that wore out on Moel Hebog.  The one redeeming element was the availability of cheap ex-war department equipment.  I had a camouflaged anorak which lasted years and finally disintegrated on an ascent of Great Slab on Clogwyn Du’r Arddu many years later.  The Commando Rucksack was good for camping trips despite being very heavy because of its iron frame and there was a smaller sack, good for day trips.  I still have my ex WD ice axe from that time, but ex WD karabiners from that time were a disaster area (literally) for they easily twisted out of shape and were the cause of a number of accidents before their inadequacy was understood.

1951 was the year I really got going being out on the local trips maybe twice a month for finding days when like-minded friends were available could be a problem, especially as my father was a deacon in the chapel and going out on Sundays was not allowed.  One walk from April of that year, I have dramatically titled ‘My First Failure – Tryfan’.  We had cycled to Pen-y-Gwryd, but encountered hard frozen snow and blizzard conditions while crossing Cwm Tryfan.  We turned back, but I do remember a dramatic view of Tryfan as mist cleared briefly as we crossed the flat ground below Glyder Fach.  In June we completed the Snowdon Horseshoe having had a lift to Pen-y-Pass from E. G. Rowlands, an elderly gentleman from Cricieth, who later produced one of the early walking guides to Snowdonia, which might, in an updated form, still be in print.  I am ashamed to say that we left Mr Rowlands behind on the way up Crib Goch, and ended up in Nant Gwynant from where we hitch hiked home.  And so the year continued, so that by the end of it I had visited some thirty different mountains and been up Snowdon five times.

The following year continued in much the same vein, one of the more memorable outings was an ascent of Snowdon by the Rhyd Ddu path in particularly wintry conditions, where we had to resort to cutting steps on particularly hard frozen sections.  Not many photos are available of these days but my companion on that day did have a camera and there survives a shot of me cutting those steps on Bwlch Main, with the summit hotel visible in the background.



I was sixteen in 1952, and I recorded the shock of having to pay the full bus fare to Pen-y-Gwryd, three shillings and six pence!  We were bound for the Horseshoe once again, and I see that two of us kept right on to the crest of the ridge on Crib y Ddysgl, even going over the top of the trig pillar on the summit.

During the summer of 1953 I was fortunate to be able to go on an ‘expedition’ to Arctic Norway – glaciers and unclimbed peaks at the tender age of sixteen.  During the following summer I was on the Cuillin in Skye.  Then it was University at Aberystwyth, with limited opportunities for going on the hill, the same old problems, nobody had cars and very limited public transport.  By then my erstwhile companions at home had become scattered – away on apprenticeships or on national service in the Army or the Royal Navy, so that when I was at home I usually went out on my own, something that I still enjoy to this day.


List Ticking Hill Bagger

I think I have to admit to being something of a list ticking hill bagger, for one of the first things I did when I started going to the hills was make a list of the two thousand foot summits of Snowdonia in the back of an old school exercise book.  I still have it somewhere in the house.  This was soon superseded by a book called Hill Walking in Snowdonia by the aforementioned E. G. Rowlands of Cricieth.  Which listed fifty summits over two thousand feet in Snowdonia.  A book with a long publishing history, indeed it is still in print but has undoubtedly been revised many times.  It was some years before I had reached all fifty tops, not least because rock climbing rather than hill walking became my obsession, but that is another story.

Moving to live and work in Scotland in 1970 was a significant development, for as is well known Sir Hugh Munro had compiled and published his listings of the Scottish three thousands’ at the end of the nineteenth century, a new edition had appeared in 1969 and one of the first things I did was get hold of a copy.  I had already visited Scotland a few times and was immediately able to tick off twenty or so Munros in areas such as Skye, Torridon, Glencoe and the Cairngorms.  Even then I did not set out to ‘do the Munros’, but as time went by and I had worked both in the western and eastern Highlands and in 1975 I found I had done about 150 and decided to try and ‘compleat’.  It was four years later during August 1979 that I was walking down the long glen from Mount Keen, having ticked off the last one.  There is a reason why Mount Keen was saved until last.  My first Munro was Sgurr na Banachdich in Skye, which happens to be the most westerly, it seemed logical to keep the most easterly until last.  The whole process had taken twenty five years.

I did think about tackling the Corbetts, but have not got very far with them.  Indeed I consider them to be more of a challenge than the Munros, they are to be found over a wider area, and are not so easy to link together in single walks.  However, I did spend some time on the third list in the Munro’s Tables book, that is Donalds Tables of Hills in the Scottish Lowlands 2000 feet and above and got close to completing them before I moved back to live in Wales.  I cannot see myself setting off on a six hundred mile round trip to put a tick beside (for example) Bloodybush Edge, 2001 feet in the Cheviot Hills.

I did, during the 1980s, go about tackling the Welsh 2000ers, but in a rather half-hearted way.  A project that was given a particular boost by the appearance in 1989 of the Nuttall’s comprehensive list in their guide to the 2000 foot mountains of Wales, at last a clear target.  Completion of three rounds of these hills was made easier for me because at that time I had occasion to head for the Severn Bridge quite often.

The Nuttall’s book was followed three years later by Alan Dawson’s Relative Hills of Britain, an interesting concept being a list of every hill in Britain with a re-ascent of 150m from the highest land around it.  In the original list there were 149 Marilyns (as they are now known) in the Principality, and once again there was something attainable to tackle.  As with any list one is drawn to hills and parts of the country that one might not otherwise visit.  Especially as quite a number of these hills are on private (and sometimes very private!) land.  Dodging gamekeepers and thousands of young pheasants on the approach to Upper Park near Welshpool was particularly challenging.


Surveyor

The danger is that when a list if hills is compiled with precise definition of the required height and re-ascent, it becomes an open invitation to look for errors and omissions.  Sir Hugh Munro in his list of the 3000 foot hills of Scotland (first published in 1891) gloriously avoided the problem by abiding by his 3000 foot definition and avoiding a precise definition of the re-ascent, although a figure of about 500 feet seems to have been in his mind.

The revised edition of Munro’s tables that was published in 1969 includes Corbett’s list of summits over 2500 feet in Scotland – which was not published in his lifetime – and Donald’s listing of 2000 foot hills in the Southern Uplands of Scotland, both of which use a defined re-ascent.  Doubtless, over the years others have compiled lists of hills for their own interest and possibly motivation; indeed I was guilty of this myself, putting together a list of ‘Snowdonia Two-thousanders’ in the back of a school notebook.

It is not the intention here to delve into the history of hill lists although there may be a place for that at some time, but rather to recall my own small contribution to what I like to think of as bending the lists.  In 1989 John and Anne Nuttall produced the first of their two books listing and describing a way of visiting all the hills of England and Wales, defining them as summits over 2000 feet high with a re-ascent of 50 feet.

At that time I was a fairly frequent visitor to Cnicht, that shapely hill that overlooks the Glaslyn estuary to the south of Snowdon and began to wonder at the amount to be climbed to reach a subsidiary top about 400 metres north-east of the main top.  I became convinced that the re-ascent was more than 50 feet and used a crude levelling system to measure the height becoming convinced in my own mind that I was right.

Dewi with his rudimentary measuring staff, an ingenious way to measure drop

I did n0t think much more of it until on a day in late June 1996 I was descending Cribyn in the Brecon Beacons.  I was a bit behind my friends and when I caught them up they asked me did I know who we’d passed on the way down.  I did not, and when they told me John and Anne Nuttall I did a quick about turn and galloped back up the hill to speak to them.  They very kindly took note of what I said and told me they would take a look next time they were in the area.  They were as good as their word and in the second edition of the book published in 1999 Cnicht north-east top is included.  So are a number of other ‘new’ summits, for in the spring of 1997 I met Myrddyn Phillips on the top of Bwlch y Groes near Aran Fawddwy, who at that time was doing multiple rounds of the hills listed by the Nuttall’s.  Not only was he interested,  he took up the baton and ran with it and it is he, more than anyone else who is responsible for finding the extra summits that have been identified.


   


Monday, 14 November 2016

Guest Contributor – Steve Smith


Introduction

This page heading on the Mapping Mountains site features articles from Guest Contributors, with the only stipulations being that the article has to be hill related and that I don't end up in court through its publication! Otherwise the choice of subject matter is down to the Guest Contributor.  For those wishing to submit an article please contact me via the email address given on the ‘About Me’ page heading.


Guest Contributor – Steve Smith

Steve Smith - Nuttall completer



Evolution of a Hill Bagger

On 02 October 2008 I went up Simon Fell, my very first English Nuttall, before I even knew that a Nuttall existed or indeed any other hill category.

Pen-y-ghent summit one of the first Nuttalls visited on 03 October 2008, but this time on Day 07 of The Pennine Way

But that is not really where hill-bagging for me started.  That can be traced to walking the Dales Way in August of the same year.  On day 03 we were scheduled to walk along Beckermonds where the guide book suggested we should look out for Ingleborough straight ahead.  However it was Pen-y-gent on the left that caught my attention although I did not know its name at the time, and I just wondered what it would be like at the very top.  I also met up with Bob Smith, though I am sure he will not remember, from Grough Magazine.

I therefore planned a return with friends in October that year staying at The Sun Inn, Dent where we passed a couple of days later on the way to Sedbergh.  However they could only manage two or three days off work, so I set off on my own a few days early to go up both Ingleborough and Pen-y-gent.  Planning the routes also identified two other spot heights; Simon Fell & Plover Hill as well as Park Fell.  Moving on to Dent we also went up Wherneside and The Calf again picking off a few spot heights as part of the same route.

Having not done any walking other than The Dales Way surprisingly that was me hooked.  Returning home I managed to arrange another trip before Xmas and this time it was the Lake District with a couple of mates.  Two days - two spot heights; Helvelyn from Patterdale on day 01 and High Street from Mardale on day 02.  Day 01 we got as far as High Spy summit, via Birkhouse Moor before being split up as a group and driven back by the first snow of the year.  Day 02 was more successful in as much as we reached High Street via Rough Crag and also managed to pick off three other spot heights on that ridge; Rampsgill Head, High Raise and Kidsty Pike.

Finding Reg after being separated 30 mins earlier on High Spy summit as he pressed on across Striding Edge

It was not until after returning home from the Lake District I started to research the web and found the hill-bagging web site.  I also searched for “Striding Edge” and found http://www.stridingedge.net/.  Both were inspirational.  Hill-bagging introduced me to all the different hill types including Nuttalls and Striding Edge gave me the germ of the idea to document all of my walks on a blog – Peak Bagging and Long Distance Walking in the UK .

Originally the scope was to document routes to the Nuttalls, which were not readily available on the internet in those days.  During the 8 years since the first Nuttall I like to think I have progressed past the novice phase now but know I still have a lot to learn.  The purpose has now been extended to  include all hill types , be part of the extensive and growing community for hill-walkers on the web and share these experiences to:-

·         link up with likeminded people.

·         show that with common sense and not going outside of your skill-set anyone can enjoy the hills.

·         demonstrate opportunities available to extend your skill-set to enjoy the hills safely even more.

·         maybe meet up on the hill and go on walks you would not necessarily do, or are capable to do alone.

·         share routes

Turns out my very first Hill was The Roaches in June 2008 but what really appealed to me on Hill Bagging was the “My Progress” page which showed I had been up 20 hills including 15 Nuttalls, 11 Hewitts (which I initially struggled to differentiate from Nuttalls), 4 Deweys, 7 Humps and 6 of these things called Marilyns.  It was at this point I had the idea that I would target Nuttalls and resolved to return to the Lake District as soon as I could after Xmas.

Not sure when I first had the idea to go up all of the Nuttalls, sometime during the next couple of years, but with only managing four or five trips I do remember being constantly frustrated I was not managing more bagging trips.  However I suppose that was not bad living in Suffolk and working full time.  Writing up the walk reports helped as a surrogate and in all honesty it has turned out to be a record of my journey from novice hill-walker to relatively experienced hill-bagger.

Catstye Cam - English Nuttall completion (NPR) 20 April 2013 with wife, daughter-in-law (to be at the time) and walking friend John

In August 2012 I had a brain Haemorrhage.  With only 12 English Nuttalls remaining one of the things I remember thinking was I had not completed them all.  Fortunately I made a full recovery and completed (NPR) on Catstye Cam in April 2013.  What turned out to be a theme Thack Moor was promoted to Nuttall status that month and I managed to include that during the final trip.  One disappointment was the weather prevented me getting up Pillar Rock and for whatever reason I did not want that to be the last.  However that is how it turned out and after completing it in June this year I realised it was a worthy top and in some ways wish I had saved it as the final English/Welsh Nuttall.  It’s status as the final English Nuttall did not last long however as Calf Top finally achieved Nuttall status (for now anyway) resulting in me having to nip up to Cumbria from Suffolk on the way to North Wales to avoid leaving one Nuttall unclimbed.

With completion of the English Nuttalls approaching I had been considering what to do next.  In all honesty that choice was obvious.  Carry on with the Welsh Nuttalls which I then started on Chwarel y Fan in August 2013.  I was briefly distracted by the Munros in 2014 but after a serious back problem in March 2015 following a strenuous Winter Mountaineering expedition in Torridon once again started thinking I had not completed the Welsh Nuttalls.  The Shropshire Hills and other Marilyns in area 38 provided gentle rehabilitation and although I intended to complete the Nuttalls before my 60th birthday, once again I was tempted to focus on Marilyns rather than Nuttalls.  However returning above 2000’ in October 2015 on the Foel y Geifr ridge for the first time since injury provided the refocus I needed and from then I set myself the target to complete the 110 remaining Nuttalls before November 2016.

England & Wales Nuttall completion on Arenig Fach with family, friends and hill-bagging buddies 06 November 2016

2016 has been my most prolific hill bagging year culminating in me completing the Nuttalls on Arenig Fach on 06 November 2016, 8 years, 1 month and 4 days after the first.  Not a record braking pace but that is not what it is all about.  Thinking about the highlights – there were lots (and a couple of lowlights, nearly not getting off Mickle Fell).

On reflection I think the biggest highlight is the personal growth and development.  Doing something like going up a mountain for the first time on your own, learning any necessary skills to complete the challenge not to mention taking on a long term challenge the scope of which seems impossible but is clearly not with time, application, resilience and effort.

Abseiling into Jordan Gap from Pillar Rock - English Nuttall completion 22 June 2016

An obvious highlight was the recent ascent up Pillar Rock.  I always said if I need a rope I won't be going there.  Well I have needed a rope and have been there.  Think I will be doing a bit more as well.  This has been my approach throughout, not to be constrained by limitations but use them to move forwards and achieve the overall objective.

One thing for sure, after completing the Nuttalls there is not a feeling of emptiness.  Short term is to concentrate on the Munros leading on to Corbetts and Grahams in the medium term.  All of these will contribute to the long term goal of completing all 1556 GB Marilyns.

Steve Smith (November 2016)


Thursday, 31 March 2016

Guest Contributor – John Kirk


Introduction

I have approached a number of people to write articles, but if readers would like to contribute an article please contact me. The only two stipulations I make are that the article has to be hill related and that I don't end up in court through its publication! Otherwise the choice of subject matter is down to the Guest Contributor.

Guest Contributor – John Kirk


As well as being one of the most progressive of British hill listers; John Kirk has a passion for geology which is explored in this article


Geology of and Geological Divisions of Wales


Introduction

Wales punches far above its weight in the world of Geology. The science started its life in the south of England in the late seventeenth century and the proximity of Wales with an amazing diversity of rocks soon made it the formative land of this science. There are distinct areas of rocks that give different landscapes, floras, and shape of the hills, and below is a rough and simplified guide.
 

Rock Types


There are three basic forms of rock.


1.      Igneous Rocks
These are rocks formed inside the earth and find their way to the surface, one way or another.

If one imagines that the Earth’s crust is like the skin on a pan of two day old custard, a reheat of the custard, without stirring, will result in events akin to these processes. Where the material bursts forth and ejects material from underneath, as a volcano, the ejected material, either as a hot flow of liquid or as a cloud of hot rock and ash will build on the surface of the Earth in the area. The way this material is deposited and the rate at which it cools will determine the shape of the crystals in the rock and what names a geologist will apply to it.  A second and more lasting form is where the material rises up inside the Earth as a hot blister of rock, like in a 1960’s lava lamp, but never actually breaks the surface. The hot blob, called either pluton or a batholith by Geologists, cools and hardens as a rock called Granite. This generally cooled slowly to form a very hard rock with big crystals. It can, on occasions, be a friable granular rock instead. The current day mountains are the eroded remains of an uplifted plain, which exposes the tops of quite a few of these features. These are a common form of British mountain today. These rocks are the easiest to date by radioactive decay. Once the magma set, the radioactive clock started ticking.
   

2.    Sedimentary Rocks
These are rocks that form as sediments, usually in a sea. As mountains wear down, the dust and pebbles find their way by the forces of erosion to the sea. These materials, along with the fossils of the creatures of the era, form layers and pile up. The layering is usually obvious in the rock and is called bedding. These form horizontally but the forces in the earth have pushed them to be at all sorts of angles, but in most sedimentary layers they are usually not far from level. There is evidence in Britain of past sedimentation layers building up to 6,000 metres thick in some cases. This stuff, under modest pressure and chemical action, is reformed as rock; ready for the next time the Earth folds them up as another mountain range. Sedimentation is not an even process. If a particular spot on the Earth is eroding away, it is a supplier of material to sediment somewhere else, and will miss out on the rock formation of that era. There can be hundreds of million years of a gap between sediments in a particular location. In this rock type, the rock can be dated radioactively from the fossils.
 

3.    Metamorphic Rocks
These are sedimentary rocks that have been altered by being cooked. Rocks deep in the Earth, adjacent to volcanoes or plutons, or, alternatively, they receive incredible pressure in the process of mountain building and can be heated up to almost the point of melting. This changes their nature and they become crystalline. They retain the bands or layers associated with sedimentation, but are often contorted out of shape by the pressures to which they were subjected. These vary considerably depending upon the type of original rock, the heat of the cooking process and the degree of deformation to which they were subjected. These are the most difficult to date using radioactive processes.

 

The Age of the Rocks


The early geologists categorised rocks by the fossils embedded in the rocks. The initial bands were called Primary, those rocks of such an age that there were no fossils present, Secondary, with fossils of creatures that are quite alien to life today, and Tertiary, with recognisable fossils. There is also a quaternary division for the rocks of the last couple of million years.

The above broad divisions are now called Geological Eras. These sub-divide into Geological Periods, and set out below are the main periods, time-scales and a description of the rocks formed at that time. All the earliest periods have Welsh related names and are a must for Welsh people to remember. Some of these names are used in the notes, and this table will need to be referred to in following some of the detail.


Geological Period
Rock types and distribution 
Pre Cambrian
Before 600 MY


Fossil free primary rock, like The gneiss rocks of north west Scotland from 1600 to as much as 2900 MY old. The Moine schist rocks are 1500 to 1025 MY old and Torridonian rocks are from 800 to 1000 MY. Further South, the Long Mynd and the Malvern Hills near Worcester are Pre Cambrian.  This age of rock probably underlies all rocks in the UK but usually at substantial depths. As the earth crust thickens in some areas, the Pre-Cambrian will be melted and recycled.  
Cambrian
600 to 500 MY
Named as these were first identified in North Wales, These are the earliest fossil baring secondary rocks. They form the Harlech peaks of North Wales, the base rock of Anglesey and the quartz caps on mountains in the far north west of Scotland. A thin strip of Cambrian rock also forms Stiperstones in Shropshire. The rocks of this age are generally absent in other areas.    
Ordovician
500 to 440 MY
Named after a Welsh tribe, the Ordovices, These rocks are found in a large part of Central Wales, the Lake District, Southern Scotland and Eastern Ireland. These rocks contain the earliest fossil fish, and consist of dark coloured shales, grits and sandstones. 
Silurian
440 to 395 MY
This 45 Million year period is named after another Welsh Tribe, the Silures, and the rock occurs in a large part of Central Wales, much of Southern Scotland, the Southern Lake District and The Howgill Fells. These rocks contain fossils of the earliest land animals and the early Ammonites. This period was at the start of the Caledonian Orogeny with mountain building rather than deposition further north.   
Devonian
395 – 345 MY
Found originally in Devon, hence the name, and much of the English West Midlands and is the signature rock of South Wales. This is old sandstone with comparatively few fossils. At the time these rocks were laid down, Britain was in the region of 30 degrees south of the equator, a desert zone.
Carboniferous
345 – 280 MY
This was the period that Britain passed through equatorial regions, and the Caledonian Orogeny came to a close. Land areas had lush forests that eventually formed coal seams. There were shallow seas that teamed with life to lay down much limestone and at times, the central area of England was part of the delta of a great river depositing the material for millstone grit. The late Carboniferous was also the time of the Hercynian Orogeny as mountains were built to the south and in the South Wales Valleys area.
Permian
280 – 225 MY
This is named after the Perm district of Russia and rocks of this age are not well represented on our mountains. The exception is the Clwydian Range.  
Triassic
225 – 190 MY
Named in Germany where it has three distinct beds, this period is again poorly represented in Britain, the exception again is the Clwydian Range.  
Jurassic
190 – 136 MY
Named after the French mountains of Jura, this type of rock is not represented in our mountainous areas. It is present in Eastern and Southern England
Cretaceous
136 – 65 MY
This comes from the Latin word for chalk, and the extensive chalk and weald areas of South East England are of this age.
Tertiary
65 – 2 MY
There are a variety of different recent sedimentary rocks, but these do not form Mountains. The Tertiary Volcanoes of Western Scotland were formed about 60 MY ago at the time of the opening of the Atlantic Ocean.

 

 

Wales – The Story of the rocks.


We will start the story of Wales some 600 million years ago. At this time the area of the earth that would become Wales was located on the margins of a small continent now called Avalonia. This land was located somewhere south of the present South Africa and heading north, inexorably at a few inches a year. It is still going north at about the same speed.

At about this time all the continents of this early earth were in the process of forming up as one super continent which is called Pangaea by the Geologists. In this process, Avalonia was closing on another early continent to its north. This continent, of much older rocks, named Laurentia, which is now largely Eastern Canada and Greenland, also had on board land that would one day be a part of Northern Ireland and the Highlands of Scotland. The coming together of these two continental masses would take a process of some 130 million years, and form a mountain range of Himalayan scale that would extend from present day Scandinavia across Scotland and form the Appallachion Mountains of the eastern USA.  This process of mountain building was the Caledonian Orogeny. The mountain building process was slow, and one can only speculate on how high the mountains got as the forces of erosion were at work from the moment the first peak put a nose out of the sea. The line of the continental “join” is now called the Highland line, which extends from the just south of Aberdeen at its north eastern end, across the southern highlands and Northern Ireland. The line crosses southern Loch Lomond along a chain of islands. The rocks on each side are completely different from each other. The angle of contact between the continents has set the “grain” of the highlands with a series of parallel rock groups across the north, that today form parallel ranges and valleys.

In the continental coming together, the tough little continent of Avalonia took much less of a hit.  The Southern Uplands of Scotland and much of Central Wales were bucked up and a line of volcanic plumes burst forth with the pressures. These extended from The Cheviot in the North East and included The Lake District, North Wales and the Wicklow Mountains in Ireland. In this process the Harlech Dome was the centre of a large uplift surrounded by very contorted metamorphic rocks and small volcanic vents. These form the basic blocks of today’s mountains.

The area of Wales was in for another big continental coming together around 300 million years ago forming a further set of mountains in what is called the Hercynian Orogeny. This event buckled up the existing Devonian Sandstone in South Wales and Southern Ireland to form two parallel sandstone ridges, and set off the string of plumes of molten rock in the south west of England that cooled without breaking the surface, the largest of which is now Dartmoor. In the Devonian period Wales was about 30 degrees south of the equator and in a desert region. By the period of the Hercynian the country was now at the equator on its epic journey north. On land that would one day become South Wales, tropical forests grew and these would eventually form coal.

All of these mountain ranges were doomed to the forces of erosion over the abyss of time. By 200 million years ago, the great Caledonian peaks had been reduced to a rolling plain and the Super-Continent of Pangaea was starting to break up. Great forces were at play, tearing the land apart. Over a period of 100 million years, the line that now is Scotland’s Great Glen saw the northern section of Scotland pushed 65 miles south west. Rifts and faulting saw the central valley of Scotland sink with much matching volcanic activity and the area of North Wales was uplifted along the line of the Bala fault.

Only 30 million years ago, that which is now Wales was a level plain on the margins of the new European continent. If one compares the age of the earth to the height of current day Snowdon, 30 Million years can be compared to only the topmost six metres. This is only a comparatively short period in geological time and almost at the end of the story. We know that the rocks of which our mountains are made are a lot older than that, so what happened? 

It was at this time, 30 million years ago that another mountain building process started. Africa was moving in on southern Europe and the Alps were about to be formed. This process took the first 10 of the last 30 million years, and, as a by-product, it resulted in the western margins of Europe being raised, almost as a block by up to two kilometres. There was some buckling, the Pennines were gently folded upwards, and the chalk ridges in the south east of England were uplifted. The north and west were uplifted most.

Almost immediately the forces of erosion started to work. This is a process of attrition, the sun shines on the rocks by day expanding the material, they cool again at night, the rain will remove any loosened debris, the wind will sandblast the surface, ice will form in cracks, and gravity will always win in the end. Soon the uplifted block started to wear. What became our mountains were not necessarily rocks that were the roots of former mountains of ages lost, but the harder bits. Soft stuff wears away faster than the hard.

The story is complicated in detail, there was later “down warping” of the western margins of Europe. This lost some material to the continental shelf and created the North Sea Basin. In broad principle, however, our mountains had arrived. The last million years has seen the greatest amount of sculpture taking place with four major ice ages. Ice over-deepened valleys, cut out the cwms, created hollows for llyns and created our landscape.

So, our mountains today are not the eroded stumps of mountains of ages past, they are the eroded roots. Not like a worn car tyre, but more of a worn re-cut re-tread!

We, as human beings, occupy a different timescale to the mountains. For us, time is just now. As far as the mountains are concerned, a human lifetime is a flash, less than the thickness of the whitewash on top of the ordnance column on the Snowdon measure of time. We see the mountains as unchanging, but their story is excitingly dynamic within their frame of time.

   

The Geological divisions of Wales.

Wales falls into a number of uniquely identifiable areas based upon geology.


Anglesey and the Lleyn Peninsula

The geology of Anglesey is one of the most complex in Wales and is a series of rock types crushed on lines parallel to the Highland Boundary Fault. The land was uplifted substantially in the Caledonian Orogeny to expose the basal layers. It would be a mountainous land if it were not for the action of sea ice making its way south in the last number of ice ages. The two kilometre thick ice had the effect to planate the land almost level. Just the unusual and complex geology testifies to its origin.

A line of long extinct Caledonian Orogeny volcanoes provide a backbone for the Lleyn peninsula to project into the Irish Sea. These provided resistance to the sea ice of the recent ice ages, but the ice in turn has created the landscape of the hard volcanic plugs sculptured into steep little cones. The rock types are similar to Anglesey and the boundary is almost a straight line heading SSW from Bangor to Criccieth.


The Great Dome – Snowdonia. 

The Geological Harlech Dome of Cambrian rock is centred on the Rhinogs. The dome of Cambrian rock with some granite intrusions is about 30 km in diameter and consists of the Rhinogs and the western tops of the Arenigs. The area is then circled by the very complex rocks of Ordovician age including various volcanic rocks, ash based mudstones and slates with more granite intrusions. The surrounding arc is up to 20 km wide, but is absent on the Cardigan Bay side, probably due to ice planation. It looks like there was a sufficient mass of mountains to stop the sea ice at Penmaenmawr. Once the Conway Valley was full of ice, its progress southwards here was stopped. The incomplete Outer Ring has the following boundaries:-

West –a line from Bangor to Criccieth.

East – a line along the Conwy valley to Pentrefoelas and then ESE to Corwen

South – Along the line of the Bala Fault SW from Corwen via Bala to Tal y Llyn and the sea at Tywyn. 

   

The Denbigh Moors

This highland is composed of Silurian rocks and surrounded by carboniferous limestone that probably formed over all the area but is now stripped by the forces of erosion from the higher lands. There are no igneous intrusions. The area lies east of the line from Conwy via Pentrefoelas to Corwen as set out above, and west of the line of the River Clwyd.


The Clwydian Ridge

This ridge is geologically special, the 225 MY old rocks are from the Permian / Triassic periods and the main representation of this age of rocks in British hills. There are some lowland examples in the Cheshire gap and east of the Pennines. The boundary is the River Clwyd throughout its length, and The Bala Fault east to the English Border.


Mid Wales

By far the largest geological area of Wales, The northern boundary is the line of the Bala Fault all the way from the English border at Pulford north of Wrexham SW to Corwen, via Bala to Tal y Llyn and the sea at Tywyn. The southern border is a line, almost parallel to the Bala Fault from Knighton, SW to Crossgates, SSW to Builth Wells then a line SW along the lines of the Rivers Irfon, Afon Bran and the Towy to the sea at Carmarthen. A South Western Border is a line from Carmarthen to Newport on the Cardigan Bay Coast.   

This large area is predominantly Silurian with some older Ordovician rocks (Plynlimon) showing through. Compared to most of Wales the area has relatively undisturbed rock with gentle folding. There are a few odd exceptions. The Berwyn range has a number of very hard Rhyolite dykes and intrusions that produce an odd result. Besides them being hard enough to ensure the survival of quite high hills that should have been worn down, They also create the highest waterfall in Wales and create “wrong sided” hills. Normally the south side of a hill ridge is smooth as the sun stops glaciers developing. On a normal ridge, such as the Glyders or Nantle, the south side is relatively smooth, the north dramatic. The Berwyn demonstrates a rocky crag of rhyolite facing south and a smooth grassy north side.

In the east of the area within sniffing distance of the English Border are some volcanic plugs, West of Oswestry, Moel y Golfa near Welshpool and Corndon Hill. Just east of Corndon Hill into England are some very unusual exposures of ancient rocks at The Long Mynd and Stiperstones. 
   

 West Wales

This area is all south and west of a line from Carmarthen to Newport on the Cardigan Bay coast. After the large areas of dull Silurian mudstones of Mid Wales, this little area is an action packed very diverse area with the stumps of some ancient volcanoes and swarms of dykes of igneous rocks, one of the more famed is the intrusion of Andesitic lava that provided blue stones for Stonehenge. The area has two east – west orientated ridges of Devonian Sandstone, a continuance of the South Wales formation. These two ridges can be traced across the sea and across southern Ireland where they form Ireland’s highest mountains. The projecting sandstone ridges form the jaws of St. Bride’s Bay. 


Sandstone South Wales
 
This is another large patch of Wales and represents the area of Old Red Sandstones of the Devonian Period. The northern border is the line set out above from Knighton to Carmarthen and is bounded on the east by the English Border to the sea. The only exclusion is the next and final area, The Valleys of South Wales.

The sandstone area has several distinct areas formed by the angle of bedding of the sandstone. The rock is fairly level in the Eastern Black Mountains and Radnor Groups, but has a dip and scarp formation further west, the northern block of Mynydd Eppynt with a steep scarp towards the northern boundary of the area and a long dip slope to the south, and the matching structurally but far superior landscape value of the great sandstone wave that crosses the area of the Brecon Beacons, Fforest Fawr and Carmarthen Fan.


The Valleys of South Wales

Last and probably least of the Welsh Geological Areas is the Carboniferous area known as the valleys of South Wales. This is an area where rocks of Carboniferous age have been laid down on top of the underlying Devonian Sandstones, and is the best example in Britain of river course imprinting. The rocks were formed when Wales was on its long journey north in the tropics, and was a rich shallow sea when the limestone was formed, and when out of the sea, the tropical forest produced the coal measures. Later the area was part of the “Proto-Rhine” delta, and much mudstone developed. All was laid down level, but was raised in the last 30 million years with the formation of the Alps. As the land rose, rivers in place maintained their courses, resulting in a set of very deep valleys. The Boundary is a bit of an oval shape, From Kidwell south of Carmarthen, heading NE parallel to the Sandstone border until the hills develop. The line then continues about 10 km south of the crest of the Great Sandstone Wave to Blaenavon and then SW to Cardiff.


John Kirk