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ON the ROCKS Newsletter of the Yorkshire Branch of the Open University Geological Society September 2018

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ON the ROCKS Newsletter of the Yorkshire Branch of the Open University Geological Society September 2018 ON THE ROCKS Newsletter of the Yorkshire Branch of the Open University Geological Society September 2018 The Honister Slate Mine – starting point for the field trip described on page 12 Branch Organiser’s Musings CONTENTS 1. Rick’s musings Welcome to the third newsletter of the year. So far, we have had five absolutely 2. Tina in Norway amazing field trips, and have now been to Ingleton, Knaresborough, Bowland, 4. AGM Date 5. Castleton field trip Castleton and Settle. Over the next few newsletters you will see many of the write 10. Free beer in Spain ups for these trips. 12. Blencathra – day 4 16. Editor’s piece In the last newsletter both and Ann and myself spoke of the need to charge a small 16. Field trips etc fee of £2 for each field trip. So far this year we have collected in £104.10. This, to be honest, confuses me as someone has given me 10p extra, do we treat it as a charitable donation? Or would you like a refund? Either way the £104.00 will be a valuable contribution to help run the branch. Our next trip is to Norber and Crummackdale, which was the first trip I ever attended with the OUGS. It rained torrentially all day during which I can remember both Geoff and Peter using lots of new words none of which I understood! I had to ask what a syncline was, anticline, erratic and unconformity, the list was endless, but it will always hold a special place in my heart. The forthcoming trip in September will be self-led and follow the walk based on the Ramblings of Alan Stollery. continued overleaf….. [Type here] The Yorkshire Branch of the OUGS September 2018 From this last local trip until next year it is a bit quiet, so I am trying to arrange a possible indoor trip to the Hull area in mid-November. I’ll let you have details when I have arranged it. Although Blencathra 2018 was fully booked we have had a cancellation so there is one last space remaining if anyone is interested. I have recently made the decision that this year’s Blencathra will be the last, but I believe running the trip has given me the confidence to organise trips further afield. Next year, we will still be in the Lakes, but we will be learning how to complete independent mapping, which is one of the most important skills a geologist can have. We will be based at YMCA Lakeside and our mapping area will be around the area of Coniston, and our leader will be Dr Simon Drake of Birkbeck. Why not look on our website for details of the Mapping in the Lake trip. Can I remind all members to keep their details up to date and to keep the membership secretary informed of any changes? Can I also remind you that we also have a Facebook group and are also on Twitter. @openunigeolsoc & @YorkshireOUGS Best wishes Ricky Savage Yorkshire OUGS Branch Organiser 07761 409807 Quest for the crinkly edges - Norway 2018 Several years ago, when on a Fossil Festival weekend walk at Staithes, I found an interesting bluish sparkling rock (Fig. 1) that was clearly not local. A fellow walker asked if I knew what it was. He explained it was a nice piece of Norwegian larvikite, an igneous stone with feldspar crystals which is more attractive when found in situ before any weathering or erosion has taken place (Fig. 2). I learned these stones could have arrived here in several ways, including glacial transport or less interestingly as ship ballast or for local Whitby sea defences, but my stone seemed far too well rounded to simply be a fragment of local sea wall. Fig. 2 A clean-surface larvikite specimen Fig. 1 My original larvikite rock More recently on an East Midlands OUGS trip we visited some of the local glacial-formed geology. Seeing moraines, till, and preserved bogs started a story in my head... a journey connecting how the ice carved both sides of the North Sea. I learned that my rock may have arrived via another means of transport: first carried by icebergs and then later picked up from the sea floor by glacier. What started with the larvikite became an art and geology-inspired trip to Norway to sort of 'trace' the journey. 2 The Yorkshire Branch of the OUGS September 2018 With a photography student in tow, I went searching for geology on a Hurtigruten cruise from Bergen to Kirkenes in December. I prepared for the trip by reading "The Making of a Land: Geology of Norway" by Ivar B. Ramberg, which I highly recommend. Onboard, the ship’s ‘expedition team’ staff were always helpful and though they weren’t geology experts they gave talks in English each day about local topics including some geology in layman’s terms. They even had a copy of "The Making of a Land." Perfect! Though the light and weather (blizzards!) were against us at this time of year, observing structural geology and simply finding rocks to take home were my main goals. Plus, there was plenty of time onboard to read up on topics and view passing landscapes from the open decks, not to mention sketching in the warm lounge. Once at sea, even in the 'blue light', or civil twilight, north of the Arctic Circle it's easy to observe large scale features (Fig. 3). Being unfamiliar and half-hidden in snow, the details unfortunately eluded me, so I focused on sketching the wider field of view and then hunting for actual rock samples. Each time I went ashore on an excursion I'd look for an accessible area of rock to find a surface and take close up photos. Asking excursion leaders about local geology usually resulted in answers like "it's regular rock", so I carried on doing my own research on the ship afterwards. For samples to take home, finding pieces of rock in situ was a priority, though loose rocks I could clearly link to in situ were the next option. Fig. 3 Civil twilight (“blue light”) Fig. 4 A coastal U-shaped valley Early on I realised that a nice clean surface could be found by peeling away heavy moss on large rocks that had trees on them - like one from an outcrop west of Flesnes on the Lofoten islands Fig. 2). After rocks the next quest was spotting U-shaped valleys, and the coast did not disappoint (Fig. 4). As an artist the "big picture" viewpoint from out on the water was ideal. Along with plenty of coastal U’s around Bodø and Trondheim a few unexpected observations emerged. Some areas had what appeared to be incline/syncline curves, some peaks showed lee and stoss side patterns, and there were even odd flat horizontal beddings - or so I thought I saw in the snow. With snow sitting on superficial structures, I questioned exactly what it was I was really seeing. I felt like a student again and jotted down my ideas in my sketchbook (Fig. 5). Back in the studio after the trip I returned to the big book to check it out. While I couldn't confirm specific outcrops with incline curves, the areas were metamorphic so that hypothesis wasn't out of the question. The lee and stoss patterns also made some sense since much of the top structure of the mountains has been formed by wind, erosion, avalanches and falls (mud or snow). But the horizontal patterns remained a mystery. The best explanation I can find, if they were true structures and not just superficial, is that meltwater created progressive isomasses - new rising or falling shorelines of glacial lakes. 3 The Yorkshire Branch of the OUGS September 2018 Fig. 5 Sketchbook notes In the end I brought home a full sketchbook and a wonderful collection of hand samples: whole piece of quartz vein from the top of Bergen, schist surfaces, marble from Bergtatt mine, granites, gneiss from the famous Ocean Road (Fig. 6), and the find of the trip a piece of limestone from WWII excavated caves at Brønnøysund (Fig. 7). Fig. 6 A fine specimen of gneiss from Ocean Road Fig. 7 Limestone for caves at Brønnøysund At the end of a great trip I'd trained the crew to give me the same patient yet glazed look my friends have when I excitedly show them random rocks. I even cheated and found some eclogite and a great samples box at a lovely little rock shop called Living Stone in Brygge (Bergen). All in all, I learned a lot even from a non-geology-based trip. Report and all photos by Tina Mammoser The AGM date for your diary The AGM, incorporating a day of talks, will be held at 10.30am on Saturday 26th January 2019 at the Swarthmore Education Centre, 2-7 Woodhouse Square, Leeds, LS3 1AD. Entry to the AGM and the first lecture is free, but to cover the afternoon speakers’ expenses a small charge will be made. It is anticipated the last talk will finish at approximately 3.45pm, and full details of the day will be given in the next newsletter. 4 The Yorkshire Branch of the OUGS September 2018 Field trip to Castleton on 9th June 2018 The field study day, led by Paul Hildreth, was attended by six members who met at 10.30 in the Peak District National Park at Castleton on a warm and sunny late Spring day. Geology overview Castleton sits in a dramatic landscape in an area of classical geology where Carboniferous stratigraphy dominates.
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