One of Alan Stollery's Ramblings
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ON THE ROCKS Newsletter of the Yorkshire Branch of the Open University Geological Society December 2020 A view of Whitby looking south-east. On the clifftop is St Mary’s Church and its graveyard where Dracula used to lurk - the ruins of Whitby Abbey are behind it. The reddish sandstones towards the top of the cliff are Middle Jurassic and they overlie highly fossiliferous Lower Jurassic, which can be inspected by walking round the toe of the promontory at low-mid tide. Peter Vallely. Editor’s piece Welcome to the latest newsletter which I hope you enjoy reading. I have tried to put together a mix of items including Peter Bratt’s visit to CONTENTS Iceland, Paul Worral’s look for fossils in Westphalian Rock in Sheffield, 1.Editor’s piece an extract from Allan Stollery’s Ramblings and a geologically-themed 2.Sue Vernon’s message poem by Beth Peart. 2.Virtual field trips 3.Þríhnúkagígur volcano On page 9 there is an important letter from the Executive committee 4.Beth’s poem regarding the future of the Branch. The Branch AGM, which you will 5.Branch AGM Agenda see from the agenda on page 5, will be held virtually via Zoom on 6.Finding fossils from the Westphalian in Sheffield Saturday 23rd January during which a discussion and vote will take 9.Important Branch Notice place on the future of Yorkshire Branch. I hope you are able to join us. 10.Rambling with Alan Please note that the closing date for registering your interest in Stollery th attending is 20 January. After the AGM there will be a virtual talk. 13.Membership renewal Stay safe, and hopefully we’ll all be meeting up again sometime in 2021. The Yorkshire Branch of the OUGS December 2020 Message from Branch Organiser Sue Vernon Dear Yorkshire Members I hope you are all well and finding things to do. All OUGS events have either been postponed or cancelled until next year a frustrating time for us all. This decision was not made lightly and considering the Governments intervention of a lockdown in England along with those of the devolved nations we feel that this was the right decision. Although we are in a lockdown situation this does not mean there is nothing going on, on the contrary many of the OUGS Branches have embraced the new technology and now putting on talks and virtual field trips via Zoom. Please check the OUGS website Events list for further information. The virtual AGM took place as scheduled in October, and you should have received a report on the AGM via the recent Bulletin. At the recent EC meeting the decision was taken to hold AGM 2021 as a virtual meeting via Zoom on the 17 April 2021. Therefore, if you booked to go to Glasgow you should receive a full refund from the Society Treasurer. Unfortunately, due to current situation regarding the pandemic the EC took the decision to cancel the Lancaster Symposium. The Society has a duty of care to its members and it was felt that this was the best way to guarantee their safety in the present circumstances. Symposium 2022 is now in the planning stage and we hope that by that time we will have returned to a more normal way of life. The Branch AGM will be a virtual event via Zoom, and the agenda and registration instructions are given on page 5. Stay safe. Sue Vernon Virtual field trips You will have read in the recent OUGS bulletin that because of ongoing Covid restrictions all OUGS field trips are still postponed until further notice, and while the recent announcement of a vaccine is welcome news, it may still be some time before we’re all able to meet up again for organised trips. In the meantime there are several organisations and associations who have arranged virtual field trips, with many of them being recorded and available to watch on You Tube. And don’t forget the free courses on OpenLearn offered by the OU. The various links are: The Geologist’s Association https://geologistsassociation.org.uk/sofageology/ British Geological Survey https://www.youtube.com/channel/UC0JCbQti3FlTIzrJGZqzh3Q Yorkshire Geological Society https://www.yorksgeolsoc.org.uk/events Manchester geological Association http://www.mangeolassoc.org.uk/onlineevents.php Cardiff University https://www.cardiff.ac.uk/earth-ocean-sciences/events Leeds Geological Association http://www.leedsga.org.uk/ The OU – free courses on OpenLearn https://www.open.edu/openlearn/free-courses/full-catalogue 2 The Yorkshire Branch of the OUGS December 2020 My visit to Þríhnúkagígur Volcano Location: About 20km SE of Reykjavik, Iceland 63.998408°N, -21.698931°E Þríhnúkagígur (in English pronounced Thrihnukagigur, and translated as Three Peaks Crater) is a dormant volcano in the Bláfjöll Country Park, relatively near to Þingvellir National Park. As such it lies in a rift valley, the Reykjanes Ridge segment of the MidAtlantic Ridge, on the divergent boundary between the Eurasian Plate and the North American Plate. Figure 1. The lava plain of Bláfjöll Country Park with the three Figure 2. Approaching the crater above the chamber craters of Thrihnukagigur in the distance. The volcano has three craters, each just 50m or so higher than the surrounding lava plain (fig 1). The smallest, north-easterly cone is significant in that it has a small opening at top. The chamber beneath this opening was first explored in 1974 by Árni B. Stefánsson, a doctor in Reykjavík and a lifelong cave enthusiast. After years of lobbying, limited access for visitors was granted in 2012, with strict environmental conditions. The company that runs the tours tends to use the term “magma chamber” but, being so close to the surface, this is unlikely to be the case. Using the sponge analogy, this is better thought of as a space created by pooled magma before it reached the surface. Although such pools would normally cool and solidify at the end of an event, it is thought that in this case the magma “retreated” somewhat, leaving the space empty. Figure 3. Above a 120 m deep chamber, how much do you Figure 4. Just 15m into the descent, and the cage emerges trust temporary engineering? It is worth noting that the guys from the entrance “funnel” into the chamber itself who built it also operate it 3 The Yorkshire Branch of the OUGS December 2020 The chamber is about 120m deep and about 50 x 70 m at the base. Lava tubes may lead down some 200m or more. The tour starts with a 3.5km hike across the lava plain - strong boots required! (fig. 2). After receiving helmets, headlights, harnesses, etc, visitors have the treat/worry of being lowered in a cable lift (figs 3 & 4). Visitors are allowed 30 minutes at the bottom of the chamber. At the time of my visit we were not allowed to get too close to the walls or to remove any samples(!), so no closeup shots - sorry. Dr Peter Bratt A geological poem by Beth Peart “Limestone-Timestone" Land falls, dissolves and disappears Into the all-embracing sea With long, planetary spans of time She Quietly collects the shelly souls Of her delicately fallen creatures And makes Land Anew A possible addition to your Christmas present “wish list” For my birthday early into the first lockdown my wife bought me FReNeTiC which is a word game based on the elements. It is described as “a fast-paced word race which combines skill, luck and strategy where the atomic numbers become your points”. To start the game eight tiles are placed face-up on the board in their position on the Periodic Table. Players then have 45 seconds to make as many words as they can from those tiles in the order they appear on the board. It’s an interesting variation on Scrabble and a game that everyone joins in at the same time. 4 The Yorkshire Branch of the OUGS December 2020 Open University Geological Society Yorkshire Branch AGM Saturday 23rd January 2021 to be held at 10.30am By Zoom digital meeting software Members wishing to participate must register with the newsletter editor [email protected] by Wednesday 20th January Agenda 1. Welcome 2. Apologies 3. Minutes of the last meeting held on 25th January 2020. These appeared in the March 2020 Newsletter. This can be seen by logging into the Members section on the YOUGS website here then continuing to the Members Information Pages 4. Matters arising from those minutes 5. Correspondence 6. Officers’ reports; Branch Organiser, Treasurer, Newsletter Editor 7. Discussion and vote on the future of the Branch 8. Election of Officers; Branch Organiser, Treasurer, Newsletter Editor (if applicable) 9. Alan Stollery update 10. Any Other Business 11. Date, time and venue of next meeting (if applicable) Please note: for on-line voting on the future of the Branch and for election/re-election of officers (if applicable), only ONE vote can be cast per device. Following the AGM there will be a virtual talk given by Bill Fraser who some of you may remember has led a number of YOUGS field trips in the past. The subject is Rock for Ribblehead - The rocks used in the construction of the viaduct and where they came from. This has been in the news recently because of the current maintenance work being carried out on it. 5 The Yorkshire Branch of the OUGS December 2020 Looking for Fossils in Westphalian (Coal Measures) Rock The lockdown has meant the postponement or cancellation of many of the normal OU and associated Field Studies which has led to myself and others looking much closer to home for our ‘Geology Fix’.