Click here to read this mailing online.

Your email updates, powered by FeedBlitz

Here is a sample subscription for you. Click here to start your FREE subscription

"Geology in the West Country" - 5 new articles

  1. Field trip to Anglesey, May 2016 - Lecture December 3rd 2015
  2. Mystery object found on the Bath GS Manor Farm trip
  3. Good lectures - October 1st and October 7th
  4. New duck-billed, plant eating dinosaur
  5. Homo naledi, a new species of human, discovered in a cave in South Africa
  6. More Recent Articles
  7. Search Geology in the West Country
  8. Prior Mailing Archive

Field trip to Anglesey, May 2016 - Lecture December 3rd 2015

Bath Geological Society
Field trip to Anglesey, Cemaes Bay in north Anglesey
27th to 30th May 2016
Dave Green, Geostudies
The course will start at 7.30 pm on 27th and is based at the Harbour Hotel in Cemaes Bay. The course ends at lunch time on 30th May near the Menai Straits bridge, but details will be given of other sites to visit for those who wish to stay on.
The cost for tuition is £40 of which only £20 is refundable.
Transport is by private car to the location. Sharing is advisable during the course due to narrow roads. Book your own accommodation, but if you do not stay at the Harbour Hotel, please be nearby and be prepared to eat the evening meal there, to enable discussion in the evening session.

3rd December this year, Dave Green is giving a talk on the complex and controversial geology of Anglesey. 
Firm expressions of interest are requested after that date, with payment shortly after (cheques to Bath Geological Society). There is a maximum of 20 places on the course.
Further details from the secretary.


Mystery object found on the Bath GS Manor Farm trip

The object above was found at Borrow Pit, Manor Farm, Aust - a Triassic mystery.  An expert's opinion is as follows:-
"My interpretation of this is that it lacks the symmetry and detail to be a fossil animal in its own right, though algal activity may have played a part in producing the lumps on the surface.  It has a slightly laminated appearance and I believe it to be a sedimentary accretion.  Whether it has a nucleus of any kind could only be resolved by sectioning and polishing it, but I did notice the tell-tale signs of pyrite decay products around the edge of the central lamina.
Pyrite is widespread in the Westbury Formation.  It exists as individual cubes, clusters (framboids) and granules, and is largely responsible for the bluish black colour of the sediment. It arose as a result of the reaction between iron hydroxide gels (these are excreted by algal blooms) and sulphur liberated by sulphur-reducing bacteria sourced from organic matter such as coprolites or decaying plant material. The effect of one of these FeS clusters (they only need to be a few microns in diameter) at the sediment/water interface is to create a patch wherein the pH of the pore seawater is considerably reduced in relation to its surroundings; an acid bubble, if you like. Trapped within the sediment, this can have the effect of attracting, dissolving and then precipitating any calcareous material suspended in the seawater.
Bear in mind that the environment at this time was in the process of changing from the brackish marine conditions of the first Upper Triassic incursion, to the fluvial channel conditions of the much more calcareous Cotham Member, and ultimately culminated in the lagoonal, nodular calcareous mudstone strings of the pre "White Lias"  After the desert conditions of the Keuper, things became more and more propitious for shelled marine life, so it sort of fed off itself and there would have been more and more calcareous material present in the water, starting from small beginnings. Rhythmic precipitation of this sort, discussed by Tony Hallam in about 1966 I think, responds to seasonal and even diurnal temperature and salinity changes and proceeds from small pea-sized "nummular" nodules to gradually bigger ones and finally coalescing into continuous beds. Hope this helps."
It certainly does, thank you!

Good lectures - October 1st and October 7th

October 1st
A Bug’s Life: The role of micropalaeontology in industrial problem solving
Professor Malcolm Hart, Emeritus Professor of Micropalaeontology at the University of Plymouth
Micropalaeontology is the study of microscopic fossils and has been used extensively by the hydrocarbons industry for the stratigraphical correlation of rock successions (especially recovered in boreholes). In many quarrying or engineering projects stratigraphical “control” is also required and this will be explained using the site investigation for the Thames Barrier and the construction of the Channel Tunnel as the leading examples.
Bath Geological Society for details

Wednesday October 7th
William Smith Bicentenary: Visualising Landscapes and Geology, Past, Present and Future
Professor Iain Stewart, University of Plymouth
The Geological Society of London, Wills Memorial Building, University of Bristol

New duck-billed, plant eating dinosaur

Click here to read story and watch video

Homo naledi, a new species of human, discovered in a cave in South Africa

More Recent Articles

You Might Like

Click here to safely unsubscribe from "Geology in the West Country."
Click here to view mailing archives, here to change your preferences, or here to subscribePrivacy