Leeds Geological Association


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Leeds Geological Association

 


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The Leeds Geological Association aims to promote and further interest in the geological sciences, both amongst its members and within the wider community. Particular emphasis is placed on the geology of the region and its relationship to landscape and scenery.

Membership is open to all.

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CORONAVIRUS (COVID-19) UPDATE


In light of the continuing efforts to limit the spread of coronavirus (COVID-19) no meetings involving face to face contact will be held until further notice. Where possible they will be conducted via the Internet.


NEXT MEETING

Thursday 15th April 2021

7:15PM

This meeting will be delivered remotely via Microsoft Teams


A Re-evaluation of Glacial Lake Pickering

Dr Laura Eddey
University of Sheffield


During the Quaternary, repeated glacial cycles left widespread deposits across Britain. These deposits hold an archive of terrestrial responses to changes in climate over the last 2.6 Ma. One such archive is the Vale of Pickering in North Yorkshire: a low-lying depression bounded on all sides save the east end by large hills comprised of Jurassic and Cretaceous bedrock. During the Late Quaternary, this natural basin was blocked by ice sheets forming large proglacial lakes. To understand the advance and retreat of the surrounding ice lobes in the Vale of York to the west and the North Sea Lobe to the east -the deposits of the Vale of Pickering are crucial; however, limited work in the area has failed to ascertain an accurate history of Lake Pickering. Using newly available high-resolution LiDAR data, field observations, historic borehole records, and optically stimulated luminescence (OSL) dating, a new chronological model for Lake Pickering has been established. This shows that 1) previously estimated lake levels are too high and that during the LGM, Lake Pickering was no more than 33 m O.D. 2) Ice invaded the eastern coast of the Vale of Pickering on more than one occasion, potentially earlier than the LGM. 3) Several iterations of Lake Pickering exist with a lake during the LGM, but at least one older than 30 ka. 4) The drainage of Lake Pickering is very complex and seaward drainage likely prevailed until the eastern end became blocked by continued deposition of glacial material. This reversed the drainage through the Kirkham Gorge. 5) The use of newer geoscientific techniques like OSL and LiDAR mapping are crucial to the understanding of the palaeoenvironment of the Vale of Pickering and the continued development of these techniques are vital to further work.

This talk will be delivered via Microsoft Teams. Joining instructions will be circulated to members nearer the date. Non-members are welcome to attend and should email the Secretary at [email protected] no later than 24 hours before the scheduled start time, to request joining instructions.


Photo: Glacial Lake Pickering

The reconstruction of Glacial Lake Pickering and associated lakes on the North Yorkshire Moors,
impounded by ice moving down the margins of the North Sea basin (adapted from Kendall, 1902).


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