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Sunday 8 September 2024

BRITICE Devensian ice sheet animation: a model for the Wolstonian?


https://www.youtube.com/watch?v=oABxYza9ELM

This BRITICE animation, from 6 years ago, is suddenly relevant again because of the latest research showing that the pattern of glaciation assumed to be more or less correct for the Anglian glaciation may in fact accurately represent the ice extent of the Wolstonian British and Irish ice sheet.  In turn, the "extreme" model generated for the Devensian seems to fit rather well, with ice extent somewhat greater than that of the Late Devensian.

The model at 21 K shows approximate maximum ice extent. This is really interesting, as it shows rapidly streaming ice crossing western Pembrokeshire, with more sluggish ice in the east.  It shows the thin local ice caps of Exmoor, Dartmoor and Bodmin Moor incorporated into the main body of ice, with Irish Sea ice flowing between them and affecting the whole of the SW Peninsula.  That makes glaciological sense.  Then -- and this is really interesting -- the model throws up a stream of rapidly moving ice pushing far into the Somerset Levels depression almost as far as the English Channel coast.  I had not noticed this feature before -- but of course it backs up what I have suggested, and also the claim (made by Gilbertson and Hawkins many years ago) that glacier ice penetrated as far east as Salisbury Plain.


Watch this space......

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