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Monday, 26 May 2025

Gwbert raised beach platform

 



Down on the Teifi Estuary this morning checking out the situation on the east side of the river mouth. There used to be amazing exposures of Irish Sea till here (back in the 1960's) but they were destroyed with the building of new coastal defences and a new caravan park.  


The Irish Sea till is still there, in patches, resting on the old raised beach platforms which are still visible.  These are the counterparts of the raised beach platforms exposed at Poppit, on the other side of the river mouth.  There are occasional exposures of till, fluvio-glacial materials and slope breccia, but because there has been so much slumping it's almost impossible to see stratigraphic relationships. 

The higher parts of the raised beach platform seem to be well above the influence of current HWM coastal processes, so  I interpret the smoothing and rounding of bedrock undulations to glacial erosion prior to the deposition of the till.

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