The Vale of Glamorgan coast, with hardly any Quaternary sediments exposed. Inland, a gentle, rolling, well-wooded landscape with prosperous farms and pretty villages.......
The Vale of Glamorgan -- what is the story? Ice-free enclave, or just an area which happens to have very few exposures of Quaternary sediments, like Jameson Land and Buchan?
Assumed late Devensian ice limits, after DQ Bowen, as published in the GCR volume on Wales, 1989, p 133. Most of Pembrokeshire is shown as ice-free, as well as western and southern Gower and most of the Vale of Glamorgan. But here it is assumed that Devensian ice projected south of the present coastline between Cardiff and Newport.
PHILIP L. GIBBARD, PHILIP D. HUGHES and CHRISTOPHER J. ROLFE
JOURNAL OF QUATERNARY SCIENCE (2017)
BGS Cardiff Memoir (Sheet 263) - new edition
Waters and Lawrence, 1987
BGS Bridgend Memoir (Sheets 261 and 262) - new edition
Wilson, Davies, Fletcher and Smith, 1990
In the "Quaternary" sections of both of these publications there is a great deal of evidence with many cited references, but the question of the "ice-free enclave" is not adequately addressed, and there is a layer of confusion (as in the GCR volume on Wales) caused by the unnecessary labelling of units into the lithostratigraphic scheme of DQ Bowen, which has caused mayhem in Welsh Quaternary studies over the past 30 years.........
This is one of my recent attempts to define the extent of ice cover in the late Devensian, in South Wales and the Bristol Channel. As I have explained in other posts, I'm intrigued by South Pembrokeshire, where there are abundant erratics and extensive areas of till and glaciofluvial sands and gravels which appear -- in places like Picton Point and Landshipping -- to be remarkably fresh. The numerous exposures of fresh till on the South Pembrokeshire coast undicates the presence of a Celtic Sea ice lobe that pushed into the outer reaches of the Bristol Channel, as far as Swansea Bay. I'm not convinced that the western tip of Gower was ice-free during the LGM, no matter what the senior geomorphologists from Swansea University might say!
Watch this space........
PS. 4th Oct 2020. The ice-free enclave hypothesis begins to crumble. I found this reference:
The latter location, SE of Llandough and S of St Hilary, needs investigation to see how the "outwash terrace" relates to nearby glacial deposits.