University of Bristol Spelæological Society

Periglacial slope deposits and frost structures along the southern margins of the Severn Estuary (UBSS Proceedings v.16(3))

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Gilbertson,D.D., and Hawkins,A.B., 1983. Periglacial slope deposits and frost structures along the southern margins of the Severn Estuary. UBSS Proceedings, 16(3) , pp 175-184 Download PDF.

Abstract: Four temporary exposures at Clapton Nurseries, Wynhol valley, Clevedon Court and Tickenham Waterworks and the M5 Avonmouth Bridge are described. Several types of periglacial phenomena were noted, including frost shattered and soliflucted limestone breccias, soliflucted Mercia Mudstone, ice wedge casts, involutions, widened rock joints and aeolian coversand deposits. The stratigraphic significance of the sequences is discussed and it is concluded that there is evidence mainly from the Devensian and possibly from the Wolstonian stages of the Pleistocene.

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