The BGS Lexicon of Named Rock Units — Result Details

Sherrycombe Member

Computer Code: SHCM Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Eifelian Age (DI) — Eifelian Age (DI)
Lithological Description: Mainly upward-coarsening sandstones above a scoured base. Naticopsis, Myalina and, very rarely, fragments of Thamnopora are found in thin shelly mounds above the scoured surfaces. These sequences give way to grey lenticular-bedded mudstones with sporadic Chondrites and, in the highest beds, Diplocraterion. Cross-bedded sandstones follow to complete the uplands-coarsening sequence.
Definition of Lower Boundary: Sharp transgressive base on rocks of the Rawns Member (q.v.).
Definition of Upper Boundary: Overlain by the basal 1m-thick bed at the base of the Little Hangman Member (q.v.), which contains Mylina (mostly in life position) and bryozoans.
Thickness: 90m
Geographical Limits: North Devon - west Somerset.
Parent Unit: Hangman Sandstone Formation (HASA)
Previous Name(s): Sherrycombe Beds (-520)
Sherrycombe Formation (-1178)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Sea cliffs below Little Hangman, near Combe Martin, North Devon; upper part of member accesslible for up to 2 hours before and after low water. Base of member occurs at the top of the second sea cave beneath Little Hangman. 
Reference(s):
Evans, J W. 1922. The geological structure of the country round Combe Martin. Proceedings of the Geologists' Association, Vol.33, 201-228. 
Tunbridge, I P. 1978. North Devon - Lower and Middle Devonian: Hangman Sandstone Group. 9-13 in Scrutton, C T (Editor), A field guide to selected areas of the Devonian of south-west England. International Symposium on the Devonian System. (PADS 78). (Palaeontological Association). 
Lane, R. 1965. The Hangman Grits - an introduction and stratigraphy. Proceedings of the Ussher Society, Vol.1, 166-167. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable