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 Formation [Obsolete Name and Code: Use SHCM]
(-1178)
Sherrycombe Beds (-520) |
||
| 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): | |||
| 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. | |||
| Evans, J W. 1922. The geological structure of the country round Combe Martin. Proceedings of the Geologists' Association, Vol.33, 201-228. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||