The BGS Lexicon of Named Rock Units — Result Details

Rawns Member

Computer Code: RWN Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Eifelian Age (DI) — Eifelian Age (DI)
Lithological Description: Coarse-grained, pebbly sandstone with angular exotic clasts; the uppermost 22m are mainly fine-grained and lacking in exotic materials.
Definition of Lower Boundary: ?Conformable on rocks of the Trentishoe Member (q.v.).
Definition of Upper Boundary: Abrupt boundary with overlying transgressive grey mudstones of the Sherrycombe Member (q.v.).
Thickness: 148m (Tunbridge, 1978).
Geographical Limits: North Devon - west Somerset.
Parent Unit: Hangman Sandstone Formation (HASA)
Previous Name(s): Rawns Beds (-511)
Rawns Formation (-3014)
Rawns Shales (-3015)
Rawns Shales And Sandstones [Obsolete Name And Code: Use RWN] (RSS)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Sea cliffs below Little Hangman, near Combe Martin, North Devon; well exposed, but section only accessible for one hour before and after low water at spring tides. 
Reference(s):
Lane, R. 1965. The Hangman Grits - an introduction and stratigraphy. Proceedings of the Ussher Society, Vol.1, 166-167. 
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). 
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