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 Shales And Sandstones [Obsolete Name And Code: Use RWN]
(RSS)
Rawns Beds (-511) Rawns Formation [Obsolete Name and Code: Use RWN] (-3014) Rawns Shales [Obsolete Name and Code: Use RWN] (-3015) |
||
| 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. | |||
| 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). | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||