The BGS Lexicon of Named Rock Units — Result Details

Greystone Formation [Obsolete: use BREN]

Computer Code: GSTN Preferred Map Code: notEntered
Status Code: Index Level
Age range: Tournaisian Age (CT) — Tournaisian Age (CT)
Lithological Description: [Obsolete: use BREN] Dark grey siltstone and slate with tuff and pillow lava.
Definition of Lower Boundary: Thrust fault.
Definition of Upper Boundary: Thrust fault.
Thickness: Not known.
Geographical Limits: none recorded or not applicable
Parent Unit: none recorded or not applicable
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Not Entered 
Reference(s):
British Geological Survey. 1993. Tavistock. England and Wales Sheet 337. Solid and Drift 1:50 000 Provisional Series (Keyworth, Nottingham: British Geological Survey.) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable