The BGS Lexicon of Named Rock Units — Result Details

Greystone Formation [Obsolete Name And Code: Use BREN]

Computer Code: GSTN Preferred Map Code: notEntered
Status Code: Index Level
Age range: Tournaisian Stage (CT) — Tournaisian Stage (CT)
Lithological Description: 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: 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