The BGS Lexicon of Named Rock Units — Result Details

Lydford Formation

Computer Code: LYDD Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Tournaisian Stage (CT) — Visean Stage (CV)
Lithological Description: Dark grey and black shale and sedimentary breccia beds.
Definition of Lower Boundary: Thrust fault.
Definition of Upper Boundary: Thrust fault.
Thickness: Not known.
Geographical Limits: West Devon.
Parent Unit: Not Applicable (-)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Lydford Gorge, West Devon. Issac, K P, 1985. 
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). 
Isaac, K P. 1985. Thrust and nappe tectonics of west Devon. Proceedings of the Geologists' Association, Vol.96, 109-127. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable