| Computer Code: |
LYDD |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Tournaisian Age (CT)
— Visean Age (CV) |
| Lithological Description: |
[Obsolete: use BREN]
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: |
none recorded or 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, 1985. |
| Reference(s): |
| Isaac, K P. 1985. Thrust and nappe tectonics of west Devon. Proceedings of the Geologists' Association, Vol.96, 109-127. |
| 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 |
