| Computer Code: |
TRSA |
Preferred Map Code: |
notEntered |
| Status Code: |
Pending Upgrade |
| Age range: |
Mid Devonian Epoch (DM)
— Mid Devonian Epoch (DM) |
| Lithological Description: |
Sandstone beds to 6m (grainflows) with interbeds of grey slaty mudstone and yellow-green laminated siltstone. |
| Definition of Lower Boundary: |
Conformable within the Grampound Formation. |
| Definition of Upper Boundary: |
Conformable within the Grampound Formation. |
| Thickness: |
To 40m |
| Geographical Limits: |
Present at least along the northern margin of the Mevagissy (353) sheet and in the northeast corner of the Falmouth (352) sheet areas. |
| Parent Unit: |
Grampound Formation (GRAD)
|
| Previous Name(s): |
Grampound Grit [Obsolete Name And Code: Use TRSA Or GRAD]
(GPG)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Treworgans Quarry and its immediate vicinity. |
| Partial Type Section |
Coastal section at Pentewan. |
| Reference(s): |
| Leveridge, B E, 1987. Geological description for 1:10000 sheets SW84NW, NE, SW, Se and parts of SW94NW and SW (Truro). 51pp. (Keyworth: British Geological Survey.) |
| Leveridge, B E, Holder, M T and Goode, A J J, 1990. Geology of the country around Falmouth. Memoir of the British Geological Survey, Sheet 352 (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E353
E354
E352
|
