| Computer Code: |
POAN |
Preferred Map Code: |
Ptn |
| Status Code: |
Full |
| Age range: |
Eifelian Age (DI)
— Frasnian Age (DR) |
| Lithological Description: |
Interbedded slaty mudstone, grey and grey-green, and sandstone. Subordinate sandstone beds are up to 2m thick, typical turbidites. |
| Definition of Lower Boundary: |
Transition above Grampound Formation of Meadfoot Group. |
| Definition of Upper Boundary: |
Transition with Mylor Slate Formation. |
| Thickness: |
2.8km |
| Geographical Limits: |
West Cornwall. |
| Parent Unit: |
Gramscatho Group (GRO)
|
| Previous Name(s): |
Gramscatho Beds [Obsolete Name and Code: Use POAN, GRO]
(-2375)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Coastal section, West Cornwall, north-eastwards from Hells Mouth. |
| Reference(s): |
| Hendriks, E M L, 1931. The stratigraphy of South Cornwall Report of the British Association for 1930, 332 et seq. |
| Hill, J B and MacCallister, D A. 1906. The geology of Falmouth and Truro and of the mining district of Camborne and Redruth. Memoirs of the Geological Survey. Explanation of Sheet 352 (England and Wales). |
| Hendriks, E M L, 1937. Rock Succession and structure in South Cornwall, a revision. With notes on the central European facies and Variscan folding there present. Quarterly Journal of the Geological Society, London, Vol.93, 322-360. |
| Hendriks, E M L, 1949. The Gramscatho Series. Transactions of the Royal Geological Society of Cornwall, Vol.18, 50-61. |
| 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: |
|
E352
|
