Computer Code: |
PRK |
Preferred Map Code: |
PrkM |
Status Code: |
Full |
Age range: |
Eifelian Age (DI)
— Givetian Age (DV) |
Lithological Description: |
Thin- to medium-bedded, fine- to medium-grained skeletal wackestone and packstone with stylolitic mudstone partings and interbeds. Coarser crinoidal lithologies occur in lower part and form basal lags of graded and cross-stratified packstone beds that are common in upper part. The limestone is typically dark grey and foetid. |
Definition of Lower Boundary: |
Basal mudstones conformably succeed the Faraday Road Member. |
Definition of Upper Boundary: |
Succeeded by red and black reef limestone of late Givetian age of the undivided Plymouth Limestone Formation. |
Thickness: |
none recorded or not applicable
|
Geographical Limits: |
Coxside area of Plymouth (geological sheet 348) and Prince Rock area of Plymouth (geological sheet 349). |
Parent Unit: |
Plymouth Limestone Formation (PYL)
|
Previous Name(s): |
Plymouth Limestone
(-901)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Reference Section |
Sea cliffs, Coxside: East Pier to Dearman's Bay. |
Reference(s): |
Leveridge B E, Holder, M T, Goode, A J J, Scrivener R C, Jones N S and Merriman, R J. 2002. Geology of the Plymouth and south-east Cornwall area. Memoir of the British Geological Survey, Sheet 348 (England and Wales). |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E348
|