| Computer Code: |
STM |
Preferred Map Code: |
notEntered |
| Status Code: |
Pending Upgrade |
| Age range: |
Rhaetian Age (TR)
— Hettangian Age (JH) |
| Lithological Description: |
none recorded or not applicable
|
| Definition of Lower Boundary: |
none recorded or not applicable
|
| Definition of Upper Boundary: |
none recorded or not applicable
|
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
South Wales. |
| Parent Unit: |
Blue Lias Formation (BLI)
|
| Previous Name(s): |
St Marys Well Bay Formation [Obsolete Name and Code: Use STM]
(-1206)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Cox, B M, Sumbler, M G, and Ivimey-Cook, H C. 1999. A Formational framework for the Lower Jurassic of England and Wales (Onshore Area). British Geological Survey Research Report RR/99/01. |
| Waters, R A and Lawrence, D J D. 1987. Geology of the South Wales Coalfield - Part III: the country around Cardiff. Memoir of the British Geological Survey, Sheet 263. (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E263
E262
|
