| Computer Code: |
PGL |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Brigantian Substage (CX)
— Brigantian Substage (CX) |
| Lithological Description: |
A thick, laterally persistent limestone. In the Northumberland Trough and Solway Basin, the base of the Alston Formation is defined at the base of the Peghorn Limestone or its correlatives. |
| Definition of Lower Boundary: |
In the Northumberland Trough and Solway Basin, the base of the Alston Formation, defined at the base of the Peghorn Limestone (or its correlatives), lies conformably on the Tyne Limestone Formation. In the Brough-under-Stainmore and Penrith districts the Peghorn Limestone is underlain by siltstone or sandstone of the Wintertarn Sandstone Member, Tyne Limestone Formation. |
| Definition of Upper Boundary: |
none recorded or not applicable
|
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
none recorded or not applicable
|
| Parent Unit: |
Alston Formation (AG)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Dean, M T, Browne, M A E, Waters, C N and Powell, J H. 2011. A lithostratigraphical framework for the Carboniferous successions of northern Great Britain (onshore). British Geological Survey Research Report, RR/10/007. 165pp. |
| George, T N, Johnson, G A L, Mitchell, M, Prentice, J E, Ramsbottam, W H C, Sevastopulo, G D and Wilson, R B. 1976. A correlation of the Dinantian rocks of the British Isles. Special Report of the Geological Society of London, No 7. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E031
E025
E040
E026
|
