| Computer Code: |
GLWH |
Preferred Map Code: |
GLWH |
| Status Code: |
Index Level |
| Age range: |
Caradoc Series (O4)
— Ashgill Series (OA) |
| Lithological Description: |
[Obsolete: use PPF] Mainly thick-bedded greywackes. Rich in ferromagnesian minerals, poor in quartz. |
| Definition of Lower Boundary: |
Faulted against Boreland Formation. |
| Definition of Upper Boundary: |
Faulted against Lochryan Formation. |
| Thickness: |
Not defined. |
| Geographical Limits: |
Not defined. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
Portpatrick Formation
|
| Stratotypes: |
| Type Area |
Craig Fell, Sheet S3 (Stranraer). |
| Reference(s): |
| Walton, E K. 1983. Lower Palaeozoic - Stratigraphy. In Craig, G Y (editor), Geology of Scotland (2nd edition)(Edinburgh: Scottish Academic Press.) |
| Welsh, W. Not published. The Ordovician rocks of northwest Wigtownshire. Ph.D. Thesis, University of Edinburgh, 1964. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S003
|
