| Computer Code: |
PRH |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Llandovery Epoch (SL)
— Wenlock Epoch (SW) |
| Lithological Description: |
Greywackes, sandstones, siltstones and mudstones with sporadic carbonaceous silty layers. (Correlative of Priesthill Group = Hagshaw Group.) |
| Definition of Lower Boundary: |
Drawn at base of greywackes of the Patrickburn Formation where it rests on the Ordovician. |
| Definition of Upper Boundary: |
Drawn at conformable upward passage from sandstones of the Dunside Formation to sandstone of the Passage Formation of the Waterhead Group. |
| Thickness: |
750m approx. |
| Geographical Limits: |
Midland valley, Strathclyde, Scotland. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Lesmahagow, Strathclyde, Scotland. |
| Reference(s): |
| Walton, E K. 1983. Lower Palaeozoic - Stratigraphy. In Craig, G Y (editor), Geology of Scotland (2nd edition)(Edinburgh: Scottish Academic Press.) |
| Geikie, A. 1873. Lanarkshire: Central Districts. Memoirs of the Geological Survey of Scotland. |
| Cameron, I B, and Stephenson, D. 1985. British Regional Geology: The Midland Valley of Scotland (3rd Edition). (London: HMSO for British Geological Survey.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
