| Computer Code: |
BGA |
Preferred Map Code: |
BGA |
| Status Code: |
Full |
| Age range: |
Streffordian Stage (OX)
— Streffordian Stage (OX) |
| Lithological Description: |
A suite of fossiliferous channel-fill sandstones in the upper part of the (silty-)mudstone-dominated Myoch Formation, containing distinctive late Caradoc shelly fossils. |
| Definition of Lower Boundary: |
Base of sandstone lithology overlying dominantly silty mudstones of the enclosing undifferentiated Myoch Formation. |
| Definition of Upper Boundary: |
Taken at the top of the sandstone lithology beneath the overlying dominantly silty mudstones of the enclosing undifferentiated Myoch Formation. |
| Thickness: |
About 8m |
| Geographical Limits: |
The Girvan area of southwest Scotland. |
| Parent Unit: |
Myoch Formation (MYO)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Penwhapple Burn, 6km east of Girvan. |
| Reference(s): |
| Fortey, R A, Harper, D A T, Ingham, J K, Owen, A W, Parkes, M A, Rushton, A W A and Woodcock, N H. 2000. A revised correlation of Ordovician rocks in the British Isles. Geological Society Special Report, No.24. |
| Lapworth, C, 1882. The Girvan Succession. Quarterly Journal of the Geological Society of London, Vol. 38, 537-666. |
| Williams, A, 1962. The Barr and Lower Ardmillan Series (Caradoc) of the Girvan district, southwest Ayrshire, with descriptions of the Brachiopoda. Memoir of the Geological Society of London, No.3. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
