Computer Code: |
CLIF |
Preferred Map Code: |
CLIF |
Status Code: |
Full |
Age range: |
Ashgill Series (OA)
— Ashgill Series (OA) |
Lithological Description: |
Grey unbedded silty mudstone with sparse brachiopod fauna (slump sheet). |
Definition of Lower Boundary: |
Succeeds the grey-green well-bedded mudstones and siltstones and thinly bedded sandstones of the Farden Member, with the very fossiliferous Starfish Beds at its summit. |
Definition of Upper Boundary: |
Succeeded by grey-green bedded mudstones and siltstones of the Waterfall Member. |
Thickness: |
c.10m |
Geographical Limits: |
Girvan area, southwest Scotland. |
Parent Unit: |
South Threave Formation (STHV)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
Lady Burn, Craighead Inlier, c.700m eastnortheast of South Threave Farm. Harper, 1982. |
Reference(s): |
Harper, D A T, 1982. The stratigraphy of the Drummock Group (Ashgill), Girvan. Geological Journal, Vol.17, p.251-277.l. 17 251-277 |
Harper, D A T, 1984. Brachiopods from the Upper Ardmillan succession (Ordovician) of the Girvan district, Scotland. Part 1. Monograph of the Palaeontographical Society, London. 1-78 (Publication No.565, part of Vol.136 for 1982). |
Floyd, J D and Ingham, J K (in prep). A Stratigraphical Lexicon of the Lower Palaeozoic rocks of the Girvan-Ballantrae district, southwest Scotland. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |