| Computer Code: |
MOSA |
Preferred Map Code: |
MOSA |
| Status Code: |
Full |
| Age range: |
Hauterivian Age (KH)
— Barremian Age (KB) |
| Lithological Description: |
Sandstone, fine-grained, silty, glauconitic, very dark grey. Bioturbated with moulds of mollusca. |
| Definition of Lower Boundary: |
Not exposed. Probably unconformable on granite, or crystalline basement. Basal unit usually a strongly weathered siltstone. |
| Definition of Upper Boundary: |
Unconformable, overlain by the Buchan Ridge Gravel Member. |
| Thickness: |
About 12m. Not seen at one exposure. |
| Geographical Limits: |
The Buchan Ridge of Flett and Reed, 1921; Moss of Cruden. 1:10,000 sheets NK04SW, NK03NW. 1:50k geological sheet 87W (Ellon) and 87E (Peterhead). |
| Parent Unit: |
Cromer Knoll Group (CRKN)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Moss of Cruden, Aberdeenshire BGS registered pits, NK04SW 13, 14 & 17. Seen in temporary trial pits only, eg. NK04SW 13-15, 33-34, 24-26, 48. |
| Reference(s): |
| Merritt, J W, Auton, C A, Connell, E R, Hall, A M and Peacock, J D. 2003. The Cainozoic geology and landscape evolution of north-east Scotland. Memoir of the British Geological Survey, Sheets 66E, 67, 76E, 77, 86E, 87W, 87E, 95, 96W, 96E and 97 (Scotland) |
| Flett, J S and Read, H H, 1921. Tertiary gravels of the Buchan district of Aberdeenshire. Geological Magazine, Vol.58, p.215-225. |
| Hall, A M and Jarvis, J, 1994. A concealed Lower Cretaceous outlier at Moss of Cruden, Grampian Region, Scotland. Scottish Journal of Geology, Vol.30, 163-166. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S087
S087
|
