| Computer Code: |
DOLL |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Bathonian Age (JN)
— Callovian Age (JC) |
| Lithological Description: |
Sandstone, medium-grained, white, soft, pure quartz, massive and cross-bedded, cross-laminated and parallel laminated, up to 20 m thick (Doll Sandstone Unit (= Bed) of Hurst (1981), overlain by over 30 m of grey shaly mudstone with thin interbedded sideritic mudstone beds ('cementstones' of early usage) that are laterally extensive; together these two units constitute the Doll Member. Its top is marked by a prominent brecciated siderite-cemented mudstone horizon (Bed 1 of Hurst, 1981). |
| Definition of Lower Boundary: |
As for Brora Coal Formation (BOCO). |
| Definition of Upper Boundary: |
Overlain by the Inverbrora Member (INVBR). |
| Thickness: |
Over 50 m. |
| Geographical Limits: |
Brora area, Sutherland, Scotland. |
| Parent Unit: |
Brora Coal Formation (BOCO)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Foreshore south of the River Brora estuary, Sutherland [NC 900 030], between the Brora Fault and the railway, and the sea. |
| Reference(s): |
| Barron, A J M, Lott, G K, and Riding, J B. 2012. Stratigraphical framework for the Middle Jurassic strata of Great Britain and the adjoining continental shelf. British Geological Survey Research Report RR/11/06. |
| Hurst, A R. 1981. Mid Jurassic stratigraphy and facies at Brora, Sutherland. Scottish Journal of Geology, Vol. 17, p. 169 - 177. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
