| Computer Code: |
SDSH |
Preferred Map Code: |
SdSh |
| Status Code: |
Full |
| Age range: |
Arnsbergian Substage (CG)
— Kinderscoutian Substage (CK) |
| Lithological Description: |
[Obsolete: use SAML]
A fossiliferous mudstone with subordinate beds of locally pebbly sandstone and thin argillaceous limestone and ironstone. |
| Definition of Lower Boundary: |
The lower boundary is taken at the base of fissile black mudstones of the Reticuloceras reticulum Marine Band, or where this is absent, at the base of the mudstone-dominated succession overlying the sandstones of the Warley Wise [Wilpshire] Grit |
| Definition of Upper Boundary: |
The upper boundary is taken at the base of a sandstone-dominated succession of the Todmorden (Parsonage) Grit, overlying the mudstone-dominated Sabden Shales |
| Thickness: |
About 400m |
| Geographical Limits: |
Longridge [SD 60 35] to Bailey Hall [SD 68 37] on the Ribchester Syncline, eastwards to approximately Foulridge [SD 88 42]. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
Sabden Shales Formation [Obsolete Name and Code: Use SDSH]
(-1810)
|
| Alternative Name(s): |
Part Of The Formally Defined Silsden, Samlesbury And Hebden Formations
|
| Stratotypes: |
| Partial Type Section |
Immediately north of Samlesbury Bottoms, on the east bank of the River Darwen in Blackburn, Lancashire, where approximately 130m of the upper part of the unit is exposed (E2, H and R1) in a river section. Price et al., 1963. |
| Reference Section |
Stream section along Duddel Brook, Ribchester Lancashire, which exposes 208 m from the mid part of the unit. Aitkinhead et al., 1992. |
| Reference(s): |
| Waters, C N, Waters, R A, Barclay, W J, and Davies, J R. 2009. Lithostratigraphical framework for Carboniferous successions of Southern Great Britain (Onshore). British Geological Survey Research Report, RR/09/01. 184pp. |
| Aitkenhead, N, Bridge, D M, Riley, N J, and Kimbell, S F. 1992. Geology of the country around Garstang. Memoir of the British Geological Survey, Sheet 67 (England and Wales) |
| Price, D, Wright, W B, Jones, R C B, Tonks, L H and Whitehead, T H. 1963. Geology of the country around Preston. Memoir of the Geological Survey of Great Britain, Sheet 75 (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E067
E076
E075
E068
|
