| Computer Code: |
WSG |
Preferred Map Code: |
WrSh |
| Status Code: |
Full |
| Age range: |
Chadian Substage (CI)
— Asbian Substage (CR) |
| Lithological Description: |
[Obsolete: use CRAV, CLL]
Predominantly calcareous mudstones, interbedded with limestones (commonly pale grey and coarsely bioclastic in the lower part), subordinate siltstones, limestone breccias and conglomerates, and sandstone. Bioturbation and soft sediment deformation are common, the latter mainly in the middle and upper part of the group. |
| Definition of Lower Boundary: |
Underlain by the Chatburn Limestone Formation (formerly Group). |
| Definition of Upper Boundary: |
Overlain by the Bowland Shale Formation. |
| Thickness: |
To 1700m |
| Geographical Limits: |
Craven Basin. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
Worston Shales [Obsolete Name and Code: Use WSG]
(WRSH)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Clitheroe Road cut, Worston, near Clitheroe, Lancashire). Lowest formation (Clitheroe Limestone Formation). |
| Reference(s): |
| Riley N J. 1990. Stratigraphy of the Worston Shale Group (Dinantian) Craven Basin, north-west England. Proceedings of the Yorkshire Geological Society, Vol. 48, 163-187. |
| Earp, J R, Magraw, D, Poole, E G, Land, D H and Whiteman, A J, 1961. Geology of the country around Clitheroe and Nelson. Memoir of the Geological Survey of Great Britain, Sheet.68, England and Wales, pp.346. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E060
|
