| Computer Code: |
DLP |
Preferred Map Code: |
Dlp |
| Status Code: |
Full |
| Age range: |
Chokierian Substage (CH)
— Alportian Substage (CO) |
| Lithological Description: |
Mudstone, dark grey, with poor bivalve fauna. |
| Definition of Lower Boundary: |
Top of Accerhill Sandstone; medium- to coarse-grained sandstones with abundant plant debris, overlain sharply by the mudstone-dominated Dolphinholme Mudstone. |
| Definition of Upper Boundary: |
Abrupt change to medium-grained, thinly bedded sandstone of the succeeding Ellel Crag Sandstone, with abundant plant debris, allochtonous coal lenses and thin siltstone interbeds. |
| Thickness: |
c 60m |
| Geographical Limits: |
Ellel, Forton, Lancashire. |
| Parent Unit: |
Samlesbury Formation (SAML)
|
| Previous Name(s): |
Dolphinholme Mudstone Formation [Obsolete Name and Code: Use DLP]
(-2757)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
100m to east of Dolphinholme Church in Wyre Valley, Lancashire. |
| 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) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E067
E059
|
