| Computer Code: |
DUA |
Preferred Map Code: |
notEntered |
| Status Code: |
Full, pending ratification |
| Age range: |
Arundian Substage (CJ)
— Arundian Substage (CJ) |
| Lithological Description: |
Dark, fissile, calcareous mudstone with sporadic petroliferous, wackestone nodules - 'bullions'. Bed crowded with bivalves - 'Dunbarella' and 'Pteronites'. |
| Definition of Lower Boundary: |
Not defined. |
| Definition of Upper Boundary: |
Not defined. |
| Thickness: |
0.2m |
| Geographical Limits: |
Craven Basin, northwest England. |
| Parent Unit: |
Chaigley Limestone Member (CHGL)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Stream at Paper Mill Wood, Sandal Holme Farm, Clitheroe, Lancashire, England. |
| Reference Section |
Leagram Brook, near Clitheroe, Lancashire, England. |
| Type Section |
Bonstone Brook, Ashnott, Newton, near Clitheroe, Lancashire, England. |
| 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. |
| Hind, W and Howe, J A. 1901. The geological succession and palaeontology of the beds between the Millstone Grit and the Limestone-Massif at Pendle Hill and their equivalents in certain other parts of Britain. Quarterly Journal of the Geological Society of London, Vol.57, 347-402. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
