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 |
Leagram Brook, near Clitheroe, Lancashire, England. |
Type Section |
Bonstone Brook, Ashnott, Newton, near Clitheroe, Lancashire, England. |
Reference Section |
Stream at Paper Mill Wood, Sandal Holme Farm, Clitheroe, Lancashire, England. |
Reference(s): |
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. |
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. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |