Computer Code: |
ACKW |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Bolsovian Substage (CC)
— Bolsovian Substage (CC) |
Lithological Description: |
Grey mudstones, siltstones and sandstones with thin coals. |
Definition of Lower Boundary: |
Top of Cambriense Marine Band (or where absent through washout: base of Ackworth Rock). |
Definition of Upper Boundary: |
Base of Brierley Coal. |
Thickness: |
c.100m |
Geographical Limits: |
Yorkshire Coalfield. |
Parent Unit: |
Pennine Upper Coal Measures Formation (PUCM)
|
Previous Name(s): |
Ackworth Division
(-631)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
Cherry Tree Borehole (near South Elmsall, Yorkshire). SE41SE/9. Depths of member 154.91-241.25m. (Samples RG 4241-4455 from 50' to 1946'). |
Reference(s): |
Goossens, R F and Smith, E G, 1973. The stratigraphy and structure of the Upper Coal Measures in the exposed Yorkshire Coalfield between Pontefract and South Kirkby. Proceedings of the Yorkshire Geological Society, Vol.39, 487-514. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |