| Computer Code: |
BOWO |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Asbian Substage (CR)
— Asbian Substage (CR) |
| Lithological Description: |
Pale grey, massive and thickly bedded limestone. At the type locality the formation comprises very fine-to-very coarse-grained, slightly dolomitised packstones containing shell fragments with micritic [cyanobacterial] coatings, and calcareous mudstones |
| Definition of Lower Boundary: |
The base of the formation is not proved and the underlying succession is unknown |
| Definition of Upper Boundary: |
At Astbury [SJ 86 59], the top of the formation is taken at the conformable base of the mudstone-rich succession, with surbordinate limestone, of the Astbury Formation above the limestone- dominated succession of the Bowsey Wood Formation. In the Bowsey Wood and Bittern's Wood boreholes the top of the formation is an unconformity, overlain by mudstone of the Bowland Shale Formation. |
| Thickness: |
Minimum thickness of 13.5m measured at the type locality. |
| Geographical Limits: |
The formation occurs in the northern part of the Market Drayton Horst. The formation is limited in outcrop to a small inlier [about 1km long and 300m wide] at Limekiln Farm, Astbury [SJ 86 59]. The formation is also present in the subsurface within the Stoke-on-Trent, District, proved in the Bowsey Wood and Bittern's Wood boreholes. |
| Parent Unit: |
Peak Limestone Group (PKLM)
|
| Previous Name(s): |
Astbury Limestone [Obsolete Name and Code: Use BOWO]
(-2632)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Bowsey Wood Borehole SJ 74NE/9, cored 13.5 m thickness of the top of the formation. Earp and Calver, 1961. |
| Reference Section |
Bitten's Wood borehole SJ74SE/92, [SJ 7662 4286]: uppermost 1.5m of formation proved. Rees and Wilson, 1998. |
| Reference(s): |
| Evans, W B, Wilson, A A, Taylor, B J and Price, D. 1968. Geology of the country around Macclesfield, Congleton, Crewe and Middlewich. Memoir of the Geological Survey of Great Britain, Sheet 110 (England and Wales). |
| Rees, J G and Wilson, A A. 1998. Geology of the country around Stoke-on-Trent. Memoir of the British Geological Survey, Sheet 123 (England and Wales). |
| Waters, C N, Barclay, W J, Davies, J R and Waters, R A. In press. Stratigraphical framework for Carboniferous successions of Southern Great Britain (Onshore). British Geological Survey Research Report, RR/05/06. |
| Earp, J R and Calver, M A. 1961. Exploratory boreholes in the North Staffordshire Coalfield. Bulletin of the Geological Survey of Great Britain, Vol. 17, 153-190. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E110
|
