| Computer Code: |
PAH |
Preferred Map Code: |
PHM |
| Status Code: |
Full |
| Age range: |
Comley Series (EC)
— Comley Series (EC) |
| Lithological Description: |
Grey medium-grained sandstone with thin breccia layers in basal 17m: main part in beds 0.2-0.8m thick showing herringbone cross-bedding. Very rare mudstone beds or drapes. |
| Definition of Lower Boundary: |
At base of first bed to show cross bedding and an undulatory top surface. Lower sandstones are massive, with planar or only gently undulatory tops. |
| Definition of Upper Boundary: |
Bedding plane beneath first significant development of mudstone with thin, sharp-based sandstone beds. Mudstone drapes ubiquitous in beds above this. |
| Thickness: |
30 - 56m. 35m in type section (min), 34m in reference section (min). |
| Geographical Limits: |
From Nuneaton town centre, extending northwest for 3.5km to just east of Cherry Tree Farm (SP 3548 9220-3262 9521) |
| Parent Unit: |
Hartshill Sandstone Formation (CQ)
|
| Previous Name(s): |
Park Hill Quartzite [Obsolete Name and Code: Use PAH]
(-3602)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Northeast face of Hartshill Quarry, 700m west-north-west of Hill Farm (SP 3425 9360) |
| Partial Type Section |
Upper northwest face of Boons Quarry, 150m west-north-west of Grange Farm. |
| Reference(s): |
| Brasier, M D, Hewitt, R A, and Brasier, C J. 1978. On the late Precambrian - Early Cambrian Hartshill Formation of Warwickshire. Geological Magazine, Vol. 115/1, 21-36. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E169
|
