| Computer Code: |
HFMB |
Preferred Map Code: |
HFM |
| Status Code: |
Full |
| Age range: |
Comley Series (EC)
— Comley Series (EC) |
| Lithological Description: |
Basal quartzose conglomerate and calcareous sandstone overlain by maroon sandy limestones with siltstone layers, hardground surfaces and stromatolites. Shelly faunas locally abundant. |
| Definition of Lower Boundary: |
At base of the grey quartzose conglomerate or, where absent, the lower maroon carbonate-cemented sandstone. Sharpness of contact suggests a disconformity. |
| Definition of Upper Boundary: |
Sharp hardground surface, on which rests basal grey, glauconitic sandstone of Woodlands Member; a thin mudstone drape occurs locally. |
| Thickness: |
1.5-2m in general area; 1.8m in type section. |
| Geographical Limits: |
From Nuneaton town centre, extending northwest for 5.2km to Worthington Farm, Mancetter (SP 3533 9199 - SP 3192 9572). |
| Parent Unit: |
Hartshill Sandstone Formation (CQ)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Northeast face of Woodlands Quarry, 200m north-north-west of Hartshill Green. |
| 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: |
| none recorded or not applicable |
