| Computer Code: |
CAV |
Preferred Map Code: |
CaV |
| Status Code: |
Full |
| Age range: |
Ediacaran Period (AD)
— Ediacaran Period (AD) |
| Lithological Description: |
Grey, massive, feldspar and quartz crystal-lapilli tuff with subordinate angular to subrounded lithic blocks. Intercalations of grey to green, fine, well-laminated to massive tuffaceous mudstone, siltstone and sandstone. |
| Definition of Lower Boundary: |
Not seen. |
| Definition of Upper Boundary: |
Unconformity surface. Overlain by Lower Cambrian beds of the Hartshill Sandstone Formation or by Triassic sandstone and breccia. |
| Thickness: |
130m minimum thickness in general area. 20m minimum in type section. |
| Geographical Limits: |
Extends from Nuneaton north-westwards to just south of Atherton Road (SP 3510 9266-3282 9509). |
| Parent Unit: |
Charnian Supergroup (CHA)
|
| Previous Name(s): |
Caldecote Volcanic Series
(-751)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
The upper northern level of Boons Quarry, 50m south of Grange Farm. |
| Reference(s): |
| Lapworth, C, Watts, W W and Harrison, W J, 1898. Sketch of the geology of the Birmingham district. Proceedings of the Geologists' Association of London, Vol.15, p.313-389. |
| 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
|
