| Computer Code: |
WCF |
Preferred Map Code: |
WCF |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
[Obsolete: use AIB, WNY] Andesitic tuff-breccia and lapilli tuff; locally with a eutaxitic texture markedly heterolithic. |
| Definition of Lower Boundary: |
Base taken at change in lithology (from lavas to tuff-breccia). |
| Definition of Upper Boundary: |
Overlain by bedded tuffs of the Crosbythwaite Formation or rhyodacitic lapilli tuffs of the Waberthwaite Formation. |
| Thickness: |
About 200 metres. |
| Geographical Limits: |
Not defined. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
Worm Crag Group
(-602)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Great Worm Crag, 1:50,000 Sheet 38 (Ambleside), O.S. 1:50,000 Sheet 96 South Lakeland. |
| Reference(s): |
| Firman, R G J, 1957. The Borrowdale Volcanic Series between Wastwater and Duddon Valley, Cumberland. Proceedings of the Yorkshire Geological Society, Vol.31, p.39-64. |
| Millward, D. 2004. A stratigraphical framework for the Upper Ordovician and Lower Devonian volcanic and intrusive rocks in the English Lake District and adjacent areas. British Geological Survey, Research Report: RR/01/007. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E038
|
