| Computer Code: |
POG |
Preferred Map Code: |
PoG |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Massive vitroclastic and lithic-rich lapilli tuff and tuff of acid andesite/dacite composition. |
| Definition of Lower Boundary: |
Lower boundary not exposed in detail; taken at upward change from dominantly andesite to volcaniclastic deposits, within the Eycott Volcanic Group |
| Definition of Upper Boundary: |
Overlain unconformably by Carboniferous strata |
| Thickness: |
800m+ |
| Geographical Limits: |
Northern flanks of Caldbeck Fells from Branthwaite Beck (NY301 367) to just west of Birket (NY329 363). |
| Parent Unit: |
Eycott Volcanic Group (EVG)
|
| Previous Name(s): |
Potts Ghyll Formation [Obsolete Name and Code: Use POG]
(-4262)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Gill Beck, 500m upstream from Potts Ghyll (2.5 km SSW of Caldbeck) |
| Reference(s): |
| Millward, D, Carruthers, R M, Marriner, G F, Molyneux, S G, and Beddoe-Stephens, B. 1999. The Eycott Volcanic Group. British Geological Survey Technical Report, WA/99/68. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E023
|
