| Computer Code: |
BEI |
Preferred Map Code: |
BEI |
| Status Code: |
Index Level |
| Age range: |
Longvillian Substage (OL)
— Longvillian Substage (OL) |
| Lithological Description: |
[Obsolete: use CEI] Green calcareous, volcaniclastic, planar to low-angle cross-bedded fine- to medium-grained sandstone. Multiple shell coquinas. |
| Definition of Lower Boundary: |
Base of sandstone overlies grey siltstones and fine-grained sandstones of the Carn y Parc Formation. |
| Definition of Upper Boundary: |
Top of sandstone overlain by yellowish-grey sandy siltstones of the Eidda Formation. |
| Thickness: |
Thickness in type section - 2 metres; thickness in lateral variations - 0-2 metres. |
| Geographical Limits: |
Not defined. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Corwen 120. |
| Reference(s): |
| Campbell, S D G. 1983. The geology of an area between Bala and Betws-y-Coed, North Wales. Unpublished PhD Thesis, University of Cambridge. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E120
|
