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 Unpublished PhD Thesis, University of Cambridge.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
|