Computer Code: |
MAE |
Preferred Map Code: |
MAE |
Status Code: |
Full |
Age range: |
Ashgill Series (OA)
— Ashgill Series (OA) |
Lithological Description: |
[Obsolete: use MFN] Grey to bluish grey siltstones with subordinate grey, light grey, yellow and white fine-grained sandstones and siltstone laminae which are parallel or ripple-laminated. Bioturbated. Rare macrofauna. Includes Dinas Sandstone Member at top of formation. |
Definition of Lower Boundary: |
Unconformable on various Caradoc Formations. |
Definition of Upper Boundary: |
The Dinas Sandstone Member is overlain by pale grey siltstones of the Bettws Mudstone or Bron-y-Graig Formations. |
Thickness: |
1600 metres. Lateral variations, 1000 metres - 1600 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 Sheet 120. |
Reference(s): |
Alder, K E. 1976. The geology of an area around Bettws Gwerfil Goch and Melin-y-Wig. Unpublished PhD Thesis, University of Cambridge. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E120
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