| Computer Code: |
CWN |
Preferred Map Code: |
Cwn |
| Status Code: |
Full |
| Age range: |
Telychian Age (ST)
— Telychian Age (ST) |
| Lithological Description: |
Interbedded conglomerates, sandstones and turbidite mudstones with some thick units of pebbly mudstone. Subordinate thin laminated or burrowed hemipelagites. |
| Definition of Lower Boundary: |
Taken at base of first pebbly mudstone or conglomerate above the mudstone dominated sequence of the Rhayader Pale Shales. |
| Definition of Upper Boundary: |
Gradational but taken at base of mudstone dominated sequence with sparse thin turbidite sandstones of the Caeran Mudstones. |
| Thickness: |
Up to 150m. |
| Geographical Limits: |
Central Wales, northwest flank of Tywi Anticline. |
| Parent Unit: |
Not Available (!)
|
| Previous Name(s): |
Cwmbarn Member [Obsolete Name and Code: Use CWN]
(-3341)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Old Quarry at Cwmbarn, 120m southwest of Brynscolfa, Rhayader. |
| Reference(s): |
| none recorded or not applicable |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E179
|
