| Computer Code: |
DD |
Preferred Map Code: |
Dd |
| Status Code: |
Full |
| Age range: |
Ashgill Series (OA)
— Ashgill Series (OA) |
| Lithological Description: |
Interbedded conglomerates, sandstones, pebbly mudstones and mudstones. |
| Definition of Lower Boundary: |
Taken at base of first thick bed of conglomerate, sandstone or pebbly mudstone. Sharp. |
| Definition of Upper Boundary: |
Taken at top of last thick bed of conglomerate, sandstone or pebbly mudstone. Upper boundary gradational where overlain by further Nantmel Formation strata or sharp where overlain by Yr Allt Formation. |
| Thickness: |
Up to 450m. |
| Geographical Limits: |
Central Wales. |
| Parent Unit: |
Nantmel Mudstones Formation (NTM)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Road section on A470 opposite Doldowlod House and north of Newbridge on Wye. |
| Reference(s): |
| none recorded or not applicable |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E179
|
