| Computer Code: |
RDM |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Pridoli Epoch (SO)
— Pragian Age (DP) |
| Lithological Description: |
[Obsolete: use FWW] Red siltstones and mudstones with subordinate sandstones. Correlative of Red Marl Group is the Milford Haven Group. |
| Definition of Lower Boundary: |
Drawn at base of green-yellow sandstones of Green Beds where they rest unconformably on sandstones and siltstones of Ludlow age. |
| Definition of Upper Boundary: |
Drawn at conformable upward passage from red marls to green and red sandstone of the Senni Beds. |
| Thickness: |
1100m approx. |
| Geographical Limits: |
South Wales and Gloucestershire. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
Red Marl [Obsolete Name and Code: Use MMG, RDM]
(-4292)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
May Hills, Gloucestershire. |
| Reference(s): |
| Strahan, A and others, 1909. South Wales District-Pembrokeshire. Summary of Progress of the Geological Survey of Great Britain, for 1908, p.33. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E232
E246
E245
E244
E234
|
