| Computer Code: |
CRMU |
Preferred Map Code: |
CM |
| Status Code: |
Full |
| Age range: |
Rawtheyan Stage (OW)
— Rawtheyan Stage (OW) |
| Lithological Description: |
Brown-grey and green siliceous mudstones. |
| Definition of Lower Boundary: |
Disconformally overlies the dark grey graptolitic mudstones of the Nod Glas Formation. |
| Definition of Upper Boundary: |
Not present in the area. |
| Thickness: |
600m+ |
| Geographical Limits: |
Area around Pwllheli, northwest Wales. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
Crugan Mudstones [Obsolete Name and Code: Use CRMU]
(-3329)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Crugan Lane Quarry, near Pwllheli. |
| Reference(s): |
| Price, D, 1981. Ashgill trilobite faunas from the Llyn Peninsula, North Wales, UK. Geological Journal, 16, 201-216. |
| Matley, C A, 1938. The geology of the country around Pwllheli, Llanbedrog and Madryn, southwest Carnarvonshire. Quarterly Journal of the Geological Society of London, Vol.94, 555-606. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E134
|
