| Computer Code: |
ABG |
Preferred Map Code: |
notEntered |
| Status Code: |
Full, pending ratification |
| Age range: |
Rawtheyan Stage (OW)
— Rawtheyan Stage (OW) |
| Lithological Description: |
Thickly-bedded, mottled, grey-blue mudstones, passing locally into well cleaved slates. |
| Definition of Lower Boundary: |
Drawn at the base of the Abercwmeiddaw Group where pale greyish blue, thickly bedded mudstones conformably rest upon black shales of the Nod Glas Formation. |
| Definition of Upper Boundary: |
Drawn at the conformable upward passage of the Abercwmeiddaw Group where mottled mudstones pass into blue mudstones with orange weathering of the Red Vein Formation. |
| Thickness: |
450 metres approx. |
| Geographical Limits: |
The district around Corris and Aberllefenni (Merionethshire). |
| Parent Unit: |
Not Entered (?)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Abercwmeiddaw Quarry, near Corris, Merioneth. |
| Reference(s): |
| Pugh, W J. 1923. The geology of the district around Corris and Aberllefenni, (Merionethshire). Quarterly Journal of the Geological Society, London, Vol.79, 508-541. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
