| Computer Code: |
ABMR |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Arenig Series (OR)
— Arenig Series (OR) |
| Lithological Description: |
Dark, laminated graptolitic mudstones, with interbedded rhyolitic turbiditic tuffs and debrites. |
| Definition of Lower Boundary: |
Not seen. |
| Definition of Upper Boundary: |
Conformably overlain by the Porth Lauog Formation, the boundary being taken at the first debrite incutsion into the black mudstones. |
| Thickness: |
More than 215m |
| Geographical Limits: |
Ramsey Island, Pembrokeshire. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
Aber Mawr Beds [Obsolete Name and Code: Use ABMR]
(-3785)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Aber Mawr Bay, Ramsey Island. Kokelaar et al, 1985. |
| Reference(s): |
| Kokelaar, B P, Bevins, R E and Roach, R A. 1985. Submarine silicic volcanism and associated sedimentary and tectonic processes, Ramsey Island, south west Wales. Journal of the Geological Society of London, Vol.142 (4-6), 591-617. |
| Pringle, J. 1930. The geology of Ramsey Island (Pembrokeshire). Proceedings of the Geologists' Association, Vol.41, 1-31. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E209
|
