Computer Code: |
ABM |
Preferred Map Code: |
AbM |
Status Code: |
Pending Upgrade |
Age range: |
Arenig Series (OR)
— Abereiddian Stage (O2) |
Lithological Description: |
Dark grey mudstones locally with interbedded tuffs. |
Definition of Lower Boundary: |
Not defined. |
Definition of Upper Boundary: |
Not defined. |
Thickness: |
c.400M |
Geographical Limits: |
1:50,000 Sheet 209 (St. Davids) and adjacent Sheet 210. |
Parent Unit: |
Not Applicable (-)
|
Previous Name(s): |
Bifidus Shales
(-627)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
none recorded or not applicable |
Reference(s): |
Hicks, H. 1875. The physical conditions under which the Cambrian and Lower Silurian rocks were probably deposited over the European area. Quarterly Journal of the Geological Society, Vol.31, p.552. |
Hughes C P, and others. 1982. Abereiddi Bay and the adjacent coast. "In" Bassett, M G. (Editor). Geological excursions in Dyfed, south-west Wales. p.51-63. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E209
E230
E244
E245
E210
|