Computer Code: |
CDAL |
Preferred Map Code: |
DALL |
Status Code: |
Full |
Age range: |
Early Devonian Epoch (DL)
— Early Devonian Epoch (DL) |
Lithological Description: |
Conglomerate, grey to greyish purple, dominantly of weathered rhyolite and basalt clasts, sandstone, volcaniclastic, very coarse-grained and pebbly to medium-grained, thin reddish brown mudstones. |
Definition of Lower Boundary: |
Abrupt transition from preceeding Ballyagan Formation by appearance of conglomerates and increase in volcaniclastic detritus. |
Definition of Upper Boundary: |
Probable faulted contact with Cushendall Porphyry although it has been suggested there is evidence of a flow-foot breccia and that the porphyry is thus extrusive. |
Thickness: |
0-200m (0-656ft). |
Geographical Limits: |
Northeast County Antrim between Cushendun and Cushendall on the southeast flank of Cross Slieve. |
Parent Unit: |
Cross Slieve Group (CSSL)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
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Stratotypes: |
Reference Section |
Shoreface cliffs and outcrops on the southeast side of Cross Slieve extending south from Port Obe to Salmon Rock at the north side of Cushendall Bay. Irish Grid |
Reference(s): |
Simon, J B. 1984. Provenance and depositional history of the Lower Old Red Sandstone of northeast Antrim. Irish Journal of Earth Sciences 6, 213-228. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
N14
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