| Computer Code: |
AULA |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Early Devonian Epoch (DL)
— Early Devonian Epoch (DL) |
| Lithological Description: |
Grey pyroxene andesite (British Geological Survey, 1987) or hornblende- and olivine andesite (Tyrrell, 1928) lava. |
| Definition of Lower Boundary: |
The top of the Auchencar Burn Sandstone Member. |
| Definition of Upper Boundary: |
The base of the Creag Mhor Conglomerate Member, or sandstone within the Auchencar Sandstone Formation. |
| Thickness: |
Up to 20 m thick, with an amygdaloidal upper zone. |
| Geographical Limits: |
Isle of Arran. |
| Parent Unit: |
Auchencar Sandstone Formation (AUSA)
|
| Previous Name(s): |
Auchencar Lava [Obsolete Name and Code: Use AULA, AUSA]
(-1959)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Friend, P F, Harland, W B and Hudson, J D, 1963. The Old Red Sandstone and the Highland Boundary in Arran, Scotland. Transactions of the Edinburgh Geological Society, Vol.19, 363-425. |
| Browne, M A E, Smith, R A, and Aitken, A M. 2002. Stratigraphical framework for the Devonian (Old Red Sandstone) rocks of Scotland south of a line from Fort William to Aberdeen. British Geological Survey Research Report RR/01/04. 67 pp. |
| British Geological Survey. 1987a. Arran Scotland Special Sheet. Bedrock. 1:50 000 Series (Southampton: Ordnance Survey for the British Geological Survey.) |
| Tyrrell, G W. 1928. The Geology of Arran. Memoir of the Geological Survey (Scotland). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
