| Computer Code: |
ACLA |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Arundian Substage (CJ)
— Asbian Substage (CR) |
| Lithological Description: |
Plagioclase-microphyric basalts (Jedburgh type). Some mugearite and interbedded cone-facies tuffs. On the Langs Craigs [2430 6760] there is an olivine-clinopyroxene-macrophyric basalt lava (Craiglockhart type). |
| Definition of Lower Boundary: |
In the area around Saughen Braes [NS 462 783] the Auchineden Lava Member is underlain by, and interdigitates with, the Saughen Braes Lava Member. To the north and west of the outcrop, the Auchineden Lava Member is directly underlain by the Burncrooks Volcaniclastic Member. |
| Definition of Upper Boundary: |
The Auchineden Lava Member is overlain by the plagioclase-macrophyric lavas of the Carbeth Lava Member. |
| Thickness: |
0-100 m very variable. Thins out to north-east and south-west. |
| Geographical Limits: |
Well exposed on the west flank of Auchineden Hill [NS 493 805] in the Kilpatrick Hills, north-west of Glasgow. The Auchineden Lava Member thins out towards the north-east and is absent at Arlehaven [NS 535 802]. West of Burncrooks [NS 468 785] it interdigitates with and overlies the Saughen Braes Lava Member and farther west, on Langs Craigs [NS 430 760], it completely replaces the Saughen Braes Member. |
| Parent Unit: |
Clyde Plateau Volcanic Formation (CPV)
|
| Previous Name(s): |
Auchineden Lavas [Obsolete Name and Code: Use ACLA]
(-4419)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Well exposed on the west flank of Auchineden Hill [NS 493 805]. Hall et al., 1998. |
| Reference Section |
The Auchineden Lava Member was encountered in the Loch Humphrey Borehole. Here it is 45 m thick and lies below the Carbeth Lava Member and above the Burncrooks Volcaniclastic Member. It consists of mainly non-porphyritic and micro-porphyritic lavas of Jedburgh type with a flow of Markle type. A geological description of the core is available in BGS borehole records. |
| Reference(s): |
| Dean, M T, Browne, M A E, Waters, C N and Powell, J H. 2011. A lithostratigraphical framework for the Carboniferous successions of northern Great Britain (onshore). British Geological Survey Research Report, RR/10/007. 165pp. |
| Hall, I H S, Browne, M A E and Forsyth, I H. 1998. Geology of the Glasgow district. Memoir of the British Geological Survey, Sheet 30E (Scotland). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S030
|
