Computer Code: |
BELA |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Arundian Substage (CJ)
— Asbian Substage (CR) |
Lithological Description: |
Olivine-microphyric basalts (Dalmeny type). Red boles are common between flows and interbedded chocolate-coloured marls are present. Large parts of the flows are extensively altered and decomposed. South of Roebank Glen [2353 6554] a flow of plagioclase-macrophyric basalt (Markle type) outcrops within the member. |
Definition of Lower Boundary: |
Underlain by the Markle- and Dunsapie-type basalts of the Fereneze Lava Member. |
Definition of Upper Boundary: |
Overlain by volcaniclastic sedimentary rocks of the Kirkwood Formation wherever the top of the member crops out. |
Thickness: |
About 90 m. |
Geographical Limits: |
The unit occurs to the west and south-west of the Beith-Barhead Hills. The unit underlies the town of Beith [NS 35 54] and extends north east to just north of East Gavin [NS 389 599]. |
Parent Unit: |
Clyde Plateau Volcanic Formation (CPV)
|
Previous Name(s): |
Beith Lavas [Obsolete Name and Code: Use BELA]
(-3840)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Reference Section |
Crummock Park borehole penetrated the lowest 50 m of the Beith Lava Member, Monro 1999. A detailed geological log (NS35SE/1) is available in BGS borehole records. |
Type Area |
The Beith Lava Member crops out on lower slopes at the south-western limit of the Beith-Barrhead Hills, Monro 1999. |
Reference(s): |
Paterson, I B, Hall, I H S and Stephenson, D. 1990. Geology of the Greenock district: Memoir for 1:50000 geological sheet 30W and part of sheet 29E (Scotland). |
Richey, J E, Anderson, E M, and Macgregor, A G. 1930.The geology of north Ayreshire. Memoir of the Geological Survey of Great Britain. |
Monro, S K. 1999. Geology of the Irvine District. Memoir of the British Geological Survey, Sheet 22W and part of 21E (Scotland). |
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. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
S022
S030
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