| Computer Code: |
SHEB |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Arundian Substage (CJ)
— Asbian Substage (CR) |
| Lithological Description: |
The Shelloch Burn Lava Member consists of a varied assemblage of lavas including: trachybasalt, basaltic trachyandesite (mugearite), microporphyritic basalt (of Jedburgh' type); plagioclase-macrophyric basalt (of 'Markle' type); and transitional plagioclase-microphyric to plagioclase-macrophyric basalts. The lavas are variably massive to locally platy jointed, slaggy and vesicular, dull red 'boles' are common and a lava tube has been observed. |
| Definition of Lower Boundary: |
The basal trachbasalt lava of the member is conformable or disconformable on the underlying plagioclase-microphyric basalts of the Spout of Ballochleam Lava Member. |
| Definition of Upper Boundary: |
The member is overlain unconformably by the Fintry Hills Lava Member. The lithological change is from basaltic trachyandesite (mugearite) or trachybasalt to plagioclase-microphyric basalt. |
| Thickness: |
40-61 m |
| Geographical Limits: |
The member is restricted to the Fintry Hills, north-east of Glasgow. These rocks crop out from around Stronend [NS 6290 8946] in the north-west of the Fintry Hills towards the east, in the Boquhan Burn and its headwaters ([NS 6388 8988] to [NS 6490 8965]) and the Shalloch Burn ([NS 6513 8920] to [NS 6541 8939]), and south-east to the Balmenoch Burn ([NS 6465 8771] to [NS 6464 8753]) and beyond, although the limits of the member to the south-east are uncertain. |
| Parent Unit: |
Clyde Plateau Volcanic Formation (CPV)
|
| Previous Name(s): |
Shelloch Burn Group [Obsolete Name and Code: Use SHEB]
(-3672)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
In the Fintry Hills, north-east of Glasgow. Francis et al., 1970. |
| Reference Section |
Crags forming the western edge of the Fintry Hills, north-east of Glasgow. Francis et al., 1970. |
| 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. |
| Francis, E H, Forsyth, I H, Read, W A and Armstrong, M. 1970. The geology of the Stirling district. Memoir of the Geological Survey of Great Britain, Sheet 39 (Scotland). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S039
|
