| Computer Code: |
KHLA |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Arundian Substage (CJ)
— Asbian Substage (CR) |
| Lithological Description: |
The Kilsyth Hills Lava Member consists predominantly of plagioclase-macrophyric basalts and trachybasalts (hawaiites of 'Markle' type). The lower of these lavas tend to have sparse and small plagioclase phenocrysts and are transitional to plagiclase-microphyric basalts and trachybasalts (hawaiities of 'Jedburgh' type). Some higher lavas in the sequence are olivine-augite-plagioclase-macrophyric basalts (of 'Dunsapie' type). Also, there is a local intercalation of variably olivine-plagioclase-microphyric basalt lava (of 'Jedburgh' to 'Dalmeny' type). The member is equivalent laterally to the Denny Muir Lava Member which is recognised to the east of the Tak-ma-doon Fault. The lavas were thought by Craig (1980) to have been derived from the Waterhead Centre ('Waterhead Central Volcanic Complex'). |
| Definition of Lower Boundary: |
Over most of its outcrop, the base is conformable or disconformable on basaltic-trachyandesite (mugearite) and/or trachybasalt (hawaiite) of the Upper Lecket HIll Lava Member, but towards the south-east, the member rests unconformably on progressively older members, including the Lower Lecket Hill Lava Member, the lower south Campsie lavas (Campsie Lava Member) and the Tappetknowe Lava Member. |
| Definition of Upper Boundary: |
The Kilsyth Hills Lava Member occupies summit areas across its outcrop and the top of the member has been eroded. |
| Thickness: |
More than 160 m, top eroded. |
| Geographical Limits: |
The member is restricted to the Campsie Block and specifically to the central Kilsyth Hills west of the Tak-ma-doon Fault, north-east of Glasgow. |
| Parent Unit: |
Clyde Plateau Volcanic Formation (CPV)
|
| Previous Name(s): |
Kilsyth Hills Lavas
(-993)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Crags on the southern flanks of Tomtain Hill, central Kilsyth Hills, north-east of Glasgow. Craig, 1980. |
| Type Area |
Central Kilsyth Hills, north-east of Glasgow. Forsyth et al., 1996, after Craig, 1980. |
| Reference(s): |
| Craig, P M. 1980. The Volcanic Geology of the Campsie Fells area, Stirlingshire. Unpublished PhD thesis, University of Lancaster. |
| Forsyth, I H, Hall, I H S and McMillan, A A. 1996. Geology of the Airdrie district. Memoir of the British Geological Survey, Sheet 31W (Scotland). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S031
|
