| Computer Code: |
BHLA |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Arundian Substage (CJ)
— Asbian Substage (CR) |
| Lithological Description: |
The Burnhouse Lava Member consists mainly of thin (2 to 3 m) plagioclase-macrophyric trachybasalt lavas (hawaiite of 'Markle' type), a few thin intercalated plagioclase-microphyric trachybasalt lavas (hawaiite of 'Jedburgh' type) and intercalated tuffs. The lavas are irregular in form, locally autobrecciated, commonly amygdaloidal and relatively decomposed, carbonated and heavily oxidised with much red veining. Associated pyroclastic rocks comprise a series of well-stratified, red-weathered lapilli-tuffs and tuff-breccias with blocks and bombs, commonly up to 0.5 m in diameter and composed of various macroporphyritic and microporphyritic lava types, scoria and 'cementstone' (pseudosparstone). The tuffs are typically intensely microfaulted and intruded by various dykes. The lavas have proximal-facies characteristics and two possible source necks have been identified, at [NS 682 825] and [708 824] on the basis of the coarseness of the tuffs (Craig, 1980). |
| Definition of Lower Boundary: |
The basal plagioclase-macrophyric trachybasalt of the Burnhouse Lava Member is unconformable on sandstone of the underlying Clyde Sandstone Formation. |
| Definition of Upper Boundary: |
The Burnhouse Lava Member is overlain conformably, or disconformably by the Campsie Lava Member. The change in lithology is to mainly plagioclase-microphyric basalt lavas (of 'Jedburgh' type). |
| Thickness: |
20 m |
| Geographical Limits: |
The member is restricted to the Campsie Block and specifically to the central Kilsyth Hills, north-east of Glasgow. |
| Parent Unit: |
Clyde Plateau Volcanic Formation (CPV)
|
| Previous Name(s): |
Burnhouse Lavas
(-55)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Central Kilsyth Hills, north-east of Glasgow. Forsyth et al., 1996, after Craig, 1980. |
| Reference Section |
Burnhouse Burn, Central Kilsyth Hills, north-east of Glasgow. Craig, 1980. |
| 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. |
| 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 Unpublished PhD thesis, University of Lancaster.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
|
