The BGS Lexicon of Named Rock Units — Result Details

Darvel Lava Member

Computer Code: DLLA Preferred Map Code: notEntered
Status Code: Full
Age range: Visean Stage (CV) — Visean Stage (CV)
Lithological Description: The Darvel Lava Member consists of alkali basalts/ankaramites. Near the unit top trachybasalt also occurs.
Definition of Lower Boundary: The Darvel Lava Member is unconformable on older strata, the Swanshaw Sandstone Formation (Lower Devonian).
Definition of Upper Boundary: The Member is mainly overlain by the Kirkwood Formation of the Strathclyde Group. The contact is considered unconformable with the volcaniclastic sedimentary rocks draping an eroded land surface formed from the Member. Locally (east) it is interbedded with or overlain by the Gowkstane Pyroclastic Member.
Thickness: Not known.
Geographical Limits: Dunlop-Eaglesham moors between Glasgow, Kilmarkock and Hamilton, limited area around Darvel (NS 6000 4000) and Newmilns (NS 5000 3700) just north of the Inchgottrick Fault.
Parent Unit: Clyde Plateau Volcanic Formation (CPV)
Previous Name(s): Darvel Lavas (-2756)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Dunlop-Eaglesham moors between Glasgow, Kilmarnock and Hamilton, limited area around Darvel (NS 6000 4000) and Newmilns (NS 5000 3700) just north of the Inchgottrick Fault. 
Reference(s):
MacPherson, K A T and Phillips, E R. 1997. The geology of the Clyde Plateau Volcanic Formation of the Kilmarnock district (Sheet 22E), central Scotland. British Geological Survey Report, WA/97/88. 
MacPherson, K A T, Smith, R A and Akhurst, M C. 2000. Geology of the Kilmarnock district. Sheet description of the British Geological Survey 1:50 000 Sheet 22E Kilmarnock (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S022