The BGS Lexicon of Named Rock Units — Result Details

Tormitchell Conglomerate Member

Computer Code: TMS Preferred Map Code: TMS
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Coarse, buff-weathering, medium-grey pebbly grit with scattered boulders of dolerite, spilite lava and red granite. Some intercalated mudstones and siltstones yielding a brachiopod fauna.
Definition of Lower Boundary: Discrete lenticular pebbly and conglomeratic member within the flaggy sandstones, siltstones and mudstones of the Ardwell Farm Formation and located about 150m above the base of the formation.
Definition of Upper Boundary: Discrete lenticular pebbly and conglomeratic member within the flaggy sandstones, siltstones and mudstones of the Ardwell Farm Formation and located about 150m above the base of the formation.
Thickness: 0 to 73m
Geographical Limits: Girvan area, southwest Scotland.
Parent Unit: Ardwell Farm Formation (ARD)
Previous Name(s): Tornmitchel Conglomerate (-1236)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Girvan area. Williams, 1962. 
Reference(s):
Fortey, R A, Harper, D A T, Ingham, J K, Owen, A W, Parkes, M A, Rushton, A W A and Woodcock, N H. 2000. A revised correlation of Ordovician rocks in the British Isles. Geological Society Special Report, No.24. 
Williams, A, 1962. The Barr and Lower Ardmillan Series (Caradoc) of the Girvan district, southwest Ayrshire, with descriptions of the Brachiopoda. Memoir of the Geological Society of London, No.3. 
Lapworth, C, 1882. The Girvan Succession. Quarterly Journal of the Geological Society of London, Vol. 38, 537-666. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable