The BGS Lexicon of Named Rock Units — Result Details

Loch Fad Conglomerate Formation

Computer Code: LFC Preferred Map Code: LFC
Status Code: Full
Age range: Arenig Series (OR) — Caradoc Series (O4)
Lithological Description: A coarse conglomerate with clasts up to 1m, but more commonly in the 10-50 cm range, consisting mainly of gritty sandstone but with rare serpentinite, chert and 'epidiorite'. The sandy matrix and sporadic sandstone interbeds are strongly cleaved.
Definition of Lower Boundary: Not seen, as the formation is a fault-bounded slice within the Highland Boundary Fault system.
Definition of Upper Boundary: Not seen, as the formation is a fault-bounded slice within the Highland Boundary Fault system.
Thickness: At least 200 m thick.
Geographical Limits: The eastern shore of Loch Fad, Isle of Bute, Scotland, restricted to 1:50 k sheet 29E, Dunoon.
Parent Unit: Highland Border Complex (HBX)
Previous Name(s): Schistose Conglomerate (-3521)
Loch Fad Conglomerate (-2289)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  The central part of the eastern shore of Loch Fad, Bute. Anderson, 1946. 
Reference(s):
Anderson, J G C. 1946. The Geology of the Highland Border: Stonehaven to Arran. Transactions of the Royal Society of Edinburgh, Vol.61, 479-515. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S029 S029