The BGS Lexicon of Named Rock Units — Result Details

Creag Mhor Conglomerate Member

Computer Code: CMC Preferred Map Code: CMC
Status Code: Pending Upgrade
Age range: Early Devonian Epoch (DL) — Early Devonian Epoch (DL)
Lithological Description: A coarse conglomerate with boulders of mainly andesite lava, with predominantly quartzite boulders in the lower part.
Definition of Lower Boundary: The base of the lowest conglomeratic unit within the Auchencar Sandstone Formation or locally the Auchencar Lava Member.
Definition of Upper Boundary: The base of the Am Binnein Sandstone Formation.
Thickness: 270 m thick.
Geographical Limits: Isle of Arran.
Parent Unit: Auchencar Sandstone Formation (AUSA)
Previous Name(s): Creag Mhor Conglomerates (Formation) (-793)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Arran Special Sheet. 
Reference(s):
Friend, P F, Harland, W B and Hudson, J D, 1963. The Old Red Sandstone and the Highland Boundary in Arran, Scotland. Transactions of the Edinburgh Geological Society, Vol.19, 363-425. 
Browne, M A E, Smith, R A and Aitken, A M. 2001. A lithostratigraphical framework for the Devonian (Old Red Sandstone) rocks of Scotland south of a line from Fort William to Aberdeen. Version 3. British Geological Survey Research Report RR/01/04. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S338 S013