The BGS Lexicon of Named Rock Units — Result Details

Craig Of Monievreckie Conglomerate Formation

Computer Code: CMVC Preferred Map Code: CMV
Status Code: Full
Age range: Early Devonian Epoch (DL) — Early Devonian Epoch (DL)
Lithological Description: A clast supported conglomerate, with some bimodal sorting seen as generally massive volcanic clasts near the base of the unit, giving way to quartzite and psammite upwards and south-westwards along strike. Subsidiary sandstones include the Bofrishlie Burn Sandstone member, located below the basaltic Balleich Lava Member.
Definition of Lower Boundary: A faulted contact to the north-east of Aberfoyle.
Definition of Upper Boundary: A pronounced diachronous transitional contact with the conglomeratic or sandstone facies of the Ruchill Flagstone Formation.
Thickness: Up to 1200 m thick.
Geographical Limits: The north-west limb of the Strathmore Syncline, from Maol Ruadh to north of Callander.
Parent Unit: Arbuthnott-Garvock Group (ATGK)
Previous Name(s): Volcanic Conglomerates (-148)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Gully 300m south-west of Craig of Monievreckie. 
Reference Section  Forestry Commission quarry, 400 m east-south-east of Maol Ruadh. 
Reference Section  Shoreline of Lake Venachar, north of Tom Eoghainn. 
Reference(s):
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. 
Francis, E H, Forsyth, I H, Read, W A and Armstrong, M. 1970. The geology of the Stirling district. Memoir of the Geological Survey of Great Britain, Sheet 39 (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S038 S039