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 [Obsolete Name and Code: Use CMVC]
(-148)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Area |
Gully 300m south-west of Craig of Monievreckie. |
Reference Section |
Shoreline of Lake Venachar, north of Tom Eoghainn. |
Reference Section |
Forestry Commission quarry, 400 m east-south-east of Maol Ruadh. |
Reference(s): |
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). |
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: |
S038
S039
|