| Computer Code: |
MALC |
Preferred Map Code: |
MCO |
| Status Code: |
Full |
| Age range: |
Early Devonian Epoch (DL)
— Early Devonian Epoch (DL) |
| Lithological Description: |
A fine- and coarse-grained, cobbly, poorly sorted, matrix supported conglomerate, with clasts of vein quartz, quartzite and some igneous lithologies, coarsening north-eastwards, and clast supported around Beinn Dearg. |
| Definition of Lower Boundary: |
A transitional contact with the siltstone facies of the undivided Cromlix Mudstone Formation, especially in the lower part where interbeds of siltstone, sandstone and conglomerate show a diffuse boundary. |
| Definition of Upper Boundary: |
A sharp contact with the siltstone facies of the undivided Cromlix Mudstone Formation, which is commonly seen as a pronounced topographical feature. |
| Thickness: |
About 120m at Beinn Dearg [NN 589 038]. 50 m near Malling, thinning south-westwards to about 15 m at Carse of Shannochill [NS 5385 9850], and to just 1m in Kelty Water [NS 4973 9504]. |
| Geographical Limits: |
The north-west limb of the Strathmore Syncline from Kelty Water to a ridge north-east of Ben Gullipen, probably equivalent to the conglomerate in Keltie Water, Callander, 500 m above the Bridge of Brackland. |
| Parent Unit: |
Cromlix Mudstone Formation (CXF)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Hillock at rear of Nether Shannochill. |
| Partial Type Section |
Bluff 100m north-west of Malling. |
| Reference Section |
Bluffs on south-east shore of Lochan Balloch. |
| Reference(s): |
| Phillips, E R, and Aitken, A M. 1998. The petrology and composition of the Lower Old Red Sandstone exposed in the Aberfoyle Area (Sheet 38E), Central Scotland. British Geological Survey, Technical Report, WG/98/10. |
| Browne, M A E, Smith, R A, and Aitken, A M. 2002. Stratigraphical framework for the Devonian (Old Red Sandstone) rocks of Scotland south of a line from Fort William to Aberdeen. British Geological Survey Research Report RR/01/04. 67 pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S038
|
