The BGS Lexicon of Named Rock Units — Result Details

Malling Conglomerate Member

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. 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