The BGS Lexicon of Named Rock Units — Result Details

Middlefield Conglomerate Formation

Computer Code: MFD Preferred Map Code: MFD
Status Code: Full
Age range: Wenlock Epoch (SW) — Wenlock Epoch (SW)
Lithological Description: Boulder conglomerate with well rounded quartzite, quartz, jasper, and igneous rock clasts, and sandstone with beds of conglomerate.
Definition of Lower Boundary: Unconformable contact of conglomerate on sandstones and siltstone of Logan Formation.
Definition of Upper Boundary: Top of highest important conglomerate bed below Plewlands Sandstone.
Thickness: 250m
Geographical Limits: Muirkirk to Strathaven area, Strathclyde region, Central Scotland.
Parent Unit: Dungavel Group (DGL)
Previous Name(s): Quartzite Conglomerate (QZT)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Gorge along Spindle Burn. 
Reference(s):
Walton, E K, 1965. "In" Craig, G Y, (Editor). The Geology of Scotland: Lower Palaeozoic rocks. Oliver and Boyd, Edinburgh, 161-227. 
Jennings, J S. Not published. The geology of the eastern part of the Lesmahagow Inlier. Ph.D.Thesis, University of Edinburgh, 1961. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S023