The BGS Lexicon of Named Rock Units — Result Details

Castle Formation

Computer Code: CASL Preferred Map Code: CASL
Status Code: Full
Age range: Wenlock Epoch (SW) — Wenlock Epoch (SW)
Lithological Description: Thick beds of very fine-grained greywacke, interbedded with grey siltstone.
Definition of Lower Boundary: Base of lowest thick silt grade greywacke bed on sandstone grade greywacke/siltstone sequence of Patrick Burn Formation.
Definition of Upper Boundary: Base of overlying dark grey mudstone of Kip Burn Formation.
Thickness: 25m
Geographical Limits: Muirkirk to Strathaven area, Strathclyde region, central Scotland.
Parent Unit: Priesthill Group [Cf Hagshaw Group] (PRH)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Stream section near 'Shank's Castle'. 
Reference(s):
Paterson, I B, McAdam, A D and MacPherson, K A T. 1998. Geology of the Hamilton district. Memoir of the British Geological Survey, Sheet 23W (Scotland). 
Jennings, J S. Not published. The geology of the eastern part of the Lesmahagow Inlier. Ph.D.Thesis, University of Edinburgh, 1961. 
Walton, E K, 1965. "In" Craig, G Y, (Editor). The Geology of Scotland: Lower Palaeozoic rocks. Oliver and Boyd, Edinburgh, 161-227. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S023