The BGS Lexicon of Named Rock Units — Result Details

High Mains Formation

Computer Code: HMS Preferred Map Code: HMS
Status Code: Full
Age range: Ashgill Series (OA) — Ashgill Series (OA)
Lithological Description: Fine- to medium-grained grey sandstone.
Definition of Lower Boundary: Conformably overlies the South Threave Formation of the DrummuckSubgroup.
Definition of Upper Boundary: Unconformably overlain by the Mulloch Hill Conglomerate (Silurian).
Thickness: 30m, thinning to zero
Geographical Limits: Craighead Inlier, Girvan area, southwest Scotland.
Parent Unit: Drummuck Subgroup (DKG)
Previous Name(s): High Mains Sandstone (-3474)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  High Mains Farm, Craighead Inlier, 10km north-east of Girvan. Sheet SO14W. Harper, 1981. 
Reference(s):
Lamont, A. 1935. The Drummuck Group, Girvan; A stratigraphical revision, with descriptions of new fossils from the lower part of the group. Transactions of the Geological Society of Glasgow, Vol.19, 288-334. 
Harper, D A T. 1981. The stratigraphy and faunas of the Upper Ordovician High Mains Formation of the Girvan district. Scottish Journal of Geology, Vol.17(4), 247-255. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S014