The BGS Lexicon of Named Rock Units — Result Details

South Threave Formation

Computer Code: STHV Preferred Map Code: STHV
Status Code: Full
Age range: Rawtheyan Stage (OW) — Rawtheyan Stage (OW)
Lithological Description: Bedded green mudstones, sandstones and siltstones, but with some units of unbedded grey silty mudstone.
Definition of Lower Boundary: Conformably overlies the Lady Burn Formation. Taken at the change from the massive, nodular pale grey largely unbedded silty mudstones of the Lady Burn Formation into the bedded green mudstone, sandstone and siltstone of the South Threave Formation.
Definition of Upper Boundary: Conformably overlain by the High Mains Formation. The boundary is taken at the change from bedded greyish-green muddy siltstone of the Waterfall Member of the South Threave Formation into the fine- to medium-grained grey sandstone of the High Mains Sandstone.
Thickness: 60m
Geographical Limits: Craighead Inlier, Girvan, southwest Scotland.
Parent Unit: Drummuck Subgroup (DKG)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Area  Craighead Inlier, (South Threave), SO14W. 
Type Section  South Threave Farm, Craighead Inlier, Girvan. Harper, 1962. 
Harper, D A T, 1982. The stratigraphy of the Drummock Group (Ashgill), Girvan. Geological Journal, Vol.17, p.251-277.l. 17 251-277 
1:50K maps on which the lithostratigraphical unit is found, and map code used: