The BGS Lexicon of Named Rock Units — Result Details

Glenwells Shale Formation

Computer Code: GWSH Preferred Map Code: GWSH
Status Code: Full
Age range: Rhuddanian Age (SR) — Rhuddanian Age (SR)
Lithological Description: Hard, light and dark grey, laminated mudstones and siltstones with a graptolite fauna.
Definition of Lower Boundary: Conformably overlies the Mulloch Hill Sandstone Formation (MLHS).
Definition of Upper Boundary: Conformably overlain by the Glenwells Conglomerate Formation (GWC).
Thickness: About 97 m thick.
Geographical Limits: Craighead Inlier, Girvan.
Parent Unit: Newlands Subgroup (NEWL)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Section  Glenwells Burn, Craighead Inlier, Girvan. Cocks & Toghill, 1973. 
Floyd, J D and Williams, M. 2003. A revised correlation of Silurian rocks in the Girvan district, SW Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol. 93 (for 2002), 383-92. 
Freshney, E C. 1959. An extension of the Silurian succession in the Craighead Inlier, Girvan. Transactions of the Geological Society of Glasghow, Vol. 24, 27-31. 
Cocks, L R M and Toghill, P, 1973. The biostratigraphy of the Silurian rocks of the Girvan District, Scotland. Journal of the Geological Society of London, Vol. 129, 209-243. 
Lapworth, C, 1882. The Girvan Succession. Quarterly Journal of the Geological Society of London, Vol. 38, 537-666. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: