The BGS Lexicon of Named Rock Units — Result Details

Protovirgularia Grits Formation

Computer Code: PRO Preferred Map Code: PRO
Status Code: Full
Age range: Llandovery Epoch (SL) — Llandovery Epoch (SL)
Lithological Description: Grey-green, gritty sandstone and shale.
Definition of Lower Boundary: Conformably overlies the Penkill Formation.
Definition of Upper Boundary: Conformably overlain by the Lauchlan Mudstone Formation.
Thickness: 165 m thick.
Geographical Limits: Girvan area, south-west Scotland.
Parent Unit: Dailly Subgroup (DAI)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Lauchlan Burn (upper 60m of formation). 
Partial Type Section  Penwhapple Burn, Girvan, Sheet SO08W, (lower 90m of formation). 
Reference(s):
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:
S008