The BGS Lexicon of Named Rock Units — Result Details

Threemile Formation

Computer Code: TML Preferred Map Code: TML
Status Code: Pending Upgrade
Age range: Onnian Substage (ON) — Onnian Substage (ON)
Lithological Description: Sandstone flysch.
Definition of Lower Boundary: Conformably overlies the Southshore Formation.
Definition of Upper Boundary: Conformably overlain by the Penwhapple Formation.
Thickness: 45 metres.
Geographical Limits: Not defined.
Parent Unit: Whitehouse Subgroup (WHE)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Area  Foreshore, south of Girvan, Sheet 5007. 
Harper, D A T, 1984. Brachiopods from the Upper Ardmillan succession (Ordovician) of the Girvan district, Scotland. Part 1. Monograph of the Palaeontographical Society, London. 1-78 (Publication No.565, part of Vol.136 for 1982). 
1:50K maps on which the lithostratigraphical unit is found, and map code used: