The BGS Lexicon of Named Rock Units — Result Details

Leswalt Formation [Obsolete Name And Code: Use CMSC]

Computer Code: LWT Preferred Map Code: LWT
Status Code: Index Level
Age range: Westphalian Stage (CW) — Westphalian Stage (CW)
Lithological Description: Grey, red and mottled yellow-brown sandstones interbedded with purple-grey shales containing plant fragments, and rare seatclays.
Definition of Lower Boundary: Angular unconformity over steeply inclined Lower Palaeozoic greywackes.
Definition of Upper Boundary: Unconformably overlain by Permian breccias.
Thickness: c.30m
Geographical Limits: Rhins of Galloway, south west Scotland.
Parent Unit: Scottish Coal Measures Group (CMSC)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Intermittently exposed in a narrow, north-south strip for 7km to the north and to the south (14 km in all) of Leswalt. Sheet S3 (Stranraer). 
Type Section  Lochans to Jamieson's Point, Rhins of Galloway. 
Reference(s):
Stone, P, 1995. Geology of the Rhins of Galloway district. Memoir of the British Geological Survey, Sheets 1 & 3 (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S001 S003