The BGS Lexicon of Named Rock Units — Result Details

Gala Unit 1

Computer Code: GAL1 Preferred Map Code: GALA1
Status Code: Full
Age range: Rhuddanian Age (SR) — Rhuddanian Age (SR)
Lithological Description: Graded beds that may include wacke sandstone, siltstone and mudstone in variable proportion, interpreted as turbidites. Rare interbedded mudstones have yielded fauna of the acuminatus Biozone.
Definition of Lower Boundary: Southern faulted boundary: Stair Haven Fault. Stratigraphical lower boundary with underlying Moffat Shale Group (of Ordovician to Silurian age).
Definition of Upper Boundary: Northern faulted boundary: Orlock Bridge Fault.
Thickness: c. 2000m of near vertical strata
Geographical Limits: Mapped from the eastern side of Luce Bay (Sheet 4W) to New Galloway (Sheet 9W). Possible correlation with the northern part of the Donaghadee Block of the Ards Peninsula, Northern Ireland.
Parent Unit: Gala Group (GALA)
Previous Name(s): Queensberry Grits (-1552)
Gala Group (GALA)
Alternative Name(s): Kilfillan Formation
Stratotypes:
Reference Section  Coastal exposure south of Glenluce on the east side of Luce Bay at Kilfillan Farm. Barnes, in prep. 
Reference(s):
Peach, B N and Horne, J. 1899. The Silurian Rocks of Britain, Volume 1. Scotland. Memoir of the Geological Survey of the United Kingdom. 
Stone, P, 1995. Geology of the Rhins of Galloway district. Memoir of the British Geological Survey, Sheets 1 & 3 (Scotland). 
Barnes, R P, (in prep). The geology of the Kirkcowan, Wigtown and Whithorn districts. Memoir of the British Geological Survey, Sheets 4W, 4E and 2 (Scotland). 
Barnes, R P, Anderson, T B and McCurry, J A. 1987. Along-strike variation in the stratigraphical and structural profile of the Southern Uplands Central Belt in Galloway and Longford Down. Journal of the Geological Society, 144, 807 - 816. 
McMillan, A A. 2002. Geology of the New Galloway and Thornhill District. 2002. Memoir of the British Geological Survey. Sheets 9W and 9E (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S001 S003 S004 S004 S008 S009 N29