The BGS Lexicon of Named Rock Units — Result Details

Gala Unit 2

Computer Code: GAL2 Preferred Map Code: GALA2
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: Sandhead Fault. Stratigraphical lower boundary with underlying Moffat Shale Group (of Ordovician to Silurian age).
Definition of Upper Boundary: Northern faulted boundary Luce Bay to New Galloway: Stair Haven Fault. East of New Galloway: Orlock Bridge Fault.
Thickness: c. 1000m of near vertical strata
Geographical Limits: Mapped from the Sandhead on the Rhins of Galloway (Sheet 1/3) to Peebleshire (Sheet 24E). Correlation with Central Belt turbidites of Llandovery age in the Ards Peninsula, Northern Ireland.
Parent Unit: Gala Group (GALA)
Previous Name(s): Queensberry Grits (-1552)
Pyroxenous Greywacke Group (-1553)
Gala Group (GALA)
Alternative Name(s): Mindork Formation
Stratotypes:
Reference Section  Mindork Fell, 3 km. SSW of Kirkcowan. 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. 
Lapworth, C, 1871. On the Lower Silurian rocks in the neighbourhood of Galashiels. Transactions of the Edinburgh Geological Society, 2, 46 - 58. 
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). 
Walton, E K. 1955. Silurian greywackes in Peeblesshire. Proceedings of the Royal Society of Edinburgh, B65, 327-357. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S001 S003 S004 S004 S009 S009 S016 S024 S024 N29 S015