The BGS Lexicon of Named Rock Units — Result Details

Gala Group

Computer Code: GALA Preferred Map Code: GALA
Status Code: Full
Age range: Rhuddanian Age (SR) — Telychian Age (ST)
Lithological Description: Graded beds that may include wacke sandstone, siltstone and mudstone in variable proportions, interpreted as turbidites. Rare interbedded graptolite-bearing beds.
Definition of Lower Boundary: Southern faulted boundary: Laurieston Fault. Stratigraphical lower boundary with underlying Moffat Shale Group [of Ordovician to Silurian (gracilis to sedwickii biozones) age.]
Definition of Upper Boundary: Northern faulted boundary: Orlock Bridge Fault.
Thickness: c. 6000m of near-vertical strata.
Geographical Limits: Mapped from the Rhins of Galloway (Sheet 1/3) to Eyemouth (Sheet 34). Correlation with Central Belt turbidites of Llandovery age in the Ards Peninsula, Northern Ireland.
Parent Unit: Not Applicable (-)
Previous Name(s): Queensberry Grits (-1552)
Gala Group (GALA)
Strangford Group [Obsolete Name And Code: Use GALA] (STRN)
Alternative Name(s): none recorded or not applicable
none recorded or not applicable
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. 
Lapworth, C and Wilson, J. 1871. On the Silurian rocks in the counties of Roxburgh and Selkirk. Geological Magazine, Vol.8, 456-464. 
Stone, P, 1995. Geology of the Rhins of Galloway district. Memoir of the British Geological Survey, Sheets 1 & 3 (Scotland). 
Lapworth, C, 1871. On the Lower Silurian rocks in the neighbourhood of Galashiels. Transactions of the Edinburgh Geological Society, 2, 46 - 58. 
Walton, E K. 1955. Silurian greywackes in Peeblesshire. Proceedings of the Royal Society of Edinburgh, B65, 327-357. 
McMillan, A A. 2002. Geology of the New Galloway and Thornhill District. 2002. Memoir of the British Geological Survey. Sheets 9W and 9E (Scotland). 
Peach, B N and Horne, J. 1899. The Silurian Rocks of Britain, Volume 1. Scotland. Memoir of the Geological Survey of the United Kingdom. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S001 S003 S004 S004 S005 S008 S009 S009 S015 S016 S017 S024 S024 S025 S033 S033 S034 N29 S016 S016 S025 S017 S017 S025