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): Strangford Group [Obsolete Name And Code: Use GALA] (STRN)
Queensberry Grits (-1552)
Gala Group (GALA)
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
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. 
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. 
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). 
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