Gala Group (geology)

The Gala Group is a Silurian lithostratigraphic group (a sequence of rock strata) in the Southern Uplands of Scotland and northernmost England. The name is derived from Gala Water, a tributary of the River Tweed. The rocks of the Gala Group have also previously been known as the Queensberry Grits and the Strangford Group. Graded beds variously of wackestone, siltstone and mudstone are interpreted as turbidites and have been matched with the Central Belt turbidites which are seen in the Ards Peninsula in Northern Ireland. The strata are generally near-vertical and are bounded to the north by the Orlock Bridge Fault and to the south by the Laurieston Fault. Graptolites are found in a few beds.[1]

Gala Group Stratigraphic range: Rhuddanian - Telychian Silurian
Type	Group
Underlies	bounds Orlock Bridge Fault
Overlies	Moffat Shale Group (faulted boundary)
Thickness	c6000m
Lithology
Primary	turbidites
Location
Country	Scotland, England
Type section
Named for	Gala Water

References

1. "Gala Group". The BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved August 8, 2016.

• G.J. H. Oliver et al. The Geological Society (2002). Trewin, N.H. (ed.). The Geology of Scotland (4. ed.). London: Geological Society Publishing. pp. 187–188. ISBN 9781862391260.