The Ardvreck Group is a stratigraphic group of early Cambrian age found in the Northwest Highlands of Scotland. It lies unconformably on gneisses of the Lewisian complex or sandstones of the Torridon Group. It consists of two formations, the basal quartzites and quartz arenites of the Eriboll Formation and the overlying dolomitic siltstones and sandstones and quartz arenites of the An-t-Sron Formation. It is overlain conformably by the Ghrudaidh Formation of the Durness Group. The Ardvreck Group was at one time known as the "Eriboll Group".[1]

Ardvreck Group
Stratigraphic range: Lower Cambrian
Quartz arenite with skolithos burrows, the Pipe Rock of the upper Eriboll Formation, viewed on a bedding surface
TypeGroup
Sub-unitsEriboll Formation, An-t-Sron Formation
UnderliesDurness Group
OverliesLewisian complex or Torridon Group
Thicknessup to 142 m
Lithology
Primaryquartzite, quartz arenite
Location
RegionHebridean Terrane
CountryScotland
ExtentNorthwest Highlands
Type section
Named forArdvreck Castle

References

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  1. ^ British Geological Survey. "Ardvreck Group". BGS Lexicon of Named Rock Units. Retrieved 2018-03-09.