# Ardvreck Group

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The **Ardvreck Group** is a [stratigraphic group](/source/Group_(stratigraphy)) of early [Cambrian](/source/Cambrian) age found in the [Northwest Highlands](/source/Northwest_Highlands) of [Scotland](/source/Scotland). It lies [unconformably](/source/Unconformity) on [gneisses](/source/Gneiss) of the [Lewisian complex](/source/Lewisian_complex) or sandstones of the [Torridon Group](/source/Torridon_Group). It consists of two formations, the basal [quartzites](/source/Quartzite) and [quartz](/source/Quartz) [arenites](/source/Arenite) of the [Eriboll formation](/source/Eriboll_formation) and the overlying dolomitic siltstones and sandstones and quartz arenites of the [An-t-Sron formation](/source/An-t-Sron_formation). It is overlain conformably by the [Ghrudaidh formation](/source/Ghrudaidh_formation) of the [Durness Group](/source/Durness_Group). The Ardvreck Group was at one time known as the "Eriboll Group".[1]

## References

1. [British Geological Survey](/source/British_Geological_Survey). ["Ardvreck Group"](http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=ARDV). *BGS Lexicon of Named Rock Units*. Retrieved 2018-03-09.

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