Yesnaby Sandstone Group

The Yesnaby Sandstone Group is a Devonian lithostratigraphic group (a sequence of rock strata) in west Mainland Orkney, Scotland. The name is derived from the locality of Yesnaby where the strata are exposed in coastal cliffs.

Outcrops
These strata are only exposed on either side of the Garthna Geo Fault in the Yesnaby area of west Mainland, Orkney.

Lithology and stratigraphy
The Group comprises the Qui Ayre Sandstone and the Harra Ebb Sandstone. The basal beds are talus and alluvial fan facies deposited in a fluvial or lake marginal environment probably during the Emsian Stage of the Devonian Period.