2011
HY2428 : Lamprophyre dyke cuts through sandstone
taken 14 years ago, near to Lower Palace, Mainland, Orkney Islands, Scotland

Lamprophyre dyke cuts through sandstone
A whole suite of geolgical dykes of Permian age cross-cut the Old Red Sandstone of Orkney. For its part, the Devonian age sandstone shows superb desiccation polygons - the Orcadian depositional basin was an intramontane one, rather than marine, so dried out from time to time.