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The geology of the Orkney islands in northern Scotland is dominated by the Devonian Old Red Sandstone (ORS). In the southwestern part of Mainland , this sequence can be seen to rest unconformably on a Moinian type metamorphic basement .
(The islands’ history before human occupation is part of the geology of Scotland.) Although some records referring to Orkney survive that were written during the Roman invasions of Scotland, “prehistory” in northern Scotland is defined as lasting until the start of Scotland's Early Historic Period (around AD 600).
The Group comprises the Upper Eday Sandstone Formation, Eday Marl Formation, Middle Eday Sandstone Formation, Eday Flagstone Formation, Lower Eday Sandstone Formation and the Hoy Sandstone Formation laid down in the shallow Orcadian Basin during the Givetian stage of the Devonian period. The sediments vary from fluvial to lacustrine to lagoonal.
In 1564 Lord Robert Stewart, natural son of James V of Scotland, who had visited Kirkwall twenty-four years before, was made sheriff of Orkney and Shetland, and received possession of the estates of the udallers; in 1581 he was created earl of Orkney by James VI, the charter being ratified ten years later to his son Patrick, but after Patrick's ...
The Stone of Setter is an extremely tall sandstone monolith of irregular shape. It dates to the Late Neolithic or Early Bronze Age, probably around 2nd millennium BC. [ 3 ] It measures approximately 4.5 m (15 ft) in height, 2.1 m (6 ft 11 in) in width, and the stone varies in thickness from 0.9 m (2 ft 11 in) at the base to 0.35 m (1 ft 2 in ...
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.
The Old Man of Hoy is a red sandstone stack, perched on a plinth of basalt rock, and one of the tallest sea stacks in the UK. [4] [5] It is separated from the mainland by a 60-metre (200 ft) chasm strewn with debris, and has nearly vertical sides with a top just a few metres wide. [3]
Graemsay lies between Hoy and Stromness on Mainland Orkney, separated from the Mainland by Clestrain Sound. The island is 409 ha (1.58 sq mi) in area and is mainly crofted. The island's geology is Old Red Sandstone of the Devonian period, with two volcanic faults. On the north coast there is granite-schist, a great rarity in Orkney.