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Geology of Orkney : ウィキペディア英語版 | Geology of Orkney
The geology of the Orkney islands in northern Scotland is dominated by the Devonian age Old Red Sandstone (ORS). In the southwestern part of Mainland, this sequence can be seen to rest unconformably on a Moinian type metamorphic basement. ==Metamorphic basement== Metamorphic rocks are exposed near Stromness and Yesnaby on Mainland and on Graemsay.〔(Basement geology of Orkney, Hall, Adrian and Brown, John, "Orkney Landscapes" (online) (Edinburgh, Scotland) September 2005, Last update 10-Nov-2008 )〕 Most of the basement consists of granitic gneisses and later minor intrusions. These rocks are similar to those seen in northern Caithness and have been correlated with the Loch Eil Group of the late Proterozoic Moine sequence. The unconformity at the base of the overlying Devonian rocks is highly irregular, with the exposed basement forming hills in this buried land surface.
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