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Old Red Sandstone, abbreviated ORS, is an assemblage of rocks in the North Atlantic region largely of Devonian age. It extends in the east across Great Britain, Ireland and Norway, and in the west along the eastern seaboard of North America .
Old Red Sandstone [ edit ] Along the southeastern border of the national park, southeast of the Highland Boundary Fault is a broad outcrop of Devonian age rocks, familiarly referred to as the Old Red Sandstone , part of a much wider outcrop which extends from the Firth of Clyde to the North Sea coast.
Most of the Old Red Sandstone of Orkney is Middle Devonian. [2] The lower part of the sequence, mostly Eifelian in age, is dominated by lacustrine beds of the lower and upper Stromness Flagstones that were deposited in Lake Orcadie .
Devonian age rocks are broadly synonymous with the Old Red Sandstone (commonly referred to as ‘the ORS’) though the lowermost ORS is late Silurian in age. The Anglo-Welsh Basin which stretches from the border with England westwards through the Brecon Beacons National Park into Pembrokeshire includes the larger part of this sequence.
Red beds (or redbeds) are sedimentary rocks, typically consisting of sandstone, siltstone, and shale, that are predominantly red in color due to the presence of ferric oxides. Frequently, these red-colored sedimentary strata locally contain thin beds of conglomerate , marl , limestone , or some combination of these sedimentary rocks.
3.1 Old Red Sandstone. 3.2 Igneous rocks. 3.3 Metamorphic rock. 4 Carboniferous. ... Devonian age volcanic rocks and a granite pluton form the Cheviot massif.
The old red sandstone; or, New walks in an old field. To which is appended a series of geological papers, read before the Royal Physical Society of Edinburgh (1858) Sketch-book of popular geology being a series of lectures delivered before the Philosophical Institution of Edinburgh (1859)
An outlier of the Lower Old Red Sandstone occurs around the Tomintoul area. Principally Devonian age sandstones, they contain siltstones too and a basal conglomerate. These strata are collected together as the Tomintoul Group and consist of a lower Delnabo Conglomerate Formation, an overlying Raebeg Sandstone Formation and an upper Conglass ...