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Old Red Sandstone, abbreviated ORS, is an assemblage of rocks in the North Atlantic region largely of Devonian age. ... Stonehaven, Perth and Tayside.
Occasionally pebbly, this red-brown and yellow sandstone dominated unit also contains siltstones and mudstones. It is encountered in Arran in the west and across the Midland Valley to the northeastern parts of Fife in the east. The name is derived from Stratheden in Fife. The rocks of the Stratheden Group have also previously been referred to ...
It is also close to Perth bus station. The hotel was formerly owned and managed by the Highland, North British and Caledonian Railway companies. [4] The building, made of cream and red sandstone, was designed by Perth's city architect Andrew Heiton, who assumed his role some thirty years earlier. [1]
A significant exception to the above are the fossil-bearing beds of the Old Red Sandstone found principally along the Moray Firth coast and in the Orkney islands. These rocks are around 400 million years old, and were laid down in the Devonian period. [4] The Highlands are generally mountainous and are bisected by the Great Glen Fault.
MacGillycuddy's Reeks are composed of sandstone particles of various sizes, which are collectively known as the Old Red Sandstone.The rocks date from the Upper Devonian period (310–450 million years ago) when Ireland was in a hot equatorial setting. [2]
The stone, carved from Old Red Sandstone, stands 2.3 metres (7.5 ft) tall, 1.3 metres (4.3 ft) wide at the base, tapering to 0.9 metres (3.0 ft) wide at the top, and is 0.2 metres (7.9 in) thick. [7] The west face is inscribed with a quadrilobate Celtic Cross. The cross bears several styles of Celtic pattern designs.
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.
The British geologists Adam Sedgwick and Roderick Murchison did fundamentally important work in South Wales on Old Red Sandstone and the underlying rocks. The first volume of memoirs (1846) published by the Geological Survey contained a conspectus of the geology of South Wales that set a template for all future work.