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new red sandstone
The New Red Sandstone is a chiefly British geological term for the beds of red sandstone and associated rocks laid down throughout the Permian (280 million years ago) to the end of the Triassic (about 200 million years ago) that underlie the Jurassic Lias; the term distinguishes it from the Old Red Sandstone which is largely Devonian in age.
Its upper layers consist of mudstones, but most of the formation consists of reddish sandstones, interbedded with rare evaporite minerals such as halite and gypsum; these indicate deposition within a hot and arid palaeo-environment e.g. a desert or sabkha.
== Central UK locations ==
The New Red Sandstone covers much of central England, where it generally forms a low-lying plain except for the Mid Severn Sandstone Plateau. Thick layers (up to 1100 m thick) are present in the faulted Cheshire Basin which also extends beneath north Shropshire. There are numerous escarpments forming small prominent hills within this area. The sandstone also underlies parts of Lancashire and Cumbria, and east of the Pennines it extends through Nottinghamshire and central Yorkshire. Smaller outcrops occur in other parts of Britain such as the Red Cliffs of Dawlish and East Devon.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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