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New Red Sandstone

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New Red Sandstone, name for the thick red layer of the Triassic formation in Great Britain (see Triassic period Triassic period , first period of the Mesozoic era of geologic time (see Geologic Timescale, table) from 205 to 250 million years ago.

Throughout the Triassic, E North America, as a result of the mountain-building episode that formed the Appalachians in the
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). It is many thousands of feet thick and is composed chiefly of red sandstones, clays, and conglomerate; the red color and the occurrence of workable quantities of salt and gypsum suggest markedly arid conditions at the time of deposition.
New Red Sandstone [′nĂ¼ ′red ′san‚stōn]
(geology)
The red sandstone facies of the Permian and Triassic systems exposed in the British Isles.


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And now one of the richest known accumulations of fossil mammals belongs to the middle of the secondary series; and one true mammal has been discovered in the new red sandstone at nearly the commencement of this great series.
 
 
 
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