New Red Sandstone instance of formation
The New Red Sandstone, chiefly in British geology, is composed of beds of red sandstone and associated rocks laid down throughout the Permian (300  million years ago) to the end of the Triassic (about 200 million years ago), that underlie the Jurassic-Triassic age Penarth Group.  The name distinguishes it from the Old Red Sandstone which is largely Devonian in age, and with which it was originally confused due to their similar composition.
Its upper layers consist of mudstones, but most of the formation consists of reddish to yellowish sandstones, interbedded with rare evaporite minerals such as halite and gypsum. These indicate deposition within a hot and arid palaeo-environment, such as a desert or sabkha.Fossil content
The New Red Sandstone has yielded many fossils, including the world-famous Elgin Reptiles. These are late Permian to Late Triassic in age, and include mammal-like reptiles and some of the earliest predecessors of dinosaurs. An earliest Permian (Asselian) fauna is known from the Kenilworth Sandstone Formation of the English Midlands, including primitive synapsids and temnospondyl amphibians.
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