Proper noun
New Red Sandstone
(geology) Beds of red sandstone and associated rocks laid down throughout the Permian to the end of the Triassic, underlying the Jurassic-Triassic age Penarth Group.
The remnants of the Variscan uplands in France to the south were eroded down, resulting in layers of the New Red Sandstone being deposited across central England. Source: Internet