Hugh Miller (1802-1856) was a self-taught Scottish geologist and writer. Among his geological works are The Old Red Sandstone (1841), Footprints of the Creator (1850), The Testimony of the Rocks (1856), Sketch-book of Popular Geology. Of these books, perhaps The Old Red Sandstone was the best-known. The Old Red Sandstone is still an expression used to describe sedimentary rock deposited after the Caledonian Orogeny in the late Silurian, and before the Carboniferous Period.