I put it all down as devonian, it is almost exactly like Hugh Miller's old red sandstone, as seen in Ross-shire, the matrix of a paler red, but the mass of water-worn pebbles embedded in it is the same.
"The Incomparable 29th and the "River Clyde""
George Davidson
Along our course the bluish devonian shales are capped by yellow boulder-clay.
"The New North"
Agnes Deans Cameron
Marine or devonian Type of Old Red Sandstone.
"The Student's Elements of Geology"
Sir Charles Lyell