red beds

British  

plural noun

1. sequences of red sedimentary rocks, usually sandstones or shales, coloured by the oxidization of the iron in them

---

Example Sentences

Two red beds illustrated in her essay, made in New England around 1800, are now for sale through the dealer Austin T. Miller in Columbus, Ohio, and priced between $7,500 and $8,500 each.

From New York Times • Jun. 25, 2015

Only a few months previously he had discovered fossil bones in the red beds of New Mexico, the since famous Permian deposits.

From Dinosaurs With Special Reference to the American Museum Collections by Osborn, Henry Fairfield

Flanking the hills between Ashbourne and Quarndon are red beds of Bunter marl, sandstone and conglomerate; they also appear at Morley, east of the Derwent, and again round the small southern coalfield.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 2 "Demijohn" to "Destructor" by Various

Newton remarks concerning this:4 'A large percentage of peroxide of iron in the red beds, to which they owe their bright red color, bears an interesting relation to the absence of fossils.

From Cave Regions of the Ozarks and Black Hills by Owen, Luella Agnes

Triassic red beds of the Bunter fill the Clwyd valley and appear again on the coal measures S.E. of Chester.

From Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" by Various