Definition of red rock in English:

red rock

noun

  • 1Any of various kinds of reddish sedimentary rock; a layer or formation consisting of such rock; specifically = "red beds".

  • 2Geology (now rare) a bright reddish granophyre typically associated with formations of gabbro.

Origin

Early 18th century; earliest use found in Richard Bradley (?1688–1732), botanist and writer.