Old Red Sandstone

noun

Definition of Old Red Sandstone

: a thick series of fragmental chiefly sandstone rocks of nonmarine origin, predominantly red in color, and representing the Devonian system in some parts of Great Britain and elsewhere in northwestern Europe

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Cite this Entry

“Old Red Sandstone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Old%20Red%20Sandstone. Accessed 25 Jan. 2021.

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