Old Red Sandstone
noun
: 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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“Old Red Sandstone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Old%20Red%20Sandstone. Accessed 28 Nov. 2024.
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