Silurian RocksA name given by Sir R. Murchison to what miners call gray-wacke, and Werner termed transition rocks. Sir Roderick called them Silurian because it was in the region of the ancient Silures that he investigated them. Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 More on Silurian Rocks from Fact Monster:
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