Siluʹrian Rocks
. A 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 Silurēs that he investigated them.
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.