E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Silu’rian 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 Silurs that he investigated them.
s that he investigated them.
