Your search for "siluria" found:

Murchison, R.I. (1859). Siluria. The History of the Oldest Fossiliferous Rocks and their Foundations; with a brief sketch of the Distribution of Gold over the Earth. John Murray.

Murchison, Roderick I. 1854. Siluria. A History of the Oldest Known Rocks Containing Organic Remains. London: John Murray, 1st edition. John Murray.