At head of title: Geological Survey of Canada. Sir W.E. Logan, F.R.S., director Vols. called Decade I-decade IV Each of the 55 plates accompanied by leaf with descriptive letterpress Decade II has imprint: Montreal : Dawson Brothers ; London, New York, and Paris, Ballière, 1865 Includes bibliographical references Decade 2 includes index decade 1. [Fossils from the base of the Trenton group / by J.W. Salter]. 1859 -- decade 2. Graptolites of the Quebec group / by James Hall. 1865 -- decade 3. [On the Cystideae of the Lower Silurian rocks of Canada / by E. Billings. On the Asteriadae of the Lower Silurian rocks of Canada / by E. Billings. On Cyclocystoides, a new genus of Echinodermata from the Lower and Middle Silurian rocks / by J.W. Salter and E. Billings. On the Palaeozoic bivalve Entomostraca of Canada / by T.R Jones]. 1858 -- decade IV. [On the Crinoideae of the Lower Silurian rocks of Canada / by E. Billings. Memoir on the star-fish of the genus Comatula, demonstrative of the Pentacrinus europaeus / by John V. Thompson]. 1859