Reviews — Geology and Palceoniology of West Indies. 333 



mainly of limestones and schists, invaded at various horizons by 

 narrow dykes of gneissic granite. The Slocan series is formed of 

 limestones and argillites. The next deposits are Quaternary. 



The mineralization was induced by the great Nelson (West 

 Kootenay) granite batholith — a quartz - monzonite of Jurassic 

 age, associated with it being camptonite dykes, later than the con- 

 solidation of the granite, but previous to the mineral deposition. 

 The important economic deposits are silver-lead ores, which appear 

 as true fissure veins and metasomatic replacements in limestones. 

 The ores consist of argentiferous galena (20 oz. silver to the ton) 

 and zinc-blende in a gangue of calcite, siderite, quartz, and fluorite. 

 The replacements and veins are evidently contemporaneous. 

 Detailed descriptions of the mines are given, the general prospects 

 of the area being good, the value of the production in 1918 being 

 8662,388. 



In an interesting final chapter the author ascribes the Purcell 

 trench, in which Ainsworth is situated, to river- carv'ing in Tertiary 

 and Quaternary times in a peneplain, and not to faulting, as 

 suggested bv Daly. 



J. E. A. W. 



Contributions to the Geology and Pal.t.ontology of the 



West Indies : Fossil Echini of the West Indies. By 



Robert Tracy Jackson. Stratigraphic Significance of 



the Species of West Indian Fossil Echini. By Thomas 



Waylaxd Vaughan. iv+122 pp., 18 plates, 6 text-figures. 



Carnegie Institution of Washington. Publication No. 306, 



15th February, 1922. 



f\F the eighty-nine species of fossil Echinoids known from the 



^ West Indies only eight are found in the Cretaceous, and they 



belong to the genera Codiopsis, Salenia, Phi/mosoma, Conulus, 



Lanieria, Discoidea, Cardiaster, and Hemiaster. Examples of 



fifty-seven of the species (of which sixteen are new) have been 



studied by Dr. Jackson, and of these figures and careful descriptions 



are given. In order to give completeness to the work references and 



localities of the species of which specimens were not examined are 



included. 



With regard to the geographical relationship of the Tertiary 

 species Dr. Jackson says that the genera Anomalacanthus, Laganum, 

 Peronella, Brissus, Eupatagas. and Breynia found fossil in the West 

 Indies are at the present day essentially Indo-Pacific types ; and 

 three species of Cidaris find their nearest living allies in .Australian 

 or Japanese seas. Clypeaster oxyhaphon n.sp. is related to an Indo- 

 Pacific form. The species of Echinolat/ivas, of which seven are known 

 from the Eocene and Oligocene, are more like the Recent Indo- 

 Pacific forms than like the living AVe.=it Indian species. 



Dr. Jackson's memoir is followed l)y a paper on the stratigraphical 

 significance of the species by Dr. T. W. Vaughan. 



