REVIEWS 677 



theory reached by the authors is that of simultaneous solfatarism and 

 oxidation. It is supposed that the ascending waters carried, besides the 

 heavy metals, hydrogen sulphide, carbon dioxide, and alkalies. The 

 hydrogen sulphide was oxidized near the surface to sulphuric acid, which, 

 descending, met more of the uprising currents and caused the deposition 

 of the ores. 



The age of the ore deposits is placed in the late Pliocene, and it is 

 thought that they were formed at a depth of not more than 1,000 feet. 



E. R. L. 



The Vertebrata of the Oligocene of the Cypress Hills, Saskatchewan. 

 By Lawrence M. Lambe. Contributions to Canadian Paleon- 

 tology, Vol. Ill, Part IV. Canada Department of Mines, Geologi- 

 cal Survey Branch. 64 pages of text and 7 plates. 

 The Oligocene of the district, composed chiefly of conglomerate, forms 

 the capping of an extensive area of uplands, and lies unconformably on 

 the Laramie. The vertebrate fauna, which has been known frorn these 

 beds since 1883, has been correlated with the Titanotherium beds at 

 Pipestone Springs, Montana. The publication of the present paper 

 raises the number of species known from these deposits from 25 to over 50. 

 Of these, seven species are of fishes, seven of reptiles, and the remainder of 

 mammals; of the mammals two-thirds of the species belong to the Ungulata. 



E. R. L. 



Report on Tertiary Plants of British Columbia Collected by Lawrence 

 G. Lambe in igo6, together with a Discussion of Previously 

 Recorded Tertiary Floras. By D. P. Penhallow, Canada 

 Department of Mines, Geological Survey Branch. 

 The report presents a very full account of the distribution and strati- 

 graphic significance of the Tertiary floras of British Columbia. The locali- 

 ties are described at which Tertiary plants have been found, with lists 

 of fossils from each locality; then the individual species are discussed 

 briefly, with mention of the localities in which they are found; and follow- 

 ing this is a discussion of the evidence of the floras of the several localities 

 with regard to the age of the deposits and their relationship to similar 

 deposits in other regions. The entire Tertiary flora faUs into two groups 

 belonging to the Eocene and the Oligocene periods. The report is rather 



poorly illustrated by a few text figures. 



E. R. L. 



