Geology. 681 



II. Geology. 



1. Geology of the North American Cordillera at the Forty- 

 ninth Parallel ; by Reginald Aldavoeth Daly. Memoir No. 

 38, Geological Survey of Canada. Ottawa, 1912. In three parts, 

 pp. 857, pis. 73, tigs. 42, tables 55. — This report, a most impor- 

 tant contribution to the geology of western Canada, was originally 

 issued as Appendix 6, Report of the Chief Astronomer and Com- 

 missioner for Canada, International Boundary Surveys. In that 

 form it was not accessible to many libraries and individual geol- 

 ogists. The Geological Survey has accordingly done an impor- 

 tant service to geology in republishing it as one of their memoirs. 

 As stated by Director Brock in the introductory note, — It must 

 be referred to constantly in future work dealing with the geolog} 7 

 of British Columbia, and were it not available in the publications 

 of the Survey great loss and inconvenience would result. 



The area survej^ed consists of a belt 400 miles long, varying in 

 width from 5 to 10 miles. The field work was carried on by 

 Professor Daly from 1901 to 1906, over rugged or heavily wooded 

 mountains. An additional difficulty lay in that for several 

 seasons the geologist was in advance of the topographic mapping. 

 Daly states that the quality of the work is between that of a 

 detailed and a reconnaissance survey. It is sufficiently detailed, 

 however, to show the character of the general geology. The 

 geologic maps and sections in the atlas which constitutes Part 

 III bring this out, but perhaps the most impressive feature of 

 the report consists in the number of novel points of view and the- 

 oretical problems which the author has developed from the field 

 studies. These have been in considerable part published by him 

 elsewhere, but are here given in the field setting where they were 

 developed. They w r ill supply material for research along these 

 lines for many years. The test of the value of these ideas con- 

 sists in part in the degree to which they will ultimately become 

 verified, or the basis at least of modifications of older views, but 

 the value consists most largely in the degree to which they will 

 stimulate further investigation. The report is far more valuable 

 than if it had been restricted to mere descriptions of rocks and 

 structure, and, as long as such memoirs as this of Professor 

 Daly's are published, geologic science is in no danger of stagna- 

 tion, j. b. 



2. Florida State Geological Survey: E. H. Sellards, Ph.D., 

 State Geologist, Sixth Annual Report, 1914. Pp. 451, figs. 90, 

 and a Key Map to Mineral Resources of Florida. — The annual 

 report for the year 1913 includes the following papers : Mineral 

 industries and resources of Florida by E. H. Sellards (pp. 21- 

 114); Some Florida lakes and lake basins by E. II. Sellards (pp. 

 115-160); The relation between the Dunnellon Formation and 

 the Alachua Clays of Florida by E. H. Sellards (pp. J 61-162); 

 and the geography and vegetation of Northern Florida by R. M. 



