Geology and Mineralogy. 239 



Professor Fairbanks, one with a throw of 2000 feet, yet no fault 

 lines are shown on the map, because " not clearly defined in the 

 field.'' They are shown, however, in the structure sections and 

 it would be of advantage to students if a less conservative 

 attitude had been adopted in constructing the areal map. 



No. 107. — Newcastle Folio, Wyoming-South Dakota; by N. 

 H. Daetox. 



No. 108. — Edgement Folio, South Dakota-Nebraska; by N. H. 

 Daetox and W. S. Tangier Smith. 



The three folios (Nos. 85, 107, 109) which describe the geology 

 of the edge of the Black Hills uplift are interesting, because 

 of their local features, and because they furnish such excellent 

 illustrations of simple monoclines, erosion forms and stream sys- 

 tems. They are destined to be much used in teaching. 



No. 109. — Cottonwood Falls Folio, Kansas; by C. S. Peossee 

 and J. W. Beede. This quadrangle is part of the Great Plains 

 province and is underlaid entirely by Carboniferous rock, mostly 

 limestone. The topographic features are due to erosion of nearly 

 horizontal strata. 



2. Geological Survey of Canada. Summary Report for 1903. 

 212 pp.', 7 maps. — For the year 1903 the staff of the Canadian 

 Survey numbered 57, and Dr. Bell had at his disposal an appro- 

 priation of $133,000. Economic work has received chief atten- 

 tion, and parties have been at work investigating mineral 

 resources in Yukon Territory, British Columbia, Ontario, Quebec, 

 New Brunswick and Nova Scotia. Mr. R. W. Brock describes 

 the Physiography of the Lardeau District, one of the most 

 rugged and picturesque portions of the Selkirks. Dr. R. A. 

 Daly continued his work along the international boundary. He 

 found the conditions exceptionally favorable for structural 

 studies. Three master thrust faults occur. One of them lies in 

 the plane of bedding and the blocks have been rotated and over- 

 turned. Additional evidence is found in support of the hypoth- 

 esis of "overhead stoping" as a mode of igneous intrusion. 

 The work of the survey is retarded by the lack of adequate 

 topographic maps. 



3. Examination of the Coral-Hock Cores from the Borings 

 at Funafuti. — The general report upon the borings made in the 

 coral rock of the atoll of Funafuti has already been noticed in a 

 recent number (vol. xvii, p. 478, June, 1904); some of the results, 

 however, which have been reached by Prof. J. W. Judd and 

 Dr. C. Gilbeet Cullis, in the minute chemical and microscopical 

 examination of the cores of coral rock obtained deserve more 

 detailed presentation. It will be remembered that the main bor- 

 ing was carried to a depth of 1114^ feet, while two other minor 

 borings were also made at an earlier date. Samples from the 

 former boring yielded J 33 analyses, and those from the latter 72 

 analyses. 



The chief result of this careful chemical work is to show that 

 in the first 50 feet of descent there is a gradual rise in the per- 



