256 REVIEWS 



The University Training of Engineers in Economic Geology. By J. C. 

 Branner. (Reprint from Economic Geology, Vol. I, December- 

 January, 1906, pp. 289-94.) 



This paper discusses the training necessary for success in economic 

 geology. The author points out the desirabihty of considerable preliminary 

 study of other subjects, and the necessity of training in pure geology. 



E. W. S. 



Red Beds of Southwestern Colorado and Their Correlation. By Whit- 

 man Cross and Ernest Howe, (Bulletin of the Geological 

 Society of America, Vol. XVI [December, 1905]. Pp. 447-98, 

 Plates 82-85.) 



A marked unconformity occurs in the Red Beds of this area, and several 

 photographs of.it appear in this article. The formation above the break 

 is classified as Triassic on the basis of vertebrate fossils; that below is 

 assigned to the Permian. E. W. S. 



Taconic Physiography. By T. Nelson Dale. (U. S. Geological 

 Survey, Bulletin No. 272, 1905.) Pp. 52, 14 plates, 3 figures. 



There have been three periods of folding in the region — first, at the 

 close of the Lower Cambrian; second, at the close of the Ordovician; and 

 third, in Devonian or Carboniferous time. The topography is the result 

 of the erosion of rocks which vary in composition and structure. The 

 lakes and some other features are due to glaciation. E. W. S. 



Underground Waters of Eastern United States. By Myron L. 

 Fuller. (Water Supply and Irrigation, Paper No. 114, U. S. 

 Geological Survey, 1905.) Pp. 272, 18 plates, 40 figures. 



This report is prepared primarily for drillers and treats of the occur- 

 rence of underground waters. It is a compilation of material from numer- 

 ous local geologists. E. W. S. 



Fire Tests of Some New York Building Stones. By W. E. McCourt. 

 (New York State Museum, Bulletin No. 100.) Albany, 1906. 

 Pp. 38, 26 plates, and index. 



The purpose of testing the building stones was to acquire definite infor- 

 mation regarding their fire-resisting qualities. The rupturing caused by 

 heat, with slow, or with sudden cooling, varies considerably with different 

 rocks. The order of the refractoriness of rocks tested is: (i) sandstone, 

 (2) fine-grained granite, (3) limestone, (4) coarse-grained granite, (5) gneiss, 

 and (6) marble. E. W. S. 



