8oo INDEX TO VOLUME XXIII 



PAGE 



Soper, E. K. The Buried Rock Surface and Pre-Glacial River Valleys 



of Minneapolis and Vicinity 444 



Steidtmann, Edward. Summaries of Pre-Cambrian Literature of North 



America for 1909, 1910, 1911, and Part of 1912 . . 81, 183, 261, 461, 575 



Strength of the Earth's Crust, The. VII. Variations of Strength with 

 Depth as Shown by the Nature of Departures from Isostasy (Sec- 

 tion B) . By Joseph Barrell 27 



Strength of the Earth's Crust, The. VIII. Physical Conditions Con- 

 trolling the Nature of Lithosphere and Asthenosphere. By Joseph 

 Barrell 425,499 



Siissmilch, C. A. An Introduction to the Geology of New South Wales. 



Review by R. T. C 379 



Titanium and Apatite Deposits of Virginia, Geology of the. By 



Thomas Leonard Watson and Stephen Taber. Review by T. T. Q. 191 



Topographic and Geologic Survey Commission of Pennsylvania, Report 



of the. By Richard R. Hise. Review by T. T. Q. . . . 286 



Trimerorhachis, a Permian Temnospondyl Amphibian. By S. W. 



Williston 246 



Two Glacial Stages in Alaska. By Stephen R. Capps .... 748 



Umpleby, J. B. Ore Deposits in the Sawtooth Quadrangle, Blaine and 



Custer Counties, Idaho. Review by A. D. B 288 



Unaweep Copper District, Colorado, Notes on the. By B. S. Butler. 



Review by A. D. B 384 



Useful Minerals of the United States. By Samuel Sanford and Ralph 



W. Stone. Review by A. D. B 287 



Upham, Warren. Revision of the Map of Lake Agassiz . . . 780 



Variations of Glaciers. XIX. By Harry Fielding Reid ... 548 

 Volcanic Dust in Oklahoma. Bulletin 13, Oklahoma Geological Sur- 

 vey. By Frank Buttram. Review by R. D. S 380 



Water Reptiles of the Past and Present. By S. W. Williston. Review 



by M. G. Mehl 94 



Watson, Thomas Leonard, and Stephen Taber. Geology of the Tita- 

 nium and Apatite Deposits of Virginia. Review by T. T. Q. . 191 



Waverly Formations of Central and Southern Ohio, Stratigraphy of 



the. By Jesse E. Hyde 655, 757 



Weaver, Charles E. Geology and Ore Deposits of the Covada Mining 



District. Review by T. T. Q. 285 



West Virginia Geological Survey. Marion, Monongalia and Taylor 

 Counties. By Ray V. Hennen. Cabell, Wayne and Lincoln 

 Counties. By C. E. Krebs. Review by T. T. Q 92 



Whitbeck, Ray Hughes. The Geography and Industries of Wisconsin. 



Review by T. T. Q 287 



Williston, S. W. A New Genus and Species of American Theromorpha. 



Mycterosaurus longiceps 554 



. Trimerorhachis, a Permian Temnospondyl Amphibian . 246 



. Water Reptiles of the Past and Present. Review by M. G. 



Mehl 94 



