TWENHOFEL ULRICH 



295 



Page 



TwENHOFEL, W. II., rited on .wiius Virginiaiui 27. '^H 



Gun River formation on Anticosti Island 27, 312 



— , Discussion of Siluric hy 28, 130 



— ; Silver City quartzites : a Kansas metamorpbic area 28, 164, 419 



— and ScHucHERT, Charles ; Ordovicic-Siluric sections of the Mingan 



and Anticosti islands, Gulf of Saint Lawrence. . 21. 7.5, 6T7-71(') : 27. 312 



Twin Mountain House, Dispersion of boulders near 27. 2S2 



TwiTCHELL, M. W., State Geologist of South Carolina 25, 101 



Two Medicine Glacier, Comparison and extension of 24. 542 



— phase convection of igneous ni.-ignias ; V. F. <4rout 29, K'l 



Tyndall, J., cited on cause of glnciation ■ 30, 357 



experimental geology 29, 178 



Types of loess in the Mississippi Valley ; P.. Shimek 27, 82 



North American Paleozoic oolites; F. M. A'an Tuyl and 11. F. Crooks 



29, 102 

 Typical section of the Allegheny formation ; C. K. Swartz and Marvey 



Bassler 30, 153 



Tyrannosaurus, Additional characters of 27, 150 



— , Skull of 21, 75 



Tyrrell, J. B., cited on bea<-hes of Hudson P.ay 29, 227 



Cretaceous strata 25, 3(53 



Hudson P>ay limestones 30, 355 



Ordovician 30, 34:^, 



Paskapoo formation 25, 301 



till overlying Birds Hill esker gravel and sand 21, 414 



• — Wisconsin glaciation 25, 72 



— , Discussion of geological education of engineers 28, 138 



records of T^ake Agassiz and Ontario, Canada, hy 28. 146 



— , Glacial investigations in Minnesota in 1911 discussed hy 23, 46, 733 



u 



Udden, J. A. ; Anticlinal theory as applied to some quicksilver deposits 30, 112 



— cited on dust and sand storms in the west 21, 641 



erosion, transportation, and sedimentation performed liy the at- 

 mosphere 21, 638 



■ — mechanical analyses of sediments 28, 927 



Petrolia oil pool 28, 575 



■ — ; Flattening of limestone gravel boulders by solution 25. ii(i 



— : Mechanical composition of clastic sediments 25. 655 



— , Reference to work on sedimentation by 28, 737 



Uhler, R. R., cited on Sankatay Head sands 30, 608 



Uinta Basin Eocene, Notes and slides of the 23, 88 



— formation, Geology of the 25. 144, 417-420 



— — of Utah 25. 144 



— Tertiary 25, 417 



Ulrich, E. O., California Meeting of the Paleontological Society called 



to order by 26, 410, 



