VI BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 



New evidence on the Taconic question [abstract] ; by Arthlr Keith. . 720 



Some features in the Grand Canyon of Colorado River [abstract] ; by 

 N. H. Darton 721 



Pre-Cambrian formations in South-central British Columbia [abstract] ; 

 by Reginald A. Daly 721 



Covey Hill revisited [discussion] ; by J. W. Spencer 721 



Geology of Steep Rock Lake [abstract] ; by Andrew C. Lawson 722 



Fossils of lower limestone of Steep Rock series [abstract and discus- 

 sion] ; by Charles D. Walcott 723 



Origin of the sediments and coloring matter of the eastera Oklahoma 

 red beds [abstract and discussion] ; by J. W. Beede 723 



JVIesozoic stratigraphy of Alaska [abstract] ; by G. C. Martin 724 



Dark scale of hardness [abstract] ; by Alfred C. Lane 725 



Demonstration of relative refraction [abstract] ; by Alfred C. Lane. . 725 



Stratigraphic study of the Appalachian and C-entral States with refer- 

 ence to the occurrence of oil and gas [abstract] ; by George H, Ashley 725 



Granularity limits in petrographic-microscopic work [abstract] ; by 

 Fred E. Wright 726 



Arkansas diamond-bearing peridotite area [abstract and discussion] ; 

 by L. C. Glenn 726 



Variation of the optic angle of gj^psum with temperature [abstract] ; 

 by Edwaed H. Kraus 726 



Paragenesis of the zeolites [abstract and discussion] ; by J. Volney 

 Lewis 727 



Occurrence of petroleum associated with faults and dikes [abstract] ; 

 by Frederick G. Clapp 728 



Color scheme for crystal models [abstract] ; b.^ George Halcott Chad- 

 wick 728 



New minerals from the favas of Brazil [abstract] ; by Oliver Cum- 

 MiNGs Farrington 728 



Resins in Paleozoic coals [abstract] ; by David White. .' 728 



Onyx deposits in east Tennessee [abstract] ; by C. H. Gordon 729 



Suggestion for mineral nomenclature [abstract] ; by Henry S. Wash- 

 ington 729 



Glacial deposits of the continental type in Alaska [abstract and discus- 

 sion] ; by R. S. Tarr and Lawrence Mahtin 729 



Pre-Wisconsin Glacial drift in the region of Glacier Park. Montana 

 [discussion] ; by William C. Alden 730 



Some Glacial deposits east of Cody, Wyoming, and their relation to 

 the Pleistocene erosional history of the Rocky Mountain region [ab- 

 stract and discussion] ; by William J. Sinclair 731 



Evidence of three distinct Glacial epochs in the San Juan Mountains 

 of Colorado [abstract] ; by Wallace W. Atwood and Kirtley F. 

 Mather 730 



Glacial investigations in Minnesota in 1911 [abstract and discussion] ; 

 by Frank Leverett 732 



Grooved and striated contact i)lane between the Nebraskan and Kan- 

 san drifts [abstrnct] ; by J. Ernest Carman 735 



Nebraskan drift of the Little Sioux Valley in northwest Iowa [ab- 

 stract and discussion] ; by J. Ernest Carman 735 



