BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 23, pp. 719-747 DECEMBER 17, 1912 



ABSTEx^CTS OF PAPERS PRESENTED AT THE TWENTY- 

 FOURTH ANNUAL MEETING OF THE SOCIETY, BUT 

 NOT PUBLISHED IN FULL IN THE PRECEDING PAGES 

 OF THIS VOLUME, TOGETHER WITH DISCUSSIONS OP 

 PAPERS AS FAR AS PRESERVED. 



E. 0. HovEY^ Secretary 



CONTENTS 



Page 



New evidence on tbe Taconic question [abstractl ; by Arthur 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 722 



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



Fossils of lower limestone of Steep Rock series [abstract and discussion] ; 



by Charles D. Walcott 723 



Origin of the sediments and coloring matter of the eastern Oklahoma red 



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



Mesozoic 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 Central States with reference 



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



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



E. Wright 72G 



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



L. C. Glenn 726 



Variation of the optic angle of gypsum with temperature [abstract] ; by 



Edward H. Kraus 726 



Paragenesis of the zeolites [abstract and discussion] ; by J. Volney I^wis. . 727 

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



Frederick G. Clapp 728 



Color scheme for crystal models [abstract] : by George Halcott Chadwick. 728 

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



Farrington 728 



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



Onyx deposits in east Tennessee [abstract] ; by C. H. Gk)rdon 720 



Suggestion for mineral nomenclature [abstract] ; by Henry S. Washington. 72V) 

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

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



(719) 



