Viii BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 



Some cavern deposits in the Permian in west Texas; by J. A. 

 Udden 153 



Paleozoic-Mesozoic contact throughout Wyoming [abstract] ; 

 by S. H. Knight 155 



Stratigraphy of the Lower' Oreodon beds of the South Dakota 

 Big Badlands [abstract and discussion] ; by William J. 

 Sinclair 1 1J 5 



Discussion of the Pleistocene and its vertebrate faunas [ab- 

 stract and discussion] ; by Oliver P. Hay 156 



Licks and caves of the Lower Ohio Valley as repositories of 

 mammalian remains, including those of man ; by Arthur 

 M. Miller 156 



Correlation of the Jurassic formations of western Cuba [ab- 

 stract and discussion] ; by Barnum Brown and Marjorie 



O'CONNELL 159 



Register of the Amherst meeting, 1921 . 160 



Constitution and By-Laws 162 



Officers, Correspondents, and Fellows of the Geological Survey of 



America 173 



Proceedings of the Twentieth Annual Meeting of the Cordilleran Section 

 of the Geological Society of America, held at Berkeley, California, March 



26, li)21 : Austin F. Rogers, Secretary 1ST 



Session of March 26 188 



Election of officers for 1921 188 



Program of papers 188 



Correlation and paleogeography of the marine Tertiary of 



California [title] ; by Bruce L. Clark. 188 



Probable occurrence of massive troilite in serpentine [title] ; 



by A. S. Eakle 188 



Jurupaite, a new mineral from Crestmore, California [title] ; 



by A. S. Eakle 1S8 



Late Tertiary mammalian remains from near Alturas, north- 

 eastern California [title] ; by Chester Stock 188 



Marsupial from the John Day Oligocene of Logan Butte. Ore- 

 gon [title] ; by Chester Stock and E. L. Furlong 189 



Mechanics of the San Andreas fault [title] ; by Bailey Willis 189 

 Certain marked differential movements in the San Francisco 



Bay region [title] ; by G. D. Louderback 189 



Jasperoid of the Joplin District, Missouri, Kansas, and Okla- 

 homa [title] ; by W. S. Tangier Smith 189 



Collophane, a much-neglected mineral [title] ; by Austin F. 



Rogers ig9 



Discussion of the age of Briones formation of middle Cali- 

 fornia [title] ; by P. D. Trask 189 



Montezuma Hills [title] ; by G. A. Wilcox 189 



Some new aspects of the geology at Cobalt [title] ; by A. R. 



Whiteman 189 



Business session of the Section . . 190 



