Xll BULLETIN OF THE GEOLOGICAL SOCIETY OV AMERICA 



Page 

 Geology of portions of western Washington [abstract] ; by 



Ch^vrles E. Weaver 397 



Problem of the Texas Tertiary sands [abstract] ; by E. T. 



DUMBLE 393 



Pisolites at San Antonio, Texas [abstract] ; by Alexander 



Delssen 398 



Geologic age of the Coal Creek batholith and its bearing on 

 some other features of the geology of the Colorado front 



range [abstract and discussion] ; by Hyrum Schneider 398 



Occurrence of tiow-breccias in Colorado [abstract and discus- 

 sion] ; by Horace B. Pattox 399 



(xeology of a portion of the Santa Ynez River district, Santa 



Barbara County, California [abstract] ; by W. S. W. Kew. 401 

 Interesting changes in the composition of the Salton Sea [ab- 

 stract] ; by A. E. Vinson 402 



Examples of successive replacement of earlier sulphide min- 

 erals by later sulphides at Butte. Montana [abstract and 



discussion] : by J. C. Ray 402 



Structure of the southern Sierra Nevada [abstract] ; by John 



P. BULWADA 403 



A measure of arid erosion [abstract] ; by Charles Keyes... 404 

 A possible causal mechanism for heave fault-slipping in the 

 California Coast Range region [abstract] ; by Harry O. 



Wood 404 



Structural features of the Tsin Ling Shan [abstract] ; by 



George D. Louderback 405 



Certain structural features in the coal fields of New Mexico 



[abstract] ; by Charles T. Kirk 405 



Deformation of the coast region of British Columbia [ab- 

 stract] ; by Charles H. Clapp 406 



Study of ninety thousand pounds of mammoth tusks from 



Lena River, Siberia ; by George Frederick Kunz 407 



Excursions 4O7 



Register of the California Meeting 408 



Proceedings of the Summer Meeting of the Paleontological Society, held 

 at the University of California and at Stanford University, August 3, 



4, 5, and 6, 1915 ; Chester Stock, Secrctanj pro tern 409 



Session of Tuesday, August 3 410 



Criteria of correlation from the point of view of the inverte- 

 brate paleontologist ; by Edward O. Ulrich 410 



Problem of correlation by use of vertebrates ; by William D. 



Matthew 4II 



Correlation and chronology on the basis of paleography; by 



Charles Schuchert 411 



Discussion of the preceding three papers 411 



Session of Wednesday. August 4 412 



Relations of the invertebrate faunas of the American Triassic 

 to those of Asia and Europe [discussion] ; by James 

 Perrin Smith 412 



