STRATIGRAPHY AND STRUCTURE OF MOUNT DIABLO 537 ' 



After the reading of the memorials of the deceased Fellows the regular 

 program of papers was taken up as follows: 



OCCURRENCE OF I'ROVHTITE AND ARCESTITE AT THE CALIFORNIA MINE 

 NEAR AIONTEZUMA, COLORADO 



BY FRANK R. VAN HORN 



This paper has been published as pages 93-98 of this volume. Discus- 

 sion by C. R. Van Hise, George D. Louderback, and H. E. Gregory. 



MINE WATERS AND THEIR FIELD ASSAY 

 BY ALFRED C. LANE 



This paper has been published as pages 501-512 of this volume. 

 The following papers were read by title : 



PHOSPHATE DEPOSITS OF FLORIDA WITH RELATION TO THE UNDERGROUND 



WATER LEVEL 



BY E. H. SELLABDS 



ASBESTOS DEPOSITS OF THE GRAND CANYON, ARIZONA 

 BY JOSEPH HYDE PRATT 



ANCIENT TECTONICS OF THE BASIN RANGES 

 BY CHARLES R. KEYES 



ROCK-FLOOR OF INTERMONT PLAINS OF THE ARID REGION 

 BY CHARLES- R. KEYES 



Published as pages 63-92 of this volume. 

 The next paper read was 



GLACIAL PERIODS AND THEIR BEARING ON GEOLOGICAL THEORIES 



BY A. P. COLEMAN 



This paper has been published as pages 347-366 of this volume. An 

 active discussion was participated in by W. G. Tight, A. C. Lawson, 

 I. C. White, H. M. Ami, G. K. Gilbert, H. E. Gregory, and C. R. Van 

 Hise. 



CHIEF FEATURES OF THE STRATIGRAPHY AND STRUCTURE OF MOUNT 



DIABLO, CALIFORNIA 



BY GEORGE D. LOUDERBACK 



lAistract] 



Mount Diablo is a distinctive feature of the central coast ranges, because it 

 rises from low valleys on practically all sides, and is not merely a more promi- 



