398 PROCEEDINGS OF THE CALIFORNIA MEETING 



PROBLEM OF THE TEXAS TERTIARY SANDS 

 BY E. T. DUMBLE 



(Abstract) 



Five separate sandy formations occur in a comparatively narrow belt in 

 the Texas coastal Tertiaries. Of these, only one is certainly represented on 

 the Sabine, while two of entirely different age are present on the Rio Grande. 

 In the area between these rivers two additional sandstone belts are found, 

 but so far as known there is no one section in which all five of the sands can 

 be found. Because of the lithologic resemblance, scarcity of fossils, and lack 

 of detailed stratigraphic work, much confusion has arisen regarding these beds 

 and erroneous correlations of them have been made. 



The results of recent investigations between the Sabine and Brazos rivers 

 appear to clear away some of the misunderstandings which have arisen con- 

 cerning the identity and age of these several beds as they occur in this region, 

 and to open the road for the final solution of the problem in the areas between 

 the Brazos and the Rio Grande. 



Read in full from manuscript. Remarks were made by Doctors Alex- 

 ander Deussen and W. D. Matthew. 

 Published in full in this volume. 



PISOLITES AT SAN ANTONIO, TEXAS 

 BY ALEXANDER DEUSSEN ' 



(Abstract) 



A description of pisolitic pebbles in stream terraces of San Antonio River 

 was given, with a discussion as to the possible origin of the pebbles. A map 

 showing the location and photographs illustrating sections of the pisolites 

 were exhibited. 



Presented in full extemporaneously. Remarks were made by Dr. W. D. 

 Matthew and Messrs. Bruce L. Clark and H. W. Turner, 



GEOLOGIC AGE OP THE COAL CREEK BATHOLITH AND ITS BEARING ON SOME 

 OTHER FEATURES OF THE GEOLOGY OF THE COLORADO FRONT RANGE 



BY HYRUM SCHNEIDER' 



(Abstract) 



The name Coal Creek batholith is here given to a mass of granite exposed 

 in parts of Gilpin, Jefferson, and Boulder counties, Colorado. This granite 

 has heretofore been considered as pre-Cambrian and probably Archean. 



In mapping the Coal Creek quartzite, what appears to be good field evidence 



« Introduced by J. A. Taff. 

 "> Introduced by H. B. Patton. 



