790 PROCEEDINGS OF THE CORDIL,LERAN SECTION 



University of California, Berkeley, at 10.30 a. m., March 25, 1910, by 

 the chairman of the section^ Prof. A. C. Lawson. 



The minutes of the previous annual meeting were read and approved, 

 except that "ninth'^ annual was ordered changed to "tenth" annual, the 

 ninth annual meetiag having been held at Albuquerque, New Mexico, in 

 conjunction with the general Society. 



ELECTION OF OFFICERS 



The officers of the section were reelected for the ensuing year: A. C. 

 Lawson, Chairman; G. D. Louderback, Secretary; G. K. Gilbert, Coun- 

 cilor. 



The section then passed to the reading of scientific papers, and the 

 following were presented in the order given : 



LIMESTONE PLAINS OF THE INTERIOR OF BAHIA 

 BY J. C. BRANNER 



(Abstract) 



Limestones, probably of Jurassic age, cover many thousands of square miles 

 in the interior of Brazil, especially in the states of Bahia and Minas Geraes. 

 In many parts of the same region valley floors are covered by recent limestone 

 deposits spread out in horizontal sheets. These later limestones appear to be 

 derived from the older ones by processes now in operation in the same region 

 in modified form. 



The paper was discussed by A. C. Lawson, who compared the phe- 

 nomena described with some in Mexico ; by E. W. Hilgard, with reference 

 to the Santa Cruz Mountains and Susan Eiver Valley, and by E. Kelsey. 



GEOLOGIC WORK OF ANTS IN TROPICAL COUNTRIES 

 BY J. C. BRANNER 



Published as pages 449 to 496 of this volume. 



The paper was discussed by E. W. Hilgard, with special reference to 

 the "hog wallows" of Louisiana, which he considers may possibly have 

 been caused by the action of ants, although believing that "hog wallows'' 

 in general — and especially in the west — are the products of wind action, 

 erosion, etcetera. E. Kelsey also remarked that similar phenomena could 

 be caused by the blowing down and uprooting of trees. 



TABLES FOR THE DETERMINATION OF CRYSTAL CLASSES^ 

 BY W. S. TANGIER SMITH 



Published as pages 731-736 of this volume. 



1 This paper, in the absence of the author, was read and discussed by A. S. Eakle. 



