660 PROCEEDINGS OF THE CORDILLERAN SECTION 



ORIGIN OF SOUTH AMERICAN BEARS 

 BY JOHN C! MEERIAM 



[Abstract] 



The spectacle bear of South America represents a type known only from the 

 western hemisphere. Its nearest allies are found in genus Arctothcrium, occiw- 

 ring in the Quaternary of North and South America. Two views have been 

 expressed concerning the origin of this type. The most nearly related forms 

 are probably Asiatic. 



The next three pajDers were read b}' title. 



RECONNAISSANCE OF A RECENTLY DISCOVERED QUATERNARY CAVE DEPOSIT 



NEAR AUBURN, CALIFORNIA 



BY E. L.. FURLONG* 



This paper was published in Science, new series, volume xxv, j\Iarch, 

 1907, pages 392-394. 



PHYSIOGRAPHIC CHANGES BEARING ON THE FAUNAE RELATIONSHIPS OF 

 THE RUSSIAN AND SACRAMENTO RIVERS, CALIFORNIA 



BY' EULIFF S. HOLWAY't 



This paper was published in Science, new series, volume xxvi. Septem- 

 ber, 1907, pages 382-383. 



SAN PABLO FORMATION OF MIDDLE CALIFORNIA 

 BY CHAS. E. ^^■EAVEE* 



The last paper of the da}' read and discussed was 



TWO MOZ'NTAIN RANGES OF SOUTHERN CALIFORNIA 

 BY W. C. MENDENHALL 



[Abstract] 



The San Gabriel and the San Bernardino ranges are adjacent mountain 

 masses, separated only by Cajon pass, and holding identical relations to the 

 valley of southern Califoi-nia. and to the Mojave desert, lying to the north and 

 east of it. They also are similarly related to the principal fault lines of this 

 part of California, each of them being bounded along its southern margin by a 

 major fracture, and one of them, the San Gabriel, certainly being limited in a 

 similar way along its northern base, while less definite evidence indicates that 

 the San Bernardino range is related in the same way to the desert lowland. 

 Ijittle is known of the geology of the interior of the two ranges, but that little 

 indicates that in a broad way they contain similar masses of rocks, which 

 probably differ but little in their ability to resi.st the attacks of erosional 

 agents. 



* Introduced by .T. C. Merriam. 



t Introduced by George D. Louderback. 



