68 EDITORIAL 



The second annual meeting of the Cordilleran section of the 

 Geological Society of America was held on December 28 and 

 29. The morning session on the 28th took place in the council 

 room of the California Academy of Sciences, in San Francisco. 

 For the succeeding three sessions the members gathered in the 

 rooms of the Geological Department of the University of Cali- 

 fornia. 



The following persons were present at the meeting of the 

 section : 



W. P. Blake, E. W. Claypole, A. S. Eakle, H. W. Fairbanks, E. W. 

 Hilgard, W. C. Knight, A. C. Lawson, H. W. Turner, F. M. Anderson, 

 W. C. Blasdale, F. C. Calkins, H. W. Furlong, O. H. Hershey, G. D. 

 Louderback, C. F. Newcombe, W. J. Sinclair, J. C. Merriam. 



At the first session Professor Wilbur C. Knight was elected 

 chairman, Professor Andrew C. Lawson, secretary, and Dr. A. S. 

 Eakle, councilor for the ensuing year. 



In the course of the four sessions the following papers were 

 read and discussed : 



The Evide?ices of Shallow Seas in Paleozoic Tbne in Southern Ari- 

 zona. By W. P. Blake, Tucson, Ariz. 



In the mountain ranges of southern Arizona there is abundant evi- 

 dence of shallow seas and shore lines in Paleozoic time. These 

 shores were not, perhaps, a continental margin, but rather the borders 

 of islands, crests of submerged mountain ranges rising at intervals 

 above the Paleozoic ocean and with a trend or direction corresponding 

 eventually to the direction of the mountain ranges of the region. 



A cross-section of the territory northeasterly from the Gulf of Cali- 

 fornia shows a succession of mountain ranges, some fifteen in number, 

 in most of which ancient sandstones and conglomerates of Paleozoic 

 age have been identified. Many of the exposures of quartzite are very 

 thick, and these quartzites generally rest upon a coarse-grained por- 

 phyritic granite. Deep-sea deposits are not wanting. Thick beds 

 of limestone, especially those of the Carboniferous, give evidence of 

 depressed areas and of oscillations of level. So, also, the existence of 

 thick, uplifted beds of graphitic coal in the Chiricahua Mountains bear 

 testimony to the former existence of land areas, and show a far western 

 extension of the vearetation of the Carboniferous. 



