Volume XVI 



Number 8 



THE 



Journal of Geology 



A Semi -Quarterly flagazine of Geology and 

 Related Sciences 



NOVEMBER-DECEMBER, igo8 



EDITORS 



T. C. CHAMBERLIN. in General Charge 



R. D. SALISBURY R. A. F. PENROSE, Jr. 



Geographic Geology Economic Geology 



J. P. IDDINGS C. R. VAN HISE 



Petrology Structural Geology 



STUART WELLER W. H. HOLMES 



Paleontologic Geology Anthropic Geology 



S. W. WILLISTON, Vertebrate Paleontology 



ASSOCIATE EDITORS 



Ef)e ^nibersitg of Chicago ^press 



CHICAGO AND NEW YORK 

 WiLLiAU Wesley & Son London 



COUect/ 



