Volume XIII 



Number 8 



THE 



Journal of Geology 



A Semi=Quarterly flagazine of Geology and 

 Related Sciences 



NOVEMBER-DECEMBER, igo 5 



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 



€f)e Bnibersitg oi Chicago liress 



CHICAGO AND NEW YORK 

 William Wesley & Son, London 



