V 



ffV, 5" 

 I J H 



THE 



JOURNAL OF GEOLOGY 



A Semi-Quarterly Magazine of Geology and 

 Related Sciences 



Editors 



T. C. CHAMBERLIN, in General Charge 



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



Geographic Geology Economic Geology 



J. P. IDD1NGS C. R. VAN HISE 



Petrology Pre-Cambrian Geology 



STUART WELLER W. H. HOLMES 



Paleontologic Geology Anthropic Geology 



Associate Editors 



CHICAGO 



Ci)c Bnibersitg of <£i)icago ^regg 



1901 



vV 



