Sf 



5^0.b 13 



/ 



THE 



N H 



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 



SIR ARCHIBALD GEIKIE 



Great Britain 

 H. ROSENBUSCH 



Germany 



CHARLES BARROIS 



France 



ALBRECHT penck 



Austria 

 HANS REUSCH 



Norway 

 GERARD DE GEER 



Sweden 

 GEORGE M. DAWSON 



Canada 

 WILLIAM B. CLARK, 



0. A. DERBY 



Brazil 

 G. K. GILBERT 



Washington, D. C. 



H. S. WILLIAMS 



Yale University 

 JOSEPH LE CONTE 



University of California 

 C. D. WALCOTT 



U. S. Geological Survey 

 J. C. BRANNER 



Stanford University 



1. C. RUSSELL 



University of Michigan 

 Johns Hopkins University 



VOLUME VII 



CHICAGO 



&$t SJntbersttg of <£i)tcago ^ress 



1899 



