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JOURNAL OF GEOLOGY 
A Semi-Quarterly Magazine of Geology and 
Related Sciences 
EDITORS 
T. C. CHAMBERLIN 
R. D. SALISBURY GRE VANSEUIISE 
Geographic Geology Pre-Cambrian Geology 
Jo 25 LDIOIONES W.. H. HOLMES 
Petrology Archeologic Geology 
R. A. F. PENROSE, Jr. 
Economic Geology 
ASSOCIATE EDITORS 
SIR ARCHIBALD GEIKIE JOSE REY VE CON: 
Great Britain University of California 
H. ROSENBUSCH G. K. GILBERT 
Germany Washington 
CHARLES BARROIS H. S. WILLIAMS 
France Vale University 
ALBRECHT PENCK eo G2 BIRANENISR: 
Austria Leland Stanford, Jr. University 
HANS REUSCH Il, Cs IRWSSISILIL 
Norway University of Michigan 
GERARD DE GEER O. A. DERBY 
Sweden Brazil 
GEORGE M. DAWSON 
Canada ZEEE RENN 
f-\\sonian Instit,,..> 
Za wep 
VOLUME Ul 250422 
1895 National Musevs 
CHICAGO 
The University of Chicago Press 
