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Volume XVII | Number 2 
THE 
Journal of Geology 
A Semi=Quarterly Magazine of Geology and 
Related Sciences 
BEBO WRIA PCH. 1000 
EDITORS 
T. C. CHAMBERLIN, zz General Charge 
_R. D. SALISBURY RevAs hoy PENROSE 
Geographic Geology Economic Geology 
ol P. Nes ; c: R. VAN HISE 
‘ Petrology Structural Geology 
en “STUART WELLER W. H. HOLMES 
‘ Paleontologic Geology Anthropic Geology 
: S. W. WILLISTON, Vertebrate Paleontology 
ASSOCIATE EDITORS 
SIR ARCHIBALD GEIKIE G. K. GILBERT 
Great Britain : Washington, D. C. 
AH. eet H. S. WILLIAMS 
Germany Cornell University 
- CHARLES BARROIS | C.D, WALCOTT 
France Smithsonian asian 
ALBRECHT PENCK \ J. C. BRANNER 
Germany Stanfora University 
-HANS REUSCH W. B. CLARK 
a Norway Johns Hopkins University 
GERARD DE GEER - O. A. DERBY 
. Sweden Brazil 
aT W. E. DAVID WILLIAM H. HOBBS 
Australia University of Michigan 
Che Anibersity of Chicago Press 
CHICAGO AND NEW YORE : 
* WittiaM WESLEY & Son, Lonpon 
