Volume XVII : Number 5 
THE 
Journal of Geology 
é 
A Semi-Quarterly Magazine of Geology and 
Related Sciences 
FULV-AUGUST, 1009 
EDITORS 
T. C. CHAMBERLIN, zz General Charge 
R. D. SALISBURY R. A. F. PENROSE 
. Geographic Geology Economic Geology 
J. P. IDDINGS Cc. R. VAN HISE 
Petrology Structural Geology 
STUART WELLER W. H. HOLMES 
Paleontologic Geology .- Anthropic Geology 
S. W. WILLISTON, Vertebrate ee og 
ASSOCIATE EDITORS 
SIR ARCHIBALD. GEIKIE neck QO. A. DERBY 
Great Britain : Braztl 
H. ROSENBUSCH G. K. GILBERT. 
i Germany Washington, D. C. 
CHARLES BARROIS H. S. WILLIAMS 
France Cornell University 
‘ ALBRECHT PENCK C. D. WALCOTT | 
F Germany _ Smithsonian Institution 
- HANS: REUSCH J. C. BRANNER 
3 Norway : - Stanford University 
GERARD DE GEER W. B. CLARK 
Sweden - Johns Hopkins University 
ae Ww. Ee DAVID: 7 > WILLIAM H. HOBBS 
A ee : University of Michigan 
~—~Ehe Anibversity of Chicago Press 
CHICAGO AND NEW YORK 
WItitiam WEsLEY & Son, Lonpon 
: 
é. 
