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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. IDDINGS

C. R. VAN HISE
Petrology

Pre-Cambrian Geology
STUART WELLER

W. H. HOLMES
Paleontologic Geology

Anthropic Geology
AssociaTE EDITORS
SIR ARCHIBALD GEIKIE

0. A. DERBY
Great Britain

Brazil
H. ROSENBUSCH

G. K. GILBERT
Germany

Washington, D. C.
CHARLES BARROIS

H. S. WILLIAMS
France

Yale University
ALBRECHT PENCK

JOSEPH LE CONTE
Austria

University of California
HANS REUSCH

C. D. WALCOTT
Norway

U. S. Geological Survey
GERARD DE GEER

J. C. BRANNER
Sweden

Stanford University
GEORGE M. DAWSON

I. C. RUSSELL
Canada

University of Michigan
WILLIAM B. CLARK, Johns Hopkins University

VOLUME IX

CHICAGO
The University of Chicago Press

PRINTED BY
Tbe University of Chicago Press

CHICAGO

CONTENTS OF VOLUME IX.

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