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JOURNAL OF GEOLOGY

THE UNIVERSITY OF CHICAGO PRESS

CHICAGO, ILLINOIS

Agents THE CAMBRIDGE UNIVERSITY PRESS

LONDON AND EDINBURGH

THE MARUZEN-KABUSHIKI-KAISHA

TOKYO, OSAKA, KYOTO

KARL W. HIERSEMANN

LEIPZIG

THE BAKER & TAYLOR COMPANY

NEW YORK

THE

JOURNAL OF GEOLOGY

A Semi-Quarterly Magazine of Geology and

Related Sciences

EDITORS
THOMAS C. CHAMBERLIN, in General Charge; ROLLIN D. SALISBURY, Geographic Geology;
SAMUEL W. WILLISTON, Vertebrate Paleontology; STUART WELLER, Invertebrate Paleontology;
ALBERT JOHANNSEN, Petrology; WALLACE W. ATWOOD, Physiography: William H. EMMONS,
Economic Geology; ROLLIN T. CHAMBERLIN, Dynamic Geology.

ASSOCIATE EDITORS
SIR ARCHIBALD Geikie, Great Britain; HEINRICH ROSENBUSCH, Germany; THEODOR N.
TSCHERNYSCHEW, Russia; CHARLES BARROIS, France; ALBRECHT PENCK, Germany; HANS
REUSCH, Norway; GERARD De GEER, Sweden; ORVILLE A. DERBY, Brasil; T. W. EDGEWORTH
DAVID, Australia; BAILEY WILLis, Argentine Republic; Grove K. GILBERT, Washington, D.C.;
CHAKLES D. WALCOTT, Smithsonian Institution; HENRY S. WILLIAMS, Cornell University; JOSEPH
P. IDDINGS, Washington, D.C.; JOHN C. BRANNER, Leland Stanford Junior University;
RICHARD A. F. Penrose, JR., Philadelphia, Pa.; WILLIAM B. CLARK, Johns Hopkins University;
WILLIAM H. HOBBs, University of Michigan; FRANK D, ADAMS, McGill University; CHARLES
K. LEITH, University of Wisconsin.

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