ish 
JOURNAL OF GEOLOGY 
A Semi-Quarterly Magazine of Geology and 
Related Sciences 
EDITORS 
Tuomas C, CHAMBERLIN, 7” General Charge; Roxuin D, Satissury, Geographic Geology; 
SamuE- W. Wituiston, Vertebrate Paleontology; STUART WELLER, /xvertebrate Paleontology; 
ALBERT JOHANNSEN, Petrology; WatLacE W. Atwoop, Phystography; Wittiam H. Emmons, 
Economic Geology; Rotiin T. CHAMBERLIN, Dynamic Geology. 
ASSOCIATE EDITORS 
S1k ARCHIBALD GEIKIE, Great Britain; HEINRICH ROSENBUSCH, Germany; THEODOR N. 
TSCHERNYSCHEW, Russza; CHARLES BARROIS, France; ALBRECHT PENCK, Germany; HANns 
Reuscu, Vorway,; GERARD DE GEER, Sweden; ORvILLE A. Dersy, Brazz/; T. W. EpGEworTH - 
Davip, Australia; Baitey WILLIS, Argentine Republic; Grove K, GILBERT, Washington, D.C.; 
Cuaxries D, WaAtcott, Smzthsontan Institution; HENRY S. WILLIAMS, Cornell University; JOSEPH 
P. Ippincs, Washington, D.C.; JoHN C. BRANNER, Leland Stanford Junior University; 
RicHarp A. F. PENROSE, JR., Philadelphia, Pa.; Wititam B, Crark, Johns Hopkins University; 
WitiiAmM H. Hosss, University of Michtgan; FRANK D, Apams, MeGzll Untversitty; CHARLES 
K. Leitu, University of Wisconsin. 
VORUNME X XT 
JANUARY-DECEMBER, 1913 
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THE UNIVERSITY OF CHICAGO PRESS 
CHICAGO, ILLINOIS 
