NUMBER 2 
THE 
OURNAL OF OLOGY 
A SEMI- QUARTERLY 
EDITED BY | 
THOMAS C. CHAMBERLIN AND ROLLIN D. SALISBURY 
With the Active Collaboration of 
SAMUEL W. WILLISTON, Vertebrate Paleontology - ALBERT JOHANNSEN, Petrology 
STUART WELLER, Invertebrate Paleontology ROLLIN T. CHAMBERLIN, Dynamic Bealeey 
pga D. BROKAW, Economic Geology 
ASSOCIATE EDITORS 
SIR ARCHIBALD GEIKIE, Great Britain JOSEPH P. IDDINGS, Washington, D.C. 
CHARLES BARROIS, France JOHN C. BRANNER, Leland Stanford Junior University 
ALBRECHT PENCK, Germany RICHARD A. F. PENROSE, Jr., Philadelphia, Pa. 
SS GEC oe WILLIAM H. HOBBS, University of Michigan 
Nghia FRANK D. ADAMS, McGill University” 
_ T. W. EDGEWORTH DAVID, Australia 
BAILEY WILLIS, Leland Stanford Junior University CHARLES K. LEITH, University of Wisconsin \ 
GROVE K. GILBERT, Washington, D.C. WALLACE W. ATWOOD, Harvard University 
CHARLES D. WALCOTT, Smithsonian Institution WILLIAM H. EMMONS, University of Minnesota 
HENRY S. WILLIAMS, Cornell University : ARTHUR L. DAY, Carnegie Institution 
FEBRUARY-MARCH 1918 
GENESIS OF THE ALKALINE ROCKS - - - - - = - RecinaAtp A. DAty 07 
CONDITIONS OF DEPOSITION ON THE CONTINENTAL SHELF AND, SLOPE 
C.. A. Corron 135 
THE NORTHWARD EXTENSION OF THE PHYSIOGRAPHIC DIVISIONS OF THE 
NUnEN SACHS Mt or ere tere San es Gee WN. TSAVER | 760 
PETROLOGICAL ABSTRACTS AND REVIEWS - - - - ALBERT JOHANNSEN 186 
FEUD ube hiSys foeea eo Sheer ubadere heen: es castaed utp Sa ane ARES ES ag ae OR RIES fore 
DEB olININMAE RSLDY OF “© HhiCGAGO: PRESS 
CHICAGO, ILLINOIS, U.S.A. 
THE CAMBRIDGE UNIVERSITY PRESS, Lonpon anp EDINBURGH 
THE MARUZEN-KABUSHIKI-KAISHA, Tokyo, Osaka, Kyoto, FukKuoks, SENDAI 
THE MISSION BOOK COMPANY, SHancuat 
