NUMBER 5 
EOLOGY 
a SEMI QUARTERLY 
EDITED BY 
THOMAS C. CHAMBERLIN AND ROLLIN D. SALISBURY 
With the Active Collaboration of 
SAMUEL W. WILLISTON, Vertebrate Paleontology — ‘ee ALBERT JOHANNSEN, Petrology 
~ STUART WELLER, Invertebrate Paleontology ROLLIN T. CHAMBERLIN, Dynamic Geology 
ALBERT D. BROKAW, Economic Geology 
ASSOCLATE EDITORS 
ec SER 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. 
HANS REUSCH, Norway WILLIAM H. HOBBS, University of Michigan 
GERARD DEGEER, Sweden ; eee, 
_T. W. EDGEWORTH DAVID, Australia 
BAILEY WILLIS, Leland Stanford Junior University’ 
FRANK D. ADAMS, McGill 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 
~ *Deceased. 
CORAL REEFS AND SUBMARINE BANKS - Leia 
2H, 
Ma 
THE IRON-FORMATION ON BELCHER ISLANDS, HUDSON al tages 
SSE tohycte TOTES elk AND — ASSOCIATED ALGAL LIMESTONES 
E. S. Moore 412 
INTERNAL STRUCTURES OF IGNEOUS ROCKS: ‘THEIR SIGNIFICANCE AND ORIGIN; 
- . Me Davis 385 
WITH SPECIAL REFERENCE TO THE DULUTH GABBRO - Frank F. Grout 439 
THE HABITAT OF THE SAUROPOD DINOSAURS -. - - - Cartes C. Moox 459 
PETROLOGICAL ABSTRACTS AND REVIEWS - - - -  - ArpERT JOHANNSEN 471 
EEE OS Ne etd UE hcnitiuin bwiaed pam... a4 Aa opE 
THE UNIVERSITY OF CHICAGO PRESS 
CHICAGO, ILLINOIS, U.S.A. 
THE CAMBRIDGE UNIVERSITY PRESS, Lonpon anp Epinpurca 
THE MARUZEN-KABUSHIKI-KAISHA, Toxyo, Osaka, Kyoto, Fukuoka, SENDAI 
THE MISSION BOOK COMPANY, SHANGHAI 
