VOLUME XXX NUMBER 1 



THE 



Journal of Geology 



A Semi-Quarterly 



Edited By 



THOMAS C. CIIAMBERLIN AND ROLLIN D. SALISBURY 



With the Active Collaboration of 



STUART WELLER, Invertebrate Paleontologj* ALBL;RT JOHANNSEN, Petrology 



EDSON S. BASTIN, Economic Geology ROLLIN T. CHAMBERLIN, Dynamic Geology 



ASSOCIATE EDITORS 



SIR ARCHIBALD GEIKIE, Great Britain JOHN C. BRANNER, Leland Stanford Junior University 



CHARLES BARROIS, France RICHARD A. F. PENROSE, Jr., Philadelphia, Pa. 



ALBRECHT PENCK, Germany WILLIAM H. HOBBS, University of Michigan 



HANS REUSCH, Norway FRANK D. ADAMS, McGill University 



GERARD DeGEER, Sweden CHARLES K. LEITH, University of Wisconsin 



SIR T. W. EDGEWORTH DAVID, AustraKa WALLACE W. ATWOOD, Clark University 



BAILEY WILLIS, Leland Stanford Junior University WILLIAM H. EMMONS, University of Minnesota 



CHARLES D. WALCOTT, Smithsonian Institution ARTHUR L. DAY, Carnegie Institution 



JANUARY-FEBRUARY 1922 



AN OUTLINE OF THE GEOLOGY OF NEW ZEALAND - - - - W. N. Benson i 



PENNSYLVANIAN STRATIGRAPHY OF NORTH CENTRAL TEXAS 



Raymond C. Moore and Feederick B. Plummer i8 



PLEISTOCENE MOLLUSCA FROM NORTHWESTERN AND CENTRAL ILLINOIS 



Frank Collins Baker 43 



THE MUDDY MOUNTAIN OVERTHRUST IN SOUTHEASTERN NEVADA 



* Chester R. Longwell 63 



GROWTH-STAGES OF THE BLASTOID, OROPHOCRINUS STELLIFORMIS F. A. Bather 73 



POSSIBLE SILURIAN TILLITE IN SOUTHEASTERN BRITISH COLUMBIA - 



Frax^^- *>. 



REVIEWS /^^^ . - - t/^^. 



fEB 20 1<J^ 



THE UNIVERSITY OF CHICAGO P^^^g^ar Mu^«^ 



CHICAGO, ILLINOIS, U. S. A. ^''**^. „.-..,--.-— -^ 



THE CAMBRIDGE UNIVERSITY PRESS, London 



THE MARUZEN-KABUSHIKI-KAISHA, Tokyo, Osaka, Kyoto, Fukuoka, Sendai 



THE MISSION BOOK COMPANY, Shanghai 



^-1 



