VOLUME XX (2 50 42 Cae 1 
; i Q ati al Museu 
THE a 
JOURNAL or GEOLOGY 
fins Mop 
A SEMI- QUARTERLY hes 
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, EDITED BY \ 
THOMAS C. CHAMBERLIN AND ROLLIN D. SALISBURY 
With the Active Collaboration of 
_SAMUEL W. WILLISTON ALBERT JOHANNSEN WILLIAM H. EMMONS 
Vertebrate Paleontology Petrology Economic Geology 
STUART WELLER 2 WALLACE W. ATWOOD ROLLIN T. CHAMBERLIN 
Invertebrate Paleontology Physiography Dynamic Geology 
ASSOCIATE EDITORS 
SIR ARCHIBALD GEIKIE, Great Britain GROVE K. GILBERT, National Survey, Washington, D.C. 
HEINRICH ROSENBUSCH, Germany CHARLES D. WALCOTT, Smithsonian Institution 
THEODOR N. TSCHERNYSCHEW, Russia HENRY S. WILLIAMS, Cornell University 
5 CHARLES BARROIS, France > JOSEPH P.IDDINGS, Washington, D.C. 
. ALBRECHT PENCK, Germany JOHN C. BRANNER, Stanford University 
HANS REUSCH, Norway RICHARD A. F. PENROSE, Jr., Philadelphia, Pa. 
GERARD DEGEER, Sweden : WILLIAM B. CLARK, Johns Hopkins University 
ORVILLE A. DERBY, Brazil WILLIAM H. HOBBS, University of Michigan 
T. W. EDGEWORTH DAVID, Australia FRANK D. ADAMS, McGill University 
BAILEY WILLIS, Argentine Republic CHARLES K. LEITH, University of Wisconsin 
JANUARY-FEBRUARY, 1912 
CONTENTS 
THE PERMO- CAR EUR OE OF NORTHERN NEW MEXICO 
S. W. WILLISTON AND FE: C. CASE I 
ON THE DISTRIBUTION OF LOWER TRIASSIC FAUNAS \- JAMES PERRIN SMITH 13 
PORAN MME US CGORDARUS COPE jo 32.) 28) es Miaeerce’ Gs Merny ~ 21 
NOTES ON TERTIARY DEPOSITS NEAR COALINGA OIL FIELD AND THEIR STRATI- 
GRAPHIC RELATIONS WITH THE UPPER CRETACEOUS - - E.T.Dumpre 28 © 
- KAURI GUM MINING IN NEW ZEALAND a0 Se a ee RAS PENROSE ~R 00) 38 
_ PRELIMINARY NOTES ON SOME IGNEOUS ROCKS OF JAPAN. V - - S.Kozu. 45 
GRAVEL AS A RESISTANT ROCK ee ty ee ee et Sroneyy PAIGE A719 
SOME OBSERVATIONS AND EXPERIMENTS ON JOINT PLANES. I Peart SHELDON 53 
PETROLOGICAL ABSTRACTS AND FRET S  eO e ete ee 
PORNEC NS Scie ape, ee ee hr ie Pe RN ee a, He ie om 
Ne [oii Sia ad uA Naas 
F gees a ’ Mi 
Che University of Chicago press 
CHICAGO, ILLINOIS 
AGENTS: 
THE CAMBRIDGE UNIVERSITY PRESS, Lonpon Anp EDINBURGH 
Ni aey WILLIAM WESLEY & SON, Lonpon 
so _ TH. STAUFFER, Letpzic | 
¥s THE ‘MARUZEN-KABUSHIKI-KAISHA, Toxyvo, Osaxa§ Kyoro 
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