- VOLUME XX! NUMBER 5 
THE 
JOURNAL orf GEOLOGY 
A SEMI-QUARTERLY 
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 
eae WELLER WALLACE W. ATWOOD ROLLIN T. CHAMBERLIN 
: Invertebrate Paleontology Physiography Dynamic Geology 
ASSOCIATE EDITORS 
SIR ARCHIBALD GEIKIE, Great Britain : GROVE K. GILBERT, Washington, D.C. 
_ HEINRICH ROSENBUSCH, Germany CHARLES D. WALCOTT, Smithsonian Institution 
- THEODOR N, TSCHERNYSCHEW, Russia HENRY S. WILLIAMS, Cornell University 
_ CHARLES BARROIS, France JOSEPH P.IDDINGS, Washington, D.C. 
_ ALBRECHT PENCK, Germany JOHN C, BRANNER, Leland Stanford Junior 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 
TURYSAWIGUST 1913 
THE SIGNIFICANCE OF RECENT DEVELOPMENTS IN THE PRE-CAMBRIAN STRA- 
TIGRAPHY OF THE LAKE SUPERIOR-LAKE HURON REGION Mor ey E. Witson 
THE ORDER OF CRYSTALLIZATION IN IGNEOUS ROCKS - - - - N.L. Bowren 
_ PSEUDOBRECCIATION IN ORDOVICIAN LIMESTONES IN MANITOBA | R. C. WaLLacE 
_ VARIATIONS OF GLACIERS. XVII - - - - - - Harry FIeLpinc REID 
/ THE EXTENT OF THE CORDILLERAN ICE-SHEET - - -  CwHartes A. STEWART 
AN EXPOSURE SHOWING POST-KANSAN GLACIATION NEAR IOWA CITY, IOWA 
Morris M. LEIGHTON 
RECONNAISSANCE IN THE SOUTHERN WASATCH MOUNTAINS, UTAH 
G. F. LouGHLIn 
NEW SPECIES FROM THE SANTA LUCIA MOUNTAINS, CALIFORNIA, WITH A DIS- 
CUSSION OF THE JURASSIC AGE OF THE SLATES AT SLATE’S SPRINGS 
CHARLES H. Davis 
GLACIAL POT-HOLES AT CROWN POINT, NEW YORK - - E. EUGENE BARKER 
REVIEWS - - - - - = : = = : = 3 u _ 2 2 
RECENT PUBLICATIONS - - : - - z s Z 2 r “ 2 = s 
Pee NIV ERSTE Y OF CHICAGO) PRESS 
CHICAGO, ILLINOIS, U.S.A. 
AGENTS 
THE CAMBRIDGE UNIVERSITY PRESS, Lonpon anv EDINBURGH 
WILLIAM WESLEY & SON, Lonpon 
KARL W. HIERSEMANN, Lerpzic 
THE MARUZEN-KABUSHIKI-KAISHA, Toxyo, Osaxa, Kyoto 
469 
