vi CONTENTS TO VOLUME XXI 
THE SECONDARY PRECIPITATION OF GOLD IN Ore Boptes. Albert D. 
Brokaw : : : 4 : : 
ORIGINAL STREAMS; AND THEIR ROLE IN GENERAL DESERT-LEVELING. 
Charles R. Keyes 
THE NATURE OF THE LATER DEFORMATIONS IN CERTAIN RANGES OF 
THE GREAT Basin. Charles Laurence Baker . 
EDITORIAL 
REVIEWS 
NUMBER IV 
GLACIAL DEPOSITS OF THE CONTINENTAL TYPE IN ALasKA. R. S. 
Tarr and Lawrence Martin . 
THE UNCONFORMITY AT THE BASE OF THE ONONDAGA LIMESTONE IN 
New YorK AND Its EQUIVALENT WEST OF BUFFALO. Edward M. 
Kindle satay ; : : 2 ; 
Sections OF Two MicuicaNn SALT WELLS. William H. Fry 
THE HurON AND CLEVELAND SHALES OF NORTHERN OHIO. Charles S. 
Prosser 
OSTODOLEPIS BREVISPINATUS, A NEW REPTILE FROM THE PERMIAN OF 
Texas. S. W. Williston 
NoTE ON THE GEOLOGY OF THE ISLE OF PINES, CuBA. O. E. Jennings 
REVIEWS 
RECENT PUBLICATIONS 
NUMBER V 
THE SIGNIFICANCE OF RECENT DEVELOPMENTS IN THE PRE-CAMBRIAN 
STRATIGRAPHY OF THE LAKE SUPERIOR-LAKE HURON REGION. 
Morley E. Wilson 
THE ORDER OF CRYSTALLIZATION IN IGNEOUS Rocks. N. L. Bowen 
PSEUDOBRECCIATION IN ORDOVICIAN LIMESTONES IN MANITOBA. 
ROVGe Wallace: 
VARIATIONS OF GLACIERS. XVII. Harry Fielding Reid 
THE EXTENT OF THE CORDILLERAN ICE-SHEET. Charles A. Stewart 
AN EXPOSURE SHOWING Post-KANSAN GLACIATION NEAR Iowa Clty, 
Iowa. Morris M. Leighton 
RECONNAISSANCE IN THE SOUTHERN WASATCH Mountatns, UTAH. 
G. F. Loughlin 
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