THE 
^mr 
Pan-American 'JUi 1 i 
Geologist^ 
A Monthly Journal devoted to Speculative 
Geology, Constructive Geologicae Criticism, 
AND Geological Record 
Edited by 
Charles Keyes, Des Moines, Iowa 
Associate Editors ; 
Prof. Edward W. Berry, Baltimore, Md. 
Dr. Henry S. Washington, Washington, D. C. 
Prof. Gilbert D. Harris, Ithaca, N. Y, 
\ OL. XXXVII 
Junk, 1922 
No. 5 
Contents 
Rightful Demesne of Petrology, by Charles P. Berkey 
Oldest Known Peccary from America, by Plarold J. Cook . 
SuMMiTAL Plain of the Colorado Rockies, by Charles Keyes 
Age of Talladega Slates of Alabama, by William F. Prouty 
Origin of Bolivian Copper Deposits, by J. T. Singewald, Jr., and 
Edward W. Berry . . . .. 
Yadose Ore Deposition, by Charles Keyes. 
Editorial. 
Mixeralogical Geology .. 
Stratigraphical Geology. 
Index . 
353 
357 
359 
363 
367 
379 
393 
399 
417 
427 
PUBLISHED BY 
geological publishing company 
DES MOINES, IOWA 
