,UWS u,8,|„ 
I 6 1523 
Pan-American 
Geologist 
A M0NTHI.Y JOURNAI, D£VOTED TO SPECULATIVE 
Geology, Constructive Geological Criticism, 
AND Geological Record 
Edited by 
Charles Keyes, Des Moines, Iowa 
Associate Editors: 
Prof. Edward W. Berry, Baltimore, Md. 
Prof. Gilbert D. Harris, Ithaca, N. Y. 
VoL. XXXVIII December, 1922 No. 5 
V. 3 8 
/V'O 5 
- THE 
CONTE^NTS 
Page 
Bridging the Ages oe Ice, by Charles Keyes . . . 
Glacial Border oe Spokane, by Thomas Large .... 
Positions oe the Ancient Continents, by Rudolph Ruedemann . 
Southernmost Extension oe Kansas Tills, by Walter H. Schoewe 
Glacial Driet Sheets in Minnesota, by Frederick W. Sardeson . 
Ceramics oe Gumbo Soils, by Charles Keyes .... 
Editorial. 
Glacial Geology. 
Index.. 
349 
359 
367 
378 
383 
403 
409 
413 
425 
PUBLISHED BY 
geological publishing company 
DES MOINES, IOWA 
