BULL. GEOL. SOC. AM. 



VOL. 27, 1915, PL. 14 



Figure 1. — Looking across the Old Pleistocene Valley of the Missouri and 

 Yellowstone Rivers near Glen Ullin, northwestern Morton County, North 

 Dakota. 



..-....- ' r '"'■■" ' ' ' 



S4 ..-;./• ?: ::>. ■■:■■;■' 



Figure 2. — Broad Pleistocene Valley or the Yellowstone River, looking east 

 through the Valley toward the Little Missouri River, western McKenzie 

 County, North Dakota. 



OLD PLEISTOCENE VALLEYS IN WESTERN NORTH DAKOTA 



