BULL. GEOL. SOC. AM, 



VOL. 23; 1911, PL. 26 



FiGiRE 1. — Eroded gravel Stratum in Bottom of axciext Channel 

 Looking east from poiut E on the map 



Figure 2. — Gravel over volcanic ash Stratum 



Four miles south of San tee, Nebraska, looliing west-southwest from poiut D. The 

 shoulder marks the gravel stratum and the white spots in the road the volcanic ash 



^»Muii^ , i ^j| 



IMBIIi 



Figure 3. — View east-northeast across the Hartingtox-Coleridge Valley 



PRE-WISCONSIN CHANNELS IN NORTHEASTERN NEBRASKA 



