680 THE ICE AGE IN NORTH AMERICA. 



deposit of Iowan age. My own personal investigations on 

 the ground amply sustain this view as will appear from study of 

 the accompanying illustrations. 



The remnant of loess is protected on a rocky promontory 

 left between the main valley of the Missouri and a small 

 stream whose channel dates from preglacial times. The 

 stratum near the bottom of the tunnel in which the skeleton 

 was found is between eleven and twelve feet above the extreme 

 present highwater mark of the river, while the loess overlying 

 the skeleton is twenty feet thick; and loess underlies the house 



Fig. 188 — View showing entrance to tunnel in which the Lansing Skeleton was found 

 (Courtesy of Records of the Past.) 



still several feet higher, and mantles the narrow slope well 

 up to the 200 foot level constituting the loess plain which 

 furnishes the location for the city of Leavenworth, a short 

 distance away. West of the tunnel, also, the loess slopes 

 rapidly upwards to the same level. 



The most conclusive witness to the original and undis- 

 turbed character of the deposit in which the tunnel was exca- 

 vated will be seen from a study of the accompanying map. 

 The bottom of the tunnel is on a rock exposure of limestone 

 whose outcrop extends from B to the side ravine, where, after 

 a short interruption, it appears on the other side westward to 



