54 ON THE PROBOSCIDEAN FOSSILS OF THE PLEISTOCENE DEPOSITS. 



shallow depths on the area- of the lowan drift. The3' are post' 

 lowan. 



Twelve fossils are reported from the area of the Wisconsin 

 drift. Two of these were teeth, presumably not in situ, as they 

 were taken from gravel. One, a part of a mastodon skeleton, was 

 taken from a tenacious clay on the early Wisconsin drift (Cham- 

 paign till sheet of Leverett) near Fairmount, in Vermilion county, 

 in Illinois. The others have come from low and swampy places on 

 the but slightly modified surface of this late till. They seem to 

 belong in the soil on the drift or in local accumulations of wash or 

 perhaps incipient loess deposits on low divides where the drift 

 is practically yet untouched by erosion. These are clearlj' post- 

 Wisconsin in age. 



In some dozen cases, considerable parts of skeletons, or at 

 least a few bones, with or without some teeth, but enough to indi- 

 cate that the remains were practically in place, have been found 

 in alluvial sediments. Some of these are evidently much older 

 than the others. Bones are thus mentioned by Professor Calvin 

 as having been found in a well at a depth of fifty feet in the Tar- 

 kio valley, on the Kansan drift, near Blanchard, in Iowa. Other 

 finds were made in alluvium on driftless territory, as in Gallatin 

 county, in Illinois, and in Allamakee county, in Iowa. All these 

 may be older than the fossils which come fi*om alluvium or later 

 drifts. One mastodon came from the alluvium along Illinois river; 

 three miles east of Morris. Most of the alluvium in this valley 

 must be as late as Lake Chicago, which drained in this direction. 

 It appears certain that both the elephant and the mastodon are 

 represented among the alluvial fossils, on the Wisconsin drift. 

 The}' are both of post-Wisconsin age, and, judging from their oc- 

 casional shallow interment in alluvium, in loess, and in modified 

 surface drift, they are sub-recent. 



In tabulated form, the relal ion of the proboscidian remains to 

 the members of the drift are as below: 



