50 ON THE PROBOSCIDEAN FOSSILS OF THE PLEISTOCENE DEPOSITS. 



Table of specific Determinations. 





Q, E/J 



_ 3-e 



CO OJ 



cd p. 





"Mammoth'' 



"Elephas primigenius". 

 "Elephas americanus". 



"Mastodon" 



"Elephant" 



"Proboscidean", "elephant or mastodon", "mam- 

 moth or mastodon" 



13 



5 



K?) 

 24 



7 



Relation to Different Parts of the Drift. 



The relation of these fossils to the different drifts in the Mis- 

 sissippi valley is by no means clear in every case. Many of the 

 observations were made long before different drifts had been rec- 

 ognized, and some were even made by geologists who did not re- 

 gard land ice as necessarily an agent in the deposition of the gla- 

 cial till. A thorough study of the geological position of these fos- 

 sils would require visits to many of the localities in the field. 

 Though this is impracticable, the data in the list warrant some 

 general observations in this line. 



In fifteen cases, the notes furnished by the observers quoted 

 either give insufficient or no data from which we may judge of the 

 relations of the fossil to the drift. These are mosth^ in cases of 

 discoveries of single teeth or tusks. In fourteen instances it is 

 only known that the remains, likewise mostly teeth, came from 

 some creek or from some river. One tooth is reported as having 

 been caught in a seine. Others are spoken of as exposed in bapks 

 of streams, and where these consist of single bones or teeth, one 

 must regard them as in transit an (J not necessarily as fossils 



