4:66 B. Smith — New Locality for Castor oides. 



The time range of Castoroides oliioensis must be extended 

 back as far as the Aftonian interglacial epoch.* On the other 

 hand, there is some evidence in favor of its contemporaneity 

 with the North American Indian of the Delaware Valley.f 

 In any case it is generally recognized that the species survived 

 the final glaciation. Of the specimen which has formed the 

 subject of this note it can be said that it came from a forma- 

 tion (the Cowaselon Clay) which was deposited in a water body 

 whose level was apparently well below that of the last ice- 

 controlled lake, and that its position in the Quatenary time 

 scale is probably much nearer to the present than to the period 

 of ice-margin retreat. 



No attempt will here be made to definitely correlate the 

 Clyde and Cowaselon finds. In this connection, however, it is 

 well to call attention to the fact that both of the New York 

 examples of Castoroides were obtained from the low level 

 swamp and lake system which extends in an east and west belt 

 through the central portion of the state and whose deposits 

 seldom rise far above the 400-foot contour line. 



Department of Geology, Syracuse University. 



* " Pleistocene of Sioux Falls, South Dakota and Vicinity," B. Shimek, 

 Bull. Geol. Soc. Am., vol. xxiii, pp. 143 and 148. 



f " Ee-exploration of Hartman's Cave near Stroudsburg, Pa., in 1893," 

 H. C. Mercer. Proc. Acad. Nat. Sci. Phila,, pp. 96-104, 1894. 



