NO. 4 



SAN JON DISTRICT, NEW MEXICO ROBERTS 



found between the latter animal and artifacts at this location, implies 

 some antiquity. That contemporaneity of Indians and the mammoth 

 in this region was within the bounds of possibility is indicated by the 

 finds near Clovis (Howard, 1935; Cotter, 1937), at Sandia Cave 

 (Hibben, 1941), and in various Texas sites (Sellards, 1940). 



The second type of point, a characteristic Yuma of the form desig- 

 nated the Collateral (Wormington, 1939) and since the 1941 Santa Fe 



J 



a 



Fig. 2. — Some projectile point types, a, San Jon; c, Collateral or Eden Valley 

 Yuma; b, and d, unnamed forms. (Actual size.) 



conference tentatively called the Eden Valley Yuma, comes from a 

 mixed layer of reddish clay and sand and is found in association 

 with bones from an essentially modern species of bison, a much 

 smaller animal than that of the lower level. The bones show some 

 fossilization, although it is in much less degree than that of the first 

 group. Geologic evidence is that this horizon was separated from 

 the first by an appreciable period of erosion followed by marked 

 deposition. This argues for considerable time lapse and a much 

 younger age for the cultural material. The Collateral or Eden Valley 



