NO. 4 



SAN JON DISTRICT, NEW MEXICO ROBERTS 



stratigraphic horizons and while actual superposition of specimens 

 was lacking, the geologic nature of the layers is such that there seems 

 little reason to doubt that the sequence indicated is correct. A fifth 

 type was found in a buried occupation level in the lower plain. Its 

 position in the sequence is somewhat doubtful at present writing, 

 yet it seems to be approximately contemporaneous with the third or 

 next to most recent in the series from the basin. 



Fig. I. — Map showing outline of main arroyos in the basin and the break 

 through the escarpment. Location of work areas, trenches, and places where 

 bones were found without accompanying artifacts are also indicated. 



The earliest type of point, a rather roughly chipped, thick-bodied 

 blade with a square base, parallel sides and rounding tip (fig. 2, a), 

 occurred in a layer of dark earth corresponding to the top level of 

 the silt in one of the old ponds or lake beds. The point in general 

 might be considered as an example of the Indeterminate Yuma 

 (Wormington, 1939), but the lack of many of the characteristic 

 minor details makes its assignment to that classification debatable. 

 This doubtful status is accentuated by the fact that many obviously 

 unrelated forms have been lumped together under the name Indeter- 



