San Jon Probably contemporaneous with the Folsom people were others who made thick, roughly flaked, square-based points with parallel sides. These points were first found near the town of San Jon, New Mexico, and are named after it.[114] Yuma From a somewhat later period we have evidence of ancient hunters who made some of the most beautifully flaked stone projectile points that have ever been created. These points, which were first found in Yuma County, Colorado, are known as _Yuma_ or _Parallel Flaked Points_. They are of two types.[130] One is marked by the removal of long narrow spalls running obliquely across the blade and the other is characterized by the removal of shell-shaped spalls from either side which tends to give the point a diamond shaped cross-section. Gypsum Cave Evidence of another early hunting culture of the Southwest was found in Gypsum Cave, Nevada.[47] Here were found lozenge-shaped projectile points, about two inches long, with small convex stems. They were associated with the remains of now extinct ground sloth and llamalike camels. The time of the first occupation of Gypsum Cave may have been several thousand years B.C. One thing which makes this find of particular interest is that, due to the protection afforded by the cave, some normally perishable material was preserved. Painted dart shafts and foreshafts were found and also a piece of basketry. Lacking direct association with Gypsum Cave type points or extinct animal remains, it is impossible to state with certainty that the basketry belonged to this ancient culture, but there is every reason to believe that it did, since it was found under a stalagmitic growth and is of a type different from that of later cultures. Cochise While hunters roamed the plains farther north there were other people, with a different type of economy, living in what is now southeastern Arizona and southwestern New Mexico.[118] This culture, to which the name _Cochise_ has been given, is believed to have begun over 10,000 years ago and to have lasted until 500 B.C. or later. The chief characteristic of the Cochise culture is the extensive use of grinding stones which suggests that the people were primarily dependent on the gathering of wild grains, nuts, roots, and similar foods. The finding of some split and burned animal bones in the sites where they lived indicates that they did hunt, but the lack of projectile points in the earliest period and their scarcity until the most recent phase provides additional evidence that the economy was based on food gathering rather than on hunting. [Illustration: Fig. 3—Projectile points of the most ancient cultures. a. Sandia, b. Folsom, c. San Jon, d. Eden Yuma, e. Oblique Yuma, f. Gypsum Cave.]