, Minnesota In the
Rocky Mountain National Park, for instance, there are archeological remains from about 3,850 and 3,400 B.C. of 42 low-walled stone structures or cairns, up to hundreds of feet in length, built for game drive systems. These slight walls served as devices that permitted hunters to direct or herd game animals—like bison, sheep, deer, or elk—toward men waiting with weapons. Up to twenty-five people may have been needed to execute the game drive. Hunters may have killed the animals using darts,
atlatl, spear throwers, or spears tipped with stone projectile points. The
Jones-Miller Bison Kill Site is an example of how the terrain was used about 8,000 B.C. as a game drive site. Remains of 300 bison were found in an
arroyo, or
draw, above the
Arikaree River basin. It was believed that the bison were strategically driven into an area difficult for the bison to traverse and easier to kill on three occasions. Because many of the animals were nursing calves, it is estimated that the kills occurred in late fall or winter. Waldo Rudolph Wendel said in 1986 that it was the "most carefully studied bison kill" site. ==Buffalo jump==