This is one of the ridges known as a buffalo jump. Once they had horses, the Native American's would stampede a portion of the huge buffalo herds crossing the prairie over the edge of this hole where they would fall to their death. Other warriors would surround the bottom and move in to kill the animals that did not die from the fall. Almost every bit of the buffalo was used by the indians but the 20 layers of bones found to date indicate this site was used for many years. The "dig" is locked up with a heavy metal door after Labor Day so we didn't get to see the actually excavation site.