When we turn from the mastodon preserved in wet peat bogs, we come upon the camel and the sloth in dry caves. There, buried in dust, are skin, hair, and ligaments, as well as bone. Not a great deal of such remains exist, however, and only in a few caves—and this time “few” means less than five. It happens that dry and dust-filled caves are almost as good embalmers as the bogs of the Great Lakes or the ice of Siberia and the Alaska muck beds. “In a perfectly dry limestone cave,” says Howard, “covered by three to ten feet of dust, there seems to be no reason why the hair and tissue of the sloth, camel, horse, or bison could not have been preserved for several thousands of years.”[16] The Folsom Bison Not Extinct? Neither elephant nor sloth, neither horse nor camel, is such a common companion of the points of Folsom man as is an extinct form of bison. It was larger than the historic animal, and had longer and straighter horns. Though it is known variously as _Bison taylori_, _Bison antiquus antiquus_, and _Bison antiquus figgensi_, it was probably of a single type, the last named. Now one of the significant things about Folsom is that the point never turns up with the modern variety of buffalo which goes by the interesting name of _Bison bison_,[17] or even _Bison bison bison_—unless, of course, lack of skull material has led scientists astray. Therefore, if we seek the latest date of Folsom, it would seem as if we must seek the death day of the extinct bison. [Illustration: _Prehistoric and modern bison. Above, at the left, is an outline of typical horn cones of_ Bison antiquus antiquus, _whose bones have been found with Folsom points. Its horns were longer and straighter than those of the buffalo of today_, Bison bison, _shown at the right. Below is a still larger and more ancient type_, Bison latifrons, _with an eighty-inch span_.]