Nearly all the implements found were of stone, exceedingly rude, being little else than stone flakes with one sharp edge; many of them having been resharpened and used as knives, scrapers, and skinners. Some had been worked into moderately fair perforators or drills for making holes in horn, bone, and shell--specimens of all these, with such holes, having been found here. The immense quantity of charred and fractured bones, not only of fish, birds, and the smaller quadrupeds, such as the rabbit and the fox, but also of the bear, wolf, elk, deer, and buffalo, shows that the occupants of this place lived chiefly by the chase, and hence must have used the bow and arrow and spear; yet, strange to say, although careful search was made for them, less than a dozen arrow and spear heads were found, and these so rude as scarcely to deserve the name. A single true chipped celt, three sandstones with mortar-shaped cavities, and a few mullers or stones used for grinding were obtained; also, some fragments of deer-horn, evidently cut round by some rude implement and then broken off, and several horn and bone punches and awls, one barbed and another with a hole through the larger end. The object in view in presenting these details is to give the reader an opportunity of judging for himself in reference to some inferences drawn from them. The form of the circular enclosure reminds us at the first glance of the palisade enclosures figured by De Bry,[16] which, according to Lafitau,[17] was the form usually adopted by the Indian tribes who were accustomed to erect such structures. We have here the almost exact circle, save where interrupted by the margin of the bluff, the overlapping of the ends, and the narrow entrance-way. We have here also the clay with which it was the custom, at least in the southern section, to plaster the palisades or which was cast against their bases as a means of supporting or bracing them at the bottom, a custom not entirely unknown among the northern tribes in former times. The indications are therefore very strong that this enclosing wall was originally a palisade which had been in part plastered with clay, or against which clay had been heaped to assist in rendering it firm and secure, and, if so, then it is probable it was built by Indians.