It is quite possible as pointed out by Lewis[132] that the introduction of the buffalo skin covered lodge which probably came after the advent of the horse into this region, had something to do with the apparent scarcity of the semi-subterranean winter house in the Yakima region in historic times, the buffalo skin lodge possibly having taken the place of the earth-covered dwellings. [132] Lewis, p. 186. The so-called cremation circles near Cherry Creek and near the mouth of the Naches which were mentioned on pp. 12 and 15 and described on pp. 163 and 157, may be the remains of small houses of the type of semi-subterranean winter house sites that were made especially as grave houses. As before mentioned, this type of semi-subterranean circular lodge is found as far north as the Thompson River country, and I have seen one site on the prairie near Rochester, Thurston Co., probably of this type. In the Nez Perce region to the east, remains that appear like those of semi-subterranean houses consisting of ridges of earth about a foot above the general level of the ground, surrounding a circular pit, from three to five feet deep, measuring from the top of the ridge; and about seventy feet in diameter, are found near the mouth of Tammany Creek on the east bank of Snake River, a few miles above Lewiston. The site may be identified with Hasutin.[133] The place is known to have been used as a camp until about 1878, especially during the season of lamprey eel fishing. These house rings are in several groups. A little charcoal, some unio shell, flint chips, a digging stick with a bone handle, glass beads and other objects are reported to have been found in them. Somewhat similar house rings about twenty-five feet in diameter were found on the south bank of the Middle fork of Clearwater River, near the town of Kooskia. Spinden[134] refers to Lewis and Clark[135] for evidence of considerable antiquity for the circular house rings in this Nez Perce region. They mention one as being about thirty feet in diameter with a rim over three feet high and the floor sunken four feet below the surface of the ground or seven feet below the top of the rim. The Mountain Snakes, according to Ross[136] never used underground houses. [133] Spinden p. 179. [134] Spinden, p. 197. [135] Lewis and Clark, V, p. 33. [136] Ross, (b), II, p. 117.