Circular houses of the same general architecture as those at the Harroun Site are typical of the Caddoan Area, especially during the Fulton Aspect period (Webb, 1940; Harrington, 1920; Newell and Krieger, 1949; Goldschmidt, 1935; Davis, 1958). Harrington (1920) reported several circular houses with extended entranceways found beneath sand mounds one to three feet high in southwestern Arkansas. Some of these houses had been built on the surface of the ground, some had been built in shallow pits, and others had been placed on low mounds. Most of them had been burned, and all were associated with typically Caddoan artifacts and with burned clay daub. Harrington thought the houses were earth lodges which had burned and collapsed, the earth from the walls and roofs falling over the house floors so as to form mounds. Webb (1940) reported architecturally similar houses at the Belcher Site in northwestern Louisiana, but presented a strong argument that they were wattle-and-daub houses and not earth lodges. It appears certain that the Harroun houses were also wattle-and-daub structures without any covering of earth. This conclusion is based on the following points: 1. The bodies of the mounds were composed of soft sand entirely unsuited for covering the sides and roofs of houses. It is doubtful if sand of this consistency would stick to a vertical or steeply sloping wall at all; but even if it did, it would surely be washed away with the first heavy rain. 2. The central portions of the Harroun mounds stood from two to three feet above the floors of the houses. If all this sand had fallen in from the tops of earth lodges, then the lodges must originally have had sand piled at least two or three feet thick on the middle of their roofs. This does not seem probable. 3. Fragments of burned, wattle-impressed, clay daub at all the Harroun houses indicate that the houses were plastered with clay, presumably on the outside. Burned clay daub apparently does not occur archeologically in association with true earth lodges in the plains. 4. Remains of true earth lodges in the Plains area show superficially as depressions, often with a low ring-shaped mound around the perimeter (Wedel, 1936: 24; Lehmer, 1954). Sometimes the depressions result in part from the shallow pits in which the lodges were built. But even when an earth lodge was built directly on a flat surface rather than in a pit, the mound left behind when the lodge collapsed has a concavity in the center instead of being convex as were the mounds at the Harroun Site. It is significant that Mound D was prominent and convex in shape even though the house it covered had been built in a pit. Certainly it is difficult to visualize an earth lodge—whether built in a pit or not—collapsing in such a manner as to produce a smoothly convex mound like those at the Harroun Site.