_House No. 3_ This house was erected on the surface of the floodplain before the mound was built. The purpose of the mound apparently was to bury the remains of the house after it had burned. Beneath the house floor zone, which was described in the preceding section, were found 59 post molds measuring from 0.25 to 1.3 feet in diameter and extending from 0.3 to 2.5 feet below the floor (Fig. 5). The faint gray stain of the post molds was quite dim and difficult to distinguish. They were located by cutting a vertical face completely around the house area, then carefully cutting the face inward from all sides. As the post molds were located, they were plotted on a horizontal plan and a measured profile drawing of each was prepared. Twenty-three of the post molds formed a circular outline representing the perimeter of a house approximately 17 feet in diameter (Fig. 5). The peripheral molds averaged 0.5 feet in diameter and were spaced, as a rule, about two feet apart. At the southeast edge of the house were two parallel lines of three molds each which defined an extended entranceway. Because of disturbance in the entranceway area by tree roots, only the bottom portions of the entrance molds were preserved. Their arrangement suggests that some of the post molds related to the original entranceway were not discovered. Within the external ring of post molds were 30 irregularly spaced molds, including four very large ones which probably held the bases of relatively heavy roof supports. Two concentrations of smaller post molds (one on the northeast side of the house, the other on the southwest side) possibly mark the location of interior structures such as sleeping or storage platforms. In the center of the house was a relatively large post mold, over which the fire hearth had been built. This probably represented a center post used in construction of the house and then removed when the house was completed. The hearth was located in a shallow depression at the center of the house. It was in the form of a basin about four feet in diameter and one foot deep. The sandy soil underlying the hearth had been burned to a deep reddish color. [Illustration: Fig. 5 HARROUN SITE 41 UR 10 PLAN OF HOUSE NO. 3 MOUND B post mold, exterior wall post mold, interior post mold, entrance central hearth stump disturbance]