Around the perimeter of the floor was a ring of post molds representing the exterior house wall (Fig. 8). Average diameter of the ring was 18 feet. Each post mold extended downward below the floor level into the sub-mound floodplain. The individual molds ranged from 0.35 to 0.75 feet in diameter, the bottoms being from 1.3 to 2.0 feet below the floor level. There was a total of 29 definite molds plus one probable mold in the peripheral ring, and disturbances on the west and south sides of the house appeared to have obliterated at least five others. The posts had been set about 1.5 to 2.0 feet apart on an average. Time did not permit vertical sectioning of all the molds, but several were carefully sectioned and studied to determine the level from which they had been dug. All began at the floor of House No. 1, none extending above that level. The large pothole observed in the top of the mound continued downward entirely through the floor of House No. 1, although it had narrowed to a diameter of less than four feet where it intercepted the floor (Fig. 8). Unfortunately the pothole had destroyed the major portion of a centrally located hearth that must have been associated either with House No. 1 or the overlying House No. 2. Actually, there was probably a hearth for each house, the later one constructed directly above the earlier one. But since only a narrow segment of burned soil remained to mark the eastern margin of the hearth (or hearths), the structural details could not be ascertained. As nearly as could be estimated by the surviving portion of the hearth, it must have been approximately three feet in diameter. [Illustration: Fig. 8 HARROUN SITE 41 UR 10 PLAN OF HOUSES NO. 1 & 2 MOUND C post mold, House No. 1 post mold, House No. 2 post mold, House No. 1 or House No. 2 probable post mold remnant of central fire pit ash lens disturbance disturbance pothole] Beneath the pothole—which luckily terminated a foot or so below the floor of House No. 1—were the bottom portions of two post molds (Fig. 7). These were undoubtedly from the center posts used during construction of Houses No. 1 and 2. Although the exact circumstances could not be reconstructed because of disturbance, the center posts presumably were removed when the houses were completed and the hearths placed over the molds. In addition to the two center molds, there were two other post molds within the interior of the houses at Mound C. One was just east of the hearth area, the other was northwest of the hearth (Fig. 8). Both were exposed in the excavation floor at the level of House No. 1, and since they were not encountered above that level both probably relate to the earlier house.