The top of soil Zone IIb in the area surrounding the mound was, on an average, about 0.7 feet below the surface of the floodplain. The bottom of the mound structure, however, extended to an average depth of 1.4 feet below the floodplain surface where it terminated within Zone IIb (Fig. 3). Thus the surface of Zone IIb immediately beneath the mound formed a shallow, saucer-shaped depression which must have resulted from digging away of the topsoil before the mound was erected. This shallow pit (perhaps originally 1.0 to 1.5 feet deep) was approximately the same size and shape as the base of the mound. OCCUPATIONAL FEATURES Besides the mound itself, two occupational features were found in the Mound A area: (1) an area of burned soil within the mound fill (Feature No. 1), and (2) a sub-mound burial (Burial No. 1). Each is described separately below. _Feature No. 1_ This was an elongated area of heavily burned, sandy clay lying within the matrix of the mound fill (Fig. 3). Since the northern end of Feature No. 1 was not completely excavated, the exact dimensions were not determined; but the maximum length was evidently between 9 and 10 feet, while the maximum width was 4.3 feet. The long axis ran approximately north-south. Profiles revealed a lenticular cross section with a pronounced thickened area near the mid-point of the east edge. Near the center the burned zone was 0.5 feet thick; the thickened area near the east edge reached a maximum thickness of 1.5 feet. [Illustration: Fig. 3 HARROUN SITE—41UR10 PROFILE OF MOUND A (ALONG N20 LINE) dark gray, sandy mound fill Feature No. 1 Zone IIb sand, sub-mound Zone IIa sand HARROUN SITE 41UR10 PROFILE OF MOUND B (IDEALIZED SECTION THROUGH CENTER OF MOUND) floor of House No. 3 central hearth post molds stump disturbance humus gray, sandy mound fill whitish, sandy mound fill undisturbed sub-mound soil] The surface of Feature No. 1 was burned to a conspicuous degree of hardness and was sharply demarcated from the soft, unfired mound fill which overlay it. Beneath the central portion, heat had produced a thin zone of reddish sand which merged gradually with the underlying grayish sand of the mound fill.