is located in the northwest corner. The smallest of the three is along the east side of the settlement, near the Crawfish River (labeled "West Branch of Rock River" on the plates). The hill in the southeast corner is a natural gravel knoll, not built by the inhabitants. The largest mound was built in three stages, with a set of steps leading to the top, where a structure was built over the entire flat top. The mound was covered with a clay cap, probably to enhance its appearance. Corn was stored in pits inside the structure. Scholars have several theories about why the corn was kept there, and the overall purpose of the structure. It may have been the storage facility for the entire village, or storage for food just for the top village officials; it may have been used for ceremonies and rituals; or it could have been a house for the village officials. This topmost structure was rebuilt each time a larger stage of the mound was built on top of the old. The northwestern mound, used for formal burial, was also built in three stages. A special structure, approximately by , with its long axis towards the northeast–southwest, was built on the west side of the mound. Its doorway was in its southwest corner, and the structure was covered with a mixture of clay, willow branches, and grass. The floor was covered with a mat of what may have been cattails. The bodies of ten people were placed side by side on this, with their heads toward the doorway. The bones of another person were bundled together with cord and placed near them. Once this construction was complete, and the bodies were inside, the building was burned. The eastern mound had a large open-walled structure, about by , built on top of it, with firepits lined with white sand inside. The function of this mound and structure remain unclear. Additionally, to the northwest of the stockaded area, a row of round mounds extends northward. When archaeologists excavated in these mounds during the 1920s, they did not find the burial sites they had expected. Instead, each mound had a large post set in a pit in its center, surrounded by gravel and soil, with the pit capped with clay and gravel to hold the post steady. These mounds have been termed "marker mounds" because they may have been