Conical mounds, typically associated with burials, are the most common and earliest Midwestern mound type, first appearing early in the Woodland Period around 500 B.C. to A.D. 1350. Several conical mounds at the park’s northwest corner, however, are not associated with burials; at least five were built over former locations of large-diameter posts that were likely placed to commemorate important events. The northernmost mound in this group, just north of the park behind a privately owned pioneer village and museum, did contain the burial of a young woman adorned with more than 17,000 shell beads. Although it is unclear how or whether she was related to the Mississippian town of Aztalan, she was clearly a person of high status. Additional mounds, including more conical mounds, an enclosure, and an elongated linear mound, lie along and below a prominent ridge on the east side of the Crawfish River.