Near Collinsville in St. Clair County, Illinois — The American Midwest (Great Lakes)
The Twin Mounds
This large pair of mounds, known as the Twin Mounds, is probably a mortuary complex, although no excavations have been made into these mounds. We believe that a building on top of the flat-topped mound (# 60 or Fox Mound) may have served as a "charnel house," where bodies of important people were prepared for rial, and perhaps buried in the adjacent conical mound (#59 or Roundtop Mound).
Soil corings around them also suggest that these mounds were built up on a shared platform. The Twin Mounds are at the south end of the Grand Plaza, opposite Monks Mound.
Topics. This historical marker is listed in these topic lists: Anthropology & Archaeology • Cemeteries & Burial Sites • Indigenous Peoples and Communities.
Location. 38° 39.21′ N, 90° 3.826′ W. Marker is near Collinsville, Illinois, in St. Clair County. It can be reached from Ramey Street south of Collinsville Road, on the right when traveling south. Touch for map. Marker is at or near this postal address: 31 Park Dr, Collinsville IL 62234, United States of America. Touch for directions.
Regionally, this marker is in Greater St. Louis. It is also in the American Midwest, in the Lewis & Clark Corridor, in the Corn Belt, and in the Great River Road Region. Globally, it is in North America, the Western Hemisphere, the Western World, and the Anglosphere. Historically, it finds itself in what was once the Viceroyalty of New France, the territory of the Mississippian Culture, and the Northwest Territory.
Other nearby markers. At least 8 other markers are within walking distance of this marker: The South Stockade (about 300 feet away, measured in a direct line); West Stockade (about 700 feet away); Mound 72 (approx. 0.2 miles away); Grand Plaza
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Credits. This page was last revised on August 6, 2025. It was originally submitted on April 2, 2023, by Devry Becker Jones of Washington, District of Columbia. This page has been viewed 853 times since then and 125 times this year. Photos: 1, 2. submitted on April 2, 2023, by Devry Becker Jones of Washington, District of Columbia.
