Millstone Bluff
Somebody hauled sandstone to the top of a bluff and walled off every side a person could climb, one of about ten of these in southern Illinois and not one of them shows evidence of a siege. Centuries later a village was built inside the wall, and its house floors are still legible as dents in the forest.
Field Guide Entry
Between roughly 600 and 900 CE, Late Woodland people carried sandstone up a bluff that stands more than 300 feet above the surrounding country and built a wall across every approach a person could climb. It is one of about ten so-called stone forts scattered across southern Illinois, and archaeologists have argued for a century about what they were for. Defense is the obvious answer and the evidence does not support it: none of the ten shows any sign of having been attacked.
The competing readings are ceremonial enclosure, seasonal aggregation site, and boundary marker. Nobody has settled it.
The village inside
Several centuries after the wall went up, Mississippian people built a village on the bluff top inside it, around 26 houses arranged around an open area. Their floors were dug slightly into the ground, and the depressions are still there. Walking the loop, the house outlines read as shallow rectangular dents in the leaf litter, which is unusual. Most Mississippian sites have been plowed flat, and what visitors normally see is a reconstruction. Here it is the actual ground plan.
Beside the houses is a cemetery of stone-box graves.
The rock
Near the summit a sandstone face carries a panel of petroglyphs: thunderbirds, a cross-in-circle, turkey tracks, axes, and a human figure. The cross-in-circle is a Mississippian motif that turns up across the Southeast, usually read as a cosmological symbol, though what it meant to the people who cut it here is not recoverable.
The site went onto the National Register on October 15, 1973. Visitors have chalked the petroglyph panel in the past to make it photograph better, which damages it, and the Forest Service asks that nobody touch or trace it.
Visiting Information
Free, open year round from dawn to dusk, with no staff on site. There is a gravel parking area and a vault toilet at the base, and the gravel access road is potholed.
The loop trail is about three quarters of a mile with roughly 190 feet of climb, wood-chipped, with interpretive signage at the wall, the house depressions, the cemetery, and the petroglyph panel. It is steep and rooty in places and takes most people about an hour.
Winter and early spring give much better sightlines, because bare trees make the wall line and the house depressions far easier to read. Ticks and copperheads are a genuine consideration in warm months. Removing or disturbing anything here is a federal offense under the Archaeological Resources Protection Act.
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