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🇺🇸 United States · Rock art
Late Woodland – Fort Ancient (1000–1650 CE) · Fort Ancient (Late Woodland Mississippian)
Sandstone cliff-face bearing 37 Fort Ancient–culture petroglyphs (1000–1650 CE) incised on Mississippian Black Hand sandstone at edge of unglaciated Allegheny Plateau.
🇺🇸 United States · Earthwork
Middle Woodland Hopewell (c.100 BCE–250 CE) with Fort Ancient reuse · Hopewell → Fort Ancient
Outer-embankment timber circle 60 m diameter discovered 2007 by magnetometry inside Fort Ancient Hilltop Enclosure (Hopewell 100 BCE–500 CE, later Fort Ancient reuse).
🇺🇸 United States · Earthwork
Disputed: either Adena 320 BCE–200 CE or Fort Ancient 1070–1200 CE (latest C14 favors Fort Ancient 1120 CE) · Adena culture or Fort Ancient culture
Quarter-mile (411 m) effigy mound in shape of serpent with oval head swallowing an egg, 3 ft high, coiled tail atop meteor-crater plateau above Ohio Brush Creek, largest surviving effigy mound in…
