Blair Mound is a historic archaeological site located near Winnsboro, Fairfield County, South Carolina. Blair Mound is an earthen mound structure in the form of a low, oval hummock. It measures approximately 75 by 50 yards (69 m × 46 m) and is just over 5 feet (1.5 m) high, with evidence of leveling for agricultural development.
The mound was constructed on the site of a late Woodland trash midden. It represents a late phase of the widespread Mississippian culture Pattern, and appears to have been constructed by A.D. 1300–1400.
It was added to the National Register of Historic Places in 1974.
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