Big Sioux Prehistoric Prairie Procurement System Archaeological District is a discontiguous historic district of 30 sites located along of river terraces and blufftops in Lyon County, Iowa. The sites are both large and small in size and they "contain a representative sample of the best preserved elements of a hunting and gathering system" of the native peoples who inhabited the northwest Iowa plains from 10,000 to 200 years ago. They include late base camps, deeply-buried early Archaic camps, and procurement sites from all time periods in the Pre-Columbian era. The district was listed on the National Register of Historic Places in 1989.
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