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| Mound Builders |
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Sepo people are a theoretical Mississippian culture of the late Woodland period around 1000 BCE, present in Mississippian culture pottery of the Dickson Mounds. [1] [2] Sepo occupations are confined to the Illinois River Valley between Anderson Lake in southern Fulton County, Illinois and Peoria Lake, including Sepo, Illinois an unincorporated community.[ citation needed ]