Historic cultural affiliation: unknown, probably Miami. Historic cultural affiliation: presumably Potawatomi or Sauk. Algonkian-talking tribe, probably either the Potawatomi or Sauk tribes. The Schwerdt site (20AE127) is positioned on the Kalamazoo River in Allegan County, Michigan. Almost all the pottery found at the site belonged to the late prehistoric Berrien Phase as described at the Moccasin Bluff site, a site on the St. Joseph River in Berrien County, Michigan about 70 miles (a hundred and ...