In the North central Middle West there is a well-defined complex of archaeological material traits that received the classificatory name Oneota aspect of the Upper Mississippi phase at the Indianapolis meeting of 1935. The material which probably should be grouped together occurs over quite a large geographical area. In northern Illinois it is one of the best known of the prehistoric cultures and is represented by at least three foci. In Wisconsin the southern and western parts of the state contain quite a number of sites grouped into three foci, two of which appear to be local, namely, Lake Winnebago and Grand River. The sites in northeastern Iowa and southeastern Minnesota contain remains so similar to those of southwestern Wisconsin that they have been placed together in the Orr focus.