The known pottery wares of the central Great Plains fall into two main groups on the basis of the techniques employed in finishing vessel surfaces. These are (a) the paddle-marked wares, in which vessel exteriors bear impressions from a carved or wrapped instrument ; and (6) the smoothed, polished, or slipped wares, which may or may not carry incised or trailed body ornamentation. Occasional smoothed or imperfectly polished sherds and vessels are likely to occur at almost any site where extended excavations are carried on. As the prevalent and characteristic type, however, pottery without paddle impressions is found principally along the Missouri River and in the lower drainages of its westerly tributaries. Several archeological horizons are concerned. They include the predominantly shell-tempered protohistoric Oneota and Oneotalike remains of eastern Nebraska and northeastern Kansas (Hill and Wedel, 1936) ; the grit-tempered prehistoric Nebraska Aspect materials, confined mostly to a narrow strip along the Missouri River bluffs (Strong, 1935, pp. 251-252; Bell and Gilmore, 1936, pp. 319, 326; Hill and Cooper, 1938) ; and the prehistoric shelltempered wares with apparent Middle Mississippi affinities occurring in northwestern Missouri (Wedel, 1939) and in some of the Nebraska Aspect sites northward to the mouth of the Platte River near Omaha (Strong, 1935, p. 255). Plain ware also appears to constitute a considerable proportion of the pottery from protohistoric Dismal River sites in western Nebraska and Kansas (Hill and Metcalf, 1942, p. 181).
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