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Ramey-Incised decorated rim sherds (curvilinear designs perhaps symbolizing water or the water world?) reportedly from the Cahokia site.
Dick, G. C., 1955 Incised Pottery Decorations from Cahokia, A Middle Mississippi Site in Western Illinois. Missouri Archaeologist 17(4):36-48. Fig. 10, p. 43
Image courtesy of Missouri Archaeologist.