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Line drawing of engraved beaker with cross-and-circle motif recovered from near winter solstice pole of Circle 2, Cahokia Tract 15A.
Wittry W.L. 1996. Discovering and Interpreting the Cahokia woodhenges. In The Ancient Skies and Sky Watchers of Cahokia: woodhenges, Eclipses, and Cahokian Cosmology. Wisconsin Archaeologist. 77(3/4):26-35. Fig. 3.2, p. 31
Image courtesy of The Wisconsin Archaeologist.