Circle petroglyph at the Wenkle site; scale is 20 cm.
The Wenkle site was cut into a horizontal sandstone shelf.
Diaz-Granados, Carol
1993 The Petroglyphs and Pictographs of Missouri: A Distributional, Stylistic, Contextual, Functional and Temporal Analysis of the State's Rock Graphics. Ph.D. Dissertation, Department of Anthropology, Washington University, St. Louis, Missouri.
Diaz-Granados, Carol and James R. Duncan
2000 The Petroglyphs and Pictographs of Missouri. University of Alabama Press, Tuscaloosa
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