About 37,000 years ago, occupants of a rock shelter at Abri Castanet in southwestern France etched the above figure into the shelter’s stone ceiling. The circular form is a furrow in the stone. The entering rod is in relief. Scientist have expressed uncertainty about what the etching represents. Such figures have been called vulvar representations. But that description is probably only half-correct.
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Reference: White, Randall, Romain Mensan, Raphaëlle Bourrillon, Catherine Cretin, Thomas F. G. Higham, Amy E. Clark, Matthew L. Sisk, Elise Tartar, Philippe Gardère, Paul Goldberg, Jacques Pelegrin, Hélène Valladas, Nadine Tisnérat-Laborde, Jacques de Sanoit, Dominique Chambellan, and Laurent Chiotti. 2012. “Context and dating of Aurignacian vulvar representations from Abri Castanet, France.” Proceedings of the National Academy of Sciences of the United States of America (PNAS), 2012 May 29; 109(22): 8450-5.