Unit 20, stratum 6b-18. husk uncharred
Grobman, Alexander, Duccio Bonavia, Tom D. Dillehay, Dolores R. Piperno, José Iriarte and Irene Holst 2011 Preceramic Maize from Paredones and Huaca Prieta, Peru. Proceedings of the National Academy of Sciences, U.S.A. 109(5):1755–1759.