Starch granules (3) recovered from charred organic residues on the inner surface of a cooking-pot sherd (FS1041, sample 6). The AMS date was on the charred residue which had, embedded within it, the starch granules (Zarrillo et al. 2008:5008).
Zarrillo, S., D. M. Pearsall, J. S. Raymond, M. A. Tisdale and D. J. Quon 2008 Directly dated starch residues document early formative maize (Zea mays L.) in tropical Ecuador. Proceedings of the National Academy of Sciences, USA 105(13):5006–5011.