One maize starch granule was recovered from sediment sample (FS1052, Sample 130). The date was taken from associated charcoal (Zarrillo et al. 2008).
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.