Excavation area C5-6, Stratum VII (Powis et al. 2011, Table S3).
Powis, Terry G., Ann Cyphers, Nilesh W. Gaikwad, Louis Grivetti and Kong Cheong 2011 Cacao Use and the San Lorenzo Olmec. Proceedings of the National Academy of Sciences, USA 108(21):8595-8600.