Pollen associated with AMS-dated wood sample in core 837 cm below datum (Pope et al. 2001:1372).
Pope, K. O., M. D. Pohl, J. G. Jones, D. L. Lentz, C. v. Nagy, F. J. Vega and I. R. Quitmeyer 2001 Origin and environmental setting of ancient agriculture in the lowlands of Mesoamerica. Science 292:1370-1373.