Pollen associated with sediment sample from Core PT9-65 at a depth of 65cm (Pohl et al. 1996:361).
Pohl, M. D., K. O. Pope, J. G. Jones, J. S. Jacob, D. R. Piperno, S. D. D. France, D. L. Lentz, J. A. Gifford, M. E. Danforth and J. K. Josserand 1996 Early agriculture in the Maya Lowlands. Latin American Antiquity 7(4):355-372.