Phytoliths from maize cobs associated with charcoal sample at a depth of 210-215cm from Mound Gamma Sector 1/D
Iriarte, J., I. Holst, O. Marozzi, C. Listopad, E. Alonso, A. Rinderknecht and J. Montaña 2004 Evidence for Cultivar Adoption and Emerging Complexity During the Mid-Holocene in the La Plata Basin. Nature 432:614-617.