Cob phytoliths were found common in this soil sample from Level 6/Pit D and is associated with the bulk charcoal sample from the same level which according to Perry et al. (2006:77) represented a subfloor deposit (See Table 1 and 2).
Perry, L., D. H. Sandweiss, D. R. Piperno, K. Rademaker, M. A. Malpass, A. Umire and P. de la Vera 2006 Early Maize Agriculture and Interzonal Interaction in Southern Peru. Nature 440:76-79.