Offering Group: Plaque with Frontal and Profile Faces, 800-1200(?). This group is said to have been found together, the shells and greenstone plaque inside the translucent stone vessel. This report is lent credibility by the red pigment that unifies the group and also by a similar offering that was found in a pyramid ornamented with feathered serpents at Xochicalco, a site south of the Valley of Mexico. The offering's meaning is unknown.