"A large boulder ca. 4 m (12 feet) long and 2 m (6 feet) high sculpted entirely over its upper surface to represent a grotesque two-headed monster. The overall form of this carving like other "zoomorphs" at Quirigua, represents a fundamental Maya cosmological concept embodied in a bicephalic reptilian (crocodilian) monster."
Robert J. Sharer, Quirigua: A Classic Maya Center & Its Sculptures, Carolina Academic Press, 1990, p. 28-9
NOTE: The dedicatory date recorded on this monument is 18.104.22.168.0 12 Ahau 8 Pax (780 A.D.).