[Georgia State University archaeologist Christopher] Morehart said some of the skulls were found with finger bones inserted into the eye sockets. “It was common enough that it was intentionally placed there in the eye socket,” Morehart said, though the ritual significance of that remains unclear.
February 4, 2013
"Experts are puzzled by the unexpected find of such a large number of skulls at what appears to have been a small, unremarkable shrine...."
"The heads were carefully deposited in rows or in small mounds, mostly facing east toward the rising sun, sometime between 660 and 860 A.D., a period when the nearby city-state of Teotihuacan had already declined but the Aztec empire, founded in 1325, was still centuries in the future."