Archaeologists have uncovered the remains of more than 150 skulls from an ancient shrine in central Mexico—evidence of one of the largest mass sacrifices of humans in pre-Hispanic Mesoamerica. The skulls, many facing east, lay beneath a crude, slightly elevated mound of crushed stone on what was once an artificial island in a vast shallow lake, now completely dry.
"The site is barely a bump on the horizon in the middle of nowhere," said lead archaeologist Christopher Morehart, of Georgia State University. And that was baffling. Previous evidence of such sacrifices came from grand pyramids in large ceremonial centers. The site itself was probably not a battlefield, though. It was a sacred space that was specially prepared for rituals. The people who lived in this area appear to have performed elaborately choreographed rituals at the shrine before the fall of Teotihuacan, but they didn't include human sacrifice.
Because of its water-bound location and the presence of freshwater springs nearby, the shrine was likely the site of ceremonies that petitioned gods associated with rain and fertility. Artifacts uncovered include clay images of Tlaloc, a rain god.
The rituals began to include sacrifices, though, as power struggles gripped the parched region. Morehart and his colleagues from the National University of Mexico believe that victims were first killed and dismembered. The body parts may then have been thrown into the lake, while the heads were carefully arranged and buried. Incense was burned during this ceremony, along with the resinous wood of pine trees. Flowers added their own perfume to the fragrant smoke, and foods such as ritually burned maize were presented as additional offerings. Over the following centuries, new peoples arrived in the area and political power ebbed and shifted, yet the sacred nature of the site persisted.
Morehart and his team found evidence for rituals here during both the Aztec and colonial periods, and they even came across a recent offering. "As we were digging we found a black plastic bag. Inside was a hardboiled egg, a black candle, and some photos of people," he said. "It's a fascinating example of continued ritual activity in a place despite dramatic changes in social, political, and cultural contexts."