“You had to hold your breath and dive a little to get through.” That’s how speleologist Katiya Pavlova summarized the experience of crawling through a six-inch-high, water-filled cleft in the isolated Tlayócoc cave a route probably not traversed by human beings in half a millennium. The cave, which sits at 7,800 feet in the harsh mountains of Guerrero, Mexico, is not one for the weak of heart. The hike alone entails navigating through steep, snake-filled slopes and the possibility of pumas, only to slide down into a realm of blackness and water, where air thickens and the ceiling closes in.
But it was in this intimidating landscape that Pavlova and Beltrán stumbled upon a discovery that would galvanize the world of archaeology: 14 artifacts, neatly placed around stalagmites, undisturbed since the Postclassic period. What they initially had mistaken for recent trash proved to be the remains of fertility ceremonies conducted by the mysterious Tlacotepehua people, whose past has been mostly forgotten.
The Tlayócoc cave “Badger Cave” in Nahuatl has been a local legend for centuries as a place with water and bat guano, but a much deeper history lay hidden under geology and centuries of silence. The expeditionaries’ path led them about 150 meters into the cave where the ceiling was so low that the water was barely more than a knife’s breadth from rock. It was here, when stopping to rest and get their breath, that they saw the first shell bracelet, draped over a conical stalagmite like a ring on a finger. “It was very exciting and incredible!” Pavlova later recalled. “We were lucky here.”
Mexican National Institute of Anthropology and History (INAH) archaeologists soon arrived on the site, carefully excavating the hoard in March 2025. The finds consisted of four shell bracelets, a colossal decorated snail shell (genus Strombus), two intact stone disks and six broken disk pieces, and a fragment of carbonized wood. The bracelets, potentially made from the sea snail Triplofusus giganteus, were not only stunning but also rich in imagery. Three of the bore bore incised ornamentation: the S-form “xonecuilli” symbol, which is linked to Venus and time, and the profile of a human figure, probably the creator god Quetzalcoatl.
The position of these objects was not random. The bracelets had been draped over stalagmites, which had been carefully molded into round shapes, which hinted at phallic undertones and an intentional ritual environment. “For pre-Hispanic cultures, caves were sacred places associated with the underworld and considered the womb of the Earth,” said INAH archaeologist Miguel Pérez Negrete. In Mesoamerican cosmology, such caves as Tlayócoc were regarded as entrances to Mictlan, the underworld, and as the very origin of life and fertility. The mythical Quetzalcoatl, for instance, was said to have gone down into the underworld to bring back the bones and corn from which man was formed.
\The geological background of the find is as interesting as the artifacts themselves. Tlayócoc is a typical karst cave created by the dissolution of limestone over thousands of years. The region’s geology produces a stable, humid cave microclimate, which has been instrumental in the preservation of organic matter. Pérez explained, as cited, “It’s very likely that, because they were found in a close environment where humidity is fairly stable, the objects were able to survive for so many centuries.” This stability has helped to maintain not just the shell and stone but also the fragile carbonized wood, a very uncommon discovery in Mesoamerican archaeology.
The existence of the carbonized wood provides a window into the scientific techniques employed to date such finds. Radiocarbon dating, quantifying the breakdown of carbon-14 isotopes in organic matter, enables researchers to determine a chronology for when these rituals occurred. The artifacts have been securely dated back to the Postclassic era, 950 to 1521 CE, corresponding to the period when the Tlacotepehua culture thrived in these mountains.
The iconography incised onto the bracelets and shells is just as enlightening. The “xonecuilli” symbol, or “crooked foot” in Nahuatl, is associated with the planet Venus a calendric and ritual focus of Mesoamerican astronomy. The profile faces and zigzag symbols can be linked to cosmogonic myths concerning creation and fertility cycles, highlighting Tlacotepehua society’s extensive amalgamation of astronomy, myth, and ritual practice.
The discovery at Tlayócoc is not only a testament to the perseverance and skill of modern explorers but also a rare glimpse into the ritual life of a people about whom so little is known. As archaeologists continue to analyze the finds, the cave’s stable environment and the artifacts’ careful arrangement promise to yield further insights into the sacred landscapes and cosmologies of ancient Mesoamerica.
