Ancient Cacao DNA Discovered at Etowah Mounds

Researchers identified cacao residue in 11th-century pottery sherds at the Georgia archaeological site.

Updated on Oct. 2, 2026 in Botany

Weathered clay pottery fragments embedded in moist red soil and scattered leaves on a forest floor. — Researchers confirmed the discovery of Mesoamerican cacao DNA in 11th-century pottery shards found at the Etowah Indian Mounds, revealing long-distance trade networks. AI Illustration. Upload story photo >

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Genetic analysis published on August 26, 2026, revealed traces of cacao DNA in pottery sherds excavated from the Etowah Indian Mounds in Georgia. This finding suggests a trade connection between the U.S. Southeast and Mesoamerica approximately 1,000 years ago.

Why it matters

The presence of these organic compounds indicates that indigenous populations in Georgia maintained long-distance trade networks with Mesoamerican cultures. Researchers confirmed the residue was cacao rather than native yaupon holly to clarify the nature of regional ceremonial practices.

Researchers tested 31 pottery sherds found at the Etowah site, identifying four organic compounds associated with cacao, including caffeine. The cacao DNA exhibited degradation levels consistent with samples dating back to the 11th century.

The players

Etowah Indian Mounds

This historic site in Georgia preserves six earthen mounds built by Mississippian cultures between 1000 and 1550 C.E.

PLOS One

This is a peer-reviewed, open-access scientific journal that publishes primary research from various disciplines within science and medicine.

The details

The analysis focused on organic residue extracted from pottery recovered from a borrow pit originally excavated in the 1950s. By comparing the results against known contamination patterns, scientists confirmed the samples originated from Mesoamerican cacao rather than local flora.

1500 B.C.E.: Olmecs began producing fermented chocolate drinks.
1000 C.E. - 1550 C.E.: Mississippians constructed the earthen monuments at Etowah.
1050 C.E. - 1150 C.E.: Mississippians held feasts at the Etowah location.
11th century: Cacao residue arrived at the Etowah Indian Mounds.
August 26, 2026: The research team published their findings in PLOS One.

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The Big Picture

This discovery follows a pattern set by the Chaco Canyon cacao residue findings in New Mexico, which previously identified the long-distance trade of the crop. It shifts the paradigm of Mississippian archaeology by confirming expansive southern trade networks.

This research provides deeper insight into the historical diet and ritualistic behaviors of early indigenous populations in Georgia. These findings may eventually reshape how museums categorize and display artifacts retrieved from North American archaeological sites.

The takeaway

This discovery highlights the sophisticated nature of ancient indigenous trade networks that spanned across the continent. Future studies may use similar genetic testing methods to uncover hidden exchange patterns between other pre-colonial civilizations.