Explore, research, conserve.
What is PRASBX
The San Bartolo-Xultun Regional Archaeological Project (PRASBX) is a multi-institutional collaboration engaged in archaeology, art conservation, and environmental science initiatives in Guatemala. PRASBX investigates two nearby sites in the northeastern Petén region that had a long history spanning the rise and fall of Classic Maya kingdoms (ca. 400 BCE – CE 900). San Bartolo has the earliest evidence of Maya writing yet discovered dating to the 4th century BCE and Xultun was an important city led by a powerful dynasty during the 5th-9th centuries CE. Today, the large urban center and its network of smaller sites have been reclaimed by tropical forest, a protected ecological zone designated the Maya Biosphere Reserve.
A new discovery at Xultun
Video “Sak Tahn Waax,” copyright 2026, Proyecto Regional Arqueológico San Bartolo-Xultun. All rights reserved.
SBX Project members Franco Rossi, David Stuart, and Heather Hurst have published a new decipherment of a text from the Xultun mural chamber, 10K-2. This study identifies the name of a Maya astronomer-mathematician for the first time: Sak Tahn Waax (White-chested Fox). Text 19 presents an elegant formula relating several units of time, including the 260-day ritual day-count, the solar year, as well as cycles of Venus and Mars, and concludes with the attribution “so says Sak Tahn Waax.” This eighth-century scholar’s work builds upon a millennium of observational astronomy and the text recorded at Xultun expresses the intellectual virtuosity of Maya mathematics and calendrics from a period with no surviving codices. This 3-minute video summarizes the discovery; the full text is available at Antiquity.
Our ImpactThis Project is helping to protect and preserve these beautiful paintings, ensuring that future generations do not lose this knowledge and can see for themselves what our ancestors left us.
-M. J. T. from Sololá, Guatemala
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Although Xultun was known to archaeologists 100 years ago, very little research had been done at the site. In 2001, the discovery of murals at the previously undocumented site of San Bartolo initiated the first focused scientific investigations into the dynamic history of the region. We now know a great deal regarding regional occupation, periods of strength and prosperity, as well as stress. Xultun and nearby San Bartolo continue to reveal secrets and yield new discoveries about lifeways in Petén.
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Since the project’s inception, the SBX team has been a multi-disciplinary collaboration bringing together experts and students from Guatemala and the U.S. in the fields of archaeology, materials science and conservation, geography, art and art history, epigraphy, and environmental sciences. Over the duration of the project, we have built a close relationship with the experienced excavators, masons, and field personnel from the villages of Uaxactún, Dolores, and other communities in Petén, Guatemala – meet our team!
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We have an active program of research that spans archaeological initiatives, documentary projects, ethnographic collaborations, and ecologically driven investigations. In addition, each year we continue conservation monitoring of the murals and training future stewards to maintain their preservation. PRASBX shares its discoveries and insights through publications, lectures, and videos/media – explore these resources!
Want project swag? …and to help us make new discoveries?
We have so many questions we would like to research, new sites we want to explore, and artifacts we need to conserve - please consider adding your support to our project. Our goals include researching newly discovered features identified using lidar, going solar in camp, creating more films and educational materials, additional tools for monitoring wildlife, and increasing student opportunities in lab analysis. SBX Project has amazing swag - check out our donation page through this link!