The skull belonged to a man over 40 years old who lived during the Mesoamerican Classic period, between 400 and 900 AD, in what is now the Balcón de Montezuma archaeological zone in Tamaulipas. Physical anthropologist Jesús Ernesto Velasco González confirmed this represents the first proof that intentional cranial deformation was practiced at this urban center, located in the Sierra Madre Oriental mountains along Mexico's Gulf Coast.
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The discovery stems from INAH investigations of materials from the Balcón de Montezuma Archaeological Zone. (INAH)
Unprecedented Skull Modification Technique Reveals New Cultural Connections
The discovery emerged from recent laboratory studies conducted as part of the project "New Explorations in the Balcón de Montezuma Archaeological Zone," which INAH launched through its Tamaulipas center after a 30-year hiatus following initial investigations in the 1990s. Using contemporary perspectives and methodologies, researchers not only identified intentional cranial deformation for the first time at this type of site, but also discovered a variant never before reported in the region.
The skull exhibits what specialists call "tabular erect" deformation with a distinctive superior plane, creating what Velasco González describes as a parallelepiped or cube-like appearance.
"This form is tabular superior, named by some specialists given the polyhedral aspect it provokes in the cranium, where the compressive plane extends from the lambda over the occipital angle to the sagittal suture in the parietals," the anthropologist explained. "This causes the head to display a more square shape, unlike the conical form typical of other modifications."
Square-shaped skull discovered at Balcón de Montezuma archaeological site in Tamaulipas, Mexico, showing unique cranial modification technique. ( Technical Archive of the Physical Anthropology Section of CINAH Tamaulipas/INAH)
Cultural Significance and Geographic Origins Challenged
This tabular superior deformation has previously been documented at El Zapotal in Veracruz and recently in Maya areas, though the degree of modification differs. At El Zapotal, part of the Totonac region in central-southern Veracruz, the forehead flattening projects more height, while the Balcón specimen displays a lower profile. These variations initially suggested potential migration or cultural exchange between inhabitants of El Zapotal and northern Huasteca populations.
However, stable oxygen isotope analysis of collagen and bone bioapatite samples from a second individual's teeth and bones revealed surprising results. The technique, used to infer geographic origins of skeletal remains, indicated the person was born, lived, and died in this part of the Sierra Madre Oriental. "Therefore, the results discount a direct mobility relationship with groups from El Zapotal or further south," Velasco González noted.
Despite ruling out direct migration, researchers acknowledge the practice likely holds different cultural significance. This distinctive trait served for centuries as an indicator of various relationships between peoples inhabiting the pre-Columbian Gulf Coast, from the Yucatán Peninsula to Florida. The discovery suggests cultural transmission through networks rather than population movement.
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This is a Mesoamerican variant called upper tabular or parallelepiped. (Technical Archive of the Physical Anthropology Section of CINAH Tamaulipas/INAH)
Ancient Body Modification Practices Across Mesoamerica
Intentional cephalic modification represented a common bodily practice throughout Mesoamerica, with considerable diversity in forms. Classification derives from the profile observed in skeletal remains and the apparatus used to artificially deform the cranium during the first years of life. For tabular erect and oblique types, practitioners attached boards to the skull with bandages, caps, or cradles. The resulting cranial shapes would impact the person's appearance, accentuating the use of headdresses and adornments that distinguished individuals from others in their society.
Tonantzin Silva Cárdenas, director of the INAH Tamaulipas Center, emphasized the importance of resuming investigations that remained incomplete after the site's initial opening to the public. From 2010 onward, recovered materials have enabled more detailed analysis, expanding upon frameworks established by archaeologists Jesús Nárez Zamora and Araceli Rivera, the first researchers to investigate the location.
The physical anthropologist highlighted how these studies contribute new information to ratify and reorient hypotheses from the 1990s, documenting with fresh techniques and perspectives the bioarchaeology of the site. This research connects to the broader northern Huasteca mountain region, which shared not only historical-cultural links with Mesoamerican peoples from the Gulf Coast lowlands but also with groups from northern Mexico and even territories now comprising the southern United States. The findings illuminate complex cultural networks spanning vast distances, challenging previous assumptions about isolated development of ancient civilizations in this region.
Top image: Representative modified Maya skull with typical conical modification, exhibited at the Museo Nacional de Antropología e Historia, Mexico. Source: Maunus/CC BY-SA 3.0
By Gary Manners
References
INAH. 2025. Especialistas del INAH Revelan Práctica de Deformación Craneal Inédita en la Huasteca. Available at: https://www.inah.gob.mx/boletines/especialistas-del-inah-revelan-practica-de-deformacion-craneal-inedita-en-la-huasteca
