Sleeping 4,000 Years on a Hidalgo Cliff

Mexico's National Institute of Anthropology and History (INAH) has officially confirmed 16 petroglyphs and cave paintings near the Tula River and La Requena Dam in the state of Hidalgo. The works span from prehistory to the Mesoamerican Postclassic period (AD 900–1521), with some estimated to be over 4,000 years old.

Why Now, Why Here

The discovery is directly linked to a planned 232km passenger railway between Mexico City and Querétaro. Construction began in April 2025, with progress currently at about 10%, yet significant heritage sites have already emerged along the route. Earlier this month, INAH revealed a 1,000-year-old Toltec altar at the nearby Tula Chico site. This latest rock art site is one of four active excavations along the corridor.

President Claudia Sheinbaum Pardo announced a route change in October 2025 to preserve the heritage site, accepting expert assessments that the paintings cannot be relocated to a museum.

What the Images Say

The figures found within the rock shelter are vivid and varied. Among them is a figure holding what appears to be a macana (a type of club), wearing a headdress and goggles reminiscent of Tláloc, the Aztec god of rain and fertility. Also identified are a stylised anthropomorphic figure rendered in red pigment and a form resembling a snake or lightning bolt. Paintings were made with mineral or vegetable pigments; petroglyphs were crafted using pointillism.

Near the Tula River, researchers found a deer representation and a figure with fangs, antennae, a breastplate, and bird-like legs — bearing resemblance to iconography of the Mogollon culture of the southwestern United States and northern Mexico. A figure with a human face and four legs resembling bird talons or horse hooves likely dates from the period of Spanish contact.

An INAH spokesperson stated: "The location of the artwork suggests a mythical-religious purpose, perhaps related to astronomical or calendrical phenomena."

From 'El Venado' in the 1970s to Official Recognition in 2025

The site was registered in the 1970s during the Tula Archaeological Project, when a painted deer element was discovered, earning it the name El Venado (The Deer). However, local communities had long known of the location before any official documentation, INAH noted.

Archaeologists believe the pre-Hispanic paintings are possibly related to the final stage of Tula, the great Toltec capital whose monumental remains continue to yield discoveries.

Outlook [Expert Analysis]

José-Miguel Perez Gomez, a specialist in Latin American rock art, called the discovery "a transformative milestone for Mexican archaeology and rock art studies." He noted that the site's "vast chronological span" — documenting human activity from over 4,000 years ago through the Postclassic and into the early colonial era — allows researchers to "analyse the transition of symbolic languages and artistic techniques within a single geographic context."

Gomez described the site as a "lithic archive of ritual life and environmental interaction," suggesting it could reshape understanding of cultural exchange between central Mexico and the northern Mogollon cultures.

With the railway rerouted, the site is likely to be preserved, but as excavation advances beyond the current 10% threshold, additional finds along the corridor remain a strong possibility.