Remote-sensing reveals details of ancient Olmec site in Mexico

Aerial remote-sensing of a large region of Mexico has revealed hundreds of ancient Mesoamerican ceremonial centers, including a large one at an important site for the ancient Olmec culture that is known for its colossal stone heads.

The remote-sensing method, called lidar, pinpointed 478 ceremonial centers in areas that were home to the ancient Olmec and Maya cultures dating to roughly 1100-400 BC, researchers said on Monday. The study was the largest such survey involving ancient Mesoamerica, covering all of the state of Tabasco, southern Veracruz, and bits of Chiapas, Campeche, and Oaxaca.

Lidar, short for Light Detection and Ranging, uses a pulsed laser and other data obtained while flying over a site to generate three-dimensional information about the shape of surface characteristics. It penetrates vegetation and pinpoints structures that otherwise might not be seen from the air or the ground.

A large ceremonial center was spotted at the early Olmec site called San Lorenzo, which is located in Veracruz in the lowlands near the Gulf of Mexico and was at its peak from roughly 1400-1000 BC. The Olmecs represented the oldest-known major Mesoamerican civilization and are thought to have influenced later cultures, including the Maya.

University of Arizona archaeologist Takeshi Inomata, who led the study published in the journal Nature Human Behaviour, said lidar spotted a large and previously unknown rectangular earthen ceremonial space at San Lorenzo.

It measures about 3,300 feet by 900 feet (1,000 meters by 275 meters), with 20 platforms around the edge slightly elevated above it. Its purpose remains unclear but it may have been a plaza where large numbers of people gathered for some type of ceremonies, while the platforms surrounding the plaza may have had residences, Inomata said.

The Olmec heads, each fashioned from a single basalt boulder, are among the most evocative pieces of art from ancient Mesoamerica. The naturalistic facial features are carved in such a way that experts suspect they are representations of actual ancient Olmec rulers.

Ten of the heads have been discovered at San Lorenzo. Inomata said there may be more of them undiscovered at related sites.

Many of the hundreds of ceremonial complexes identified in the study share common layouts like the one at San Lorenzo. Many appear to have been built with orientations aligned with the direction of sunrise on specific key ceremonial dates.

“These centers were probably the earliest material expressions of basic concepts of Mesoamerican calendars,” Inomata said, noting that such calendars were based on a unit of 20 days – matching the number of platforms around the San Lorenzo ceremonial center.

An even larger ceremonial center, described by Inomata and his colleagues last year, was found at a site in the Maya region called Aguada Fenix in Tabasco near the Guatemalan border. Dating to slightly later than the one at San Lorenzo, it and others found in the study suggest that Olmecs and other peoples in the region exchanged ideas.

Lidar has proven increasingly useful for archaeologists.


Receive the PVDN morning newsletter, exclusive content, and Whatsapp messaging for emergency alerts, by becoming a PVDN Supporter, learn more here, Or you can support local media with a one-time donation here


“The advantage of lidar is that it provides a three-dimensional, birds-eye view of the landscape and modifications to it made by humans – ancient and modern – in the form of building, transportation, agricultural and water control infrastructure,” said lidar engineer and study co-author Juan Carlos Fernandez-Diaz of the University of Houston’s National Center of Airborne Laser Mapping.

“Lidar also allows us to ‘see’ the landscape and infrastructure that in many parts of the world is hidden under forest cover,” Fernandez-Diaz added.

Trending Stories Right Now on PVDN

  • Puerto Vallarta airport reinforces health security on news of Omicron At least 2 positive cases of the new variant of the Ómicron coronavirus have already been confirmed in Brazil and more in Canada and several European Union countries. As a result, the International Health staff at the Puerto Vallarta International Airport and Puerto Vallarta redouble health security to detect individuals who may enter the city…
  • Huge crocodile captured in the Hotel Zone of Puerto Vallarta A crocodile measuring almost 3 meters long was captured and relocated from the hotel zone of Puerto Vallarta this Thursday morning. According to the Subdirectorate of Environment and Ecology, the reptile was located in the vicinity of the channel that flows into Playa Flamingos, in the northern hotel zone of the city. “In response to…
  • Mexico to reverse course, give COVID-19 booster shots Mexican officials have reversed their previous position against giving coronavirus booster shots and said Tuesday they are studying a plan to administer third doses to people over 60. The announcement came as Mexico nears 450,000 deaths from COVID-19. The country has fully vaccinated only about 50% of its 126 million people. President Andrés Manuel López…
  • Mexico says global response to new COVID-19 variant is “disproportionate” Mexico has not registered cases related to the omicron variant of the coronavirus, detected on November 22 in South Africa and considered especially worrisome by experts. This version of covid-19, which according to the first studies presents 30 mutations and a high capacity to evade both natural defenses and those related to vaccines, has set…
  • Mexicans hope for recovery of monarch butterflies Communal farmers and butterfly guides are hoping for a rebound in the number of monarch butterflies — and tourists — at their wintering grounds in central Mexico after a bad year for both last year. Experts say it is too early to calculate the number of monarchs, which migrate from the U.S. and Canada each…

Puerto Vallarta News

Compare Listings

Title Price Status Type Area Purpose Bedrooms Bathrooms