​​3 ancient Maya cities discovered in Guatemala, 1 with an 'astronomical complex' likely used for predicting solstices

Archaeologists have discovered the remains of three Maya cities in the Petén jungle of Guatemala.

The cities are about 3 miles (5 kilometers) apart and are arranged like a triangle, Guatemala's Ministry of Culture and Sports reported in a translated statement. The cities were settled sometime during a period that archaeologists call the "middle preclassic," which occurred between roughly 1000 and 400 B.C. They were inhabited until around 1,100 years ago, when many Maya cities in the region collapsed.

The most important of the three cities is a site archaeologists are calling "Los Abuelos," which means "the grandparents." This name comes from two stone sculptures found at the site: one of a man and another of a woman. They are believed to depict ancestors of those who lived at the site, the statement said, noting that this city may have been a ceremonial center for those who lived in the area.

Los Abuelos thrived during the Middle Preclassic (1000 B.C. to 400 B.C.) and Late Preclassic periods (400 B.C. to A.D. 300) before being abandoned and then reinhabited during the Late Classic period (A.D. 600 to 900). It has an astronomical complex with buildings positioned in such a way that solstices and equinoxes can be recorded precisely, the statement said. The remains of a human burial were found at the site, along with the remains of two felines, pottery vessels, shells and arrowheads.

Archaeologists also discovered an altar in the shape of a frog and an engraved stone slab known as a stela. Once the Mayan writing on the stela is translated, it may provide more information about the site and the people who lived there.

Another newly found city, which archaeologists named "Petnal," has a 108-foot-tall (33 meters) pyramid, the statement said. The top of the pyramid is flat and has a room that houses the remains of murals on its walls. Red, white and black from the murals can still be seen, but more research is needed to determine what the murals depict.

Petnal was likely a political center, according to the statement. A frog-shaped altar was also found there. The frog is perceived as a symbol of fertility and rebirth in Maya mythology, wrote researchers Robert Sharer and Loa Traxler in their book "The Ancient Maya: Sixth Edition" (Stanford University Press, 2006). Frog altars have been found at other Maya sites and presumably would have been used in rituals.

The third newly found city, which the archaeologists dubbed "Cambrayal," has a network of canals that originates in a water reservoir at the top of a palace, the statement reported. The main purpose of the canals may have been for removing waste.

"It's especially exciting to learn about the Los Abuelos site," Megan O'Neil, an associate professor of art history at Emory University who was not part of the excavation team, told Live Science in an email. The stone sculptures found at the site "are especially poignant and are similar to many other examples of Maya people making offerings to vital sculptures and connecting with their ancestors by interacting with sculptures from the past."

O'Neil noted that it was important that archaeologists found the remains of intact ceramic vessels during their excavation. In the past, this region was heavily looted and the pottery made by the ancient Maya was taken and sold on the international market. The new finds may "help reconnect items in private and museum collections with their places of origin and deposition, helping return memory to those ceramics, to these sites, and to Maya people living in this region and across the world," O'Neil said.

The discoveries of the three cities, along with other newly found sites in the region, were made by a team of archaeologists from Slovakia and Guatemala who were part of the Uaxactún Archaeological Project (PARU), which searches for Maya ruins near the Maya city of Uaxactún. Since 2009, PARU has discovered 176 sites, although only 20 have been excavated. Live Science reached out to archaeologists involved with the research, but they did not answer questions by the time of publication.