Category Archives: NORTH AMERICA

Mammoth Site of Hot Springs in South Dakota is the World’s Largest Columbian Mammoth Exhibit

Inside the excavation of a South Dakota sinkhole that swallowed more than 60 mammoths

When I learned of this and ongoing mammoth fossil excavations, I thought that this was fake But when I was inside the building and I saw that real work was taking place, I was delighted to see the history of the building opened in front of your eyes.

The Mammoth Site is a ‘ successful paleontological mining site with the highest concentration of mammal remains worldwide! ‘ According to the website. “The mammoth count is currently 61, with 58 Colombian mammoths and 3 Woolly mammoths found.

Just 140,000 years later, in 1974, when a worker preparing the field for a housing project hit a tusk with the blade of his machine. 

A volunteer crew at work.
A mounted replica of one of the site’s mammoths.

The Mammoth Site has been an active dig ever since, one of the few places in the U.S. where you can follow a fossil’s path from the ground to the preparation lab to the museum floor, all within the same building.

Excavating the Ice Age

Turning into the parking lot, I’m greeted by a life-size reconstruction of one of the site’s namesakes, a Columbian mammoth, raising its trunk above the museum’s welcome sign. The town of Hot Springs has fully embraced the local extinct wildlife.

The restaurant next to the museum is named Woolly’s, in honor of the smaller species of mammoth found next door, and there are a surprisingly large number of visitors on the site’s morning tours for a day in late September.

As I enter the room that houses the dig itself, I’m struck by the height of the excavation. It takes a pretty big hole in the ground to trap upwards of 60 mammoths (mostly the larger Columbian species, though they’ve found a couple of woolly mammoths, too), but hearing about it and seeing it in person are two different things.

The way the bones have been excavated has left dramatic sheer walls and flat terraces in the yellowish-tan earth, on which light brown mammoth skulls sporting huge tusks sit like statues on pedestals. The bones are jumbled together and piled high—nothing like that perfectly articulated skeleton in Jurassic Park.

Descending the stairs from the main wooden walkway that encircles the active parts of the dig to stand on a fenced-in platform on the level of one of the deepest floors, I’m keenly aware that there are likely many more bones of Ice Age animals beneath my feet. Along with the famous mammoths, many other species have been found here, including llamas, camels, and the giant short-faced bear (Arctodus simus).

The site’s geologists have figured out that the sinkhole was originally about 65 feet deep. The dedicated crew of paleontologists, interns, and volunteers working at the site have only excavated about 20 feet of that. And, unlike the Jurassic Park paleontologists, they’re not doing it with just paintbrushes and bare hands.

A prehistoric puzzle

On the day of my visit, a group of adult volunteers sits in the less-excavated half of the bonebed, gently tapping away with hammers and small chisels, scraping with trowels, and scooping the loose sediment into buckets.

One of the least glamorous parts of a thorough excavation is screen-washing, where bucket after bucket of dirt is rinsed through a screen until only small bits of rock, bone, and teeth are left behind. What remains is then picked through for tiny fossils of small mammals—rodents and rabbits—that also met their end in the sinkhole.

A jumbled pile of mammoth bones, including vertebrae, limbs, and ribs.

Some of this picking happens downstairs, in the Mammoth Site’s fossil preparation lab. A short elevator ride down to the museum’s lower floor reveals the part of paleontology most people don’t think about when they see a beautifully complete mounted skeleton in a museum.

After leaving the elevator, I’m greeted by a wall of windows. Here, visitors can peer into the lab as bits of bone are painstakingly cleaned and glued back together, like putting together a puzzle where half of the pieces are broken or missing.

A wall-mounted TV plays a video of the site’s molding and casting process. Silicone rubber is used to make an exact mold of a fossil. That mold can then be used to create replicas (called casts) of the bone, which are often what ends up mounted in museums. Fossils are fragile and irreplaceable, so it’s safer to work with the casts.

The people who work in these spaces are the unsung heroes of paleontology, painstakingly bringing ancient bones back to life. While a lot of museums are starting to pull back the curtain on what it takes to prepare a fossil when it comes in from the field by building these kinds of “fishbowl” lab spaces, the Mammoth Site is a rare destination because the fossils are being both excavated and pieced back together inside the same building.

A diagram shows the size of the mammoths.
Carefully excavated mammoth skulls.

Heading back upstairs, I see the work of the site’s preparators in the museum’s more traditional gallery space, where mounted mammoths and replicas of huts made of casts of mammoth bones and faux-fur await.

Half of this space is dedicated to ancient life in the Black Hills and surrounding areas, but the other half is all about fossil elephants and their relatives. Bits of mummified tissue from mammoths found in the Siberian permafrost fill the cases on one wall. Mounted skeletons include a Channel Islands pygmy mammoth, a dwarf descendent of mainland Columbian mammoths.

The Mammoth Site is a local treasure of international scientific importance, and I leave with a certain amount of envy that the residents of Hot Springs get to live with these fossil riches so close at hand. But I’m also reminded that the traces of prehistoric life are everywhere—even if they’re usually less dramatic than a sinkhole full of mammoths.

Ancient Maya kingdom unearthed in a backyard in Mexico

Ancient Maya kingdom unearthed in a backyard in Mexico

A team of archeologists from the backyard of a rancher in Mexico have discovered the site of a long-lost ancient Mayan empire. The town was discovered with the help of a food vendor.

Since 1994, when references to it were discovered at inscriptions on other Mayan excavation sites, scientists have been searching for signs of the ancient Mayan kingdom of Sak Tz’i ‘. Apart from the reference, the kingdom is also mentioned in other sculptures.

It so happens that, in 2014, the University of Pennsylvania graduate student Whittaker Schroder was driving around Chiapas in southeastern Mexico when a man selling carnitas on the side of the highway informed him that a friend, a cattle rancher, had found an ancient stone tablet.

Upon confirming the authenticity of the tablet, Schroder and another graduate student from Harvard, Jeffrey Dobereiner, informed anthropology professor Charles Golden and Brown University bioarchaeologist Andrew Scherer of the find.

From that time, it took years before the team received permission to excavate on the property, with the team making sure that the government would not confiscate the rancher’s land.

This is because, in Mexico, cultural heritage such as Maya sites are considered the property of the state. So, the team worked with government officials to make sure that the rancher would get to keep his land.

The research team believes that the archaeological site unearthed in the rancher’s backyard, Lacanja Tzeltal, is actually the capital of the Sak Tz’i’ kingdom that was first settled in by 750 B.C.

At the site, the team found evidence of a marketplace where goods were sold, a 45-foot pyramid, as well as the ruins of several structures that likely served as the residence of the elites.

The team also found evidence of a ball court and a royal palace, as well as Maya monuments with important inscriptions. Dozens of sculptures were also recovered from the site, although most of them were already degraded. Ultimately, the best-preserved artifact from the site remains to be the tablet from the rancher.

Being a relatively modest kingdom compared to the others, Sak Tz’i’ was surrounded on all sides by more powerful states. This is evidenced by the walls that were possibly built to keep invaders out.

According to Golden, it is possible that mid-sized Sak Tz’i’ kingdom’s survival among the more powerful kingdoms depended not just on its military strength but also on making peace with its neighbors.

That said, little is still known about how the kingdom survived amid the hostilities they likely faced from other, more powerful kingdoms.

For now, the team is planning to go back to the site in June to stabilize the buildings that are in danger of collapsing well as to map the ancient city with modern tools and to look for more artifacts.

Left, drawing of a tablet found at the site. Right, a digital 3D model.
Left, drawing of a tablet found at the site. Right, a digital 3D model.

The study describing the find is published in the Journal of Field Archaeology. 

Mao of the Sak Tz’i’ kingdom excavation site in Mexico. The horseshoe-shaped building on the left is the palace area.

Humans were in America 100,000 years earlier than we thought, study claims

Humans were in America 100,000 years earlier than we thought, study claims

The remnants of a mastodon found in a routine freeway excavation in San Diego shows there was human activity in North America 130,000 years ago — or about 115,000 years earlier than previously thought.

Broken bone fragments show evidence that humans were around much earlier than previously thought.

The fossils of the ancient mammal were revealed more than 20 years ago by paleontologists with the San Diego Natural History Museum. But it wasn’t until now that scientists were able to accurately date the findings, and possibly rewrite the history of the New World as we know it.

“This is a whole new ball game,” Steve Holen, co-director of the Center for American Paleolithic Research and the paper’s lead author, told CNN. The discovery changes the understanding of when humans reached North America.

The study, to be published this week in the science journal Nature, said the numerous limb bones fragments of a young male mastodon found at the site show spiral fractures, indicating they were broken while fresh.

Hammerstones and stone anvils were also found at the site, showing that humans had the manual skill and knowledge to use stone tools to extract the animal’s marrow and possibly to use its bones to make tools.

The discovery took place in 1992 by museum paleontologists, who were doing routine work at a freeway expansion in San Diego County. The site was named Cerutti Mastodon site, in honor of Richard Cerutti, who made the discovery and led the excavation.

Museum paleontologist Tom Deméré, who was involved in the excavation and has also been part of this study, said the project took five months and covered almost 600 square feet. He described the decades-long project as an “incredible odyssey.”

Researchers work at the Cerutti Mastodon site near San Diego.

“We early on realized that this is a special site,” said Deméré, adding later the group was “salvaging fossils as they were being found.”

Five large stones, which were used to break the bones and teeth of the mastodon, were found alongside the animal’s remains, according to the study. The site also contained fossils of other extinct animals, including dire wolf, horse, camel, mammoth and ground sloth.

Scientists specialized in various fields, from archaeology to the environment, have done research at the Cerutti site since its discovery.

Advanced radiometric dating technology allowed scientists to determine the mastodon bones belong to the Late Pleistocene period, or 130,000 years old, with a margin of error of plus or minus 9,400 years.

Some of the Mastodon bones found at the excavation site are seen in an image

“The bones and several teeth show clear signs of having been deliberately broken by humans with manual dexterity and experiential knowledge,” Holen said in a press release.

Experts agreed that the earliest records of human ancestors in North America is about 15,000 years old, but the discovery of the Cerutti site “shows that human ancestors were in the New World ten times that length of time,” said paleontologist Lawrence Vescera.

“This site really nails it because the evidence is really clear.”

The 11 scientists involved in the study told CNN it’s too early to tell the impact of the new findings. For now, they want the general audience to see it and understand it, and for their peers to study it — and even challenge it.

The archaeological treasures found at the Cerutti site will be on display at the San Diego museum. And a partnership with the University of Michigan will allow for even more people to see 3-D models of some of the specimens at their Online Repository of Fossils.

Mexico Returns Bronze Sculpture To Nigeria

Mexican Government Returns Stolen Bronze Sculpture to Nigeria

Mexican customs officials thwarted an attempt to smuggle the ancient Yoruba sculpture into the country.

Mexico returns a smuggled bronze sculpture to Nigeria ?? after it was seized by customs officials at an airport. The Yoruba artefact is believed to date back to the 6th Century.

The Mexican government has recently returned a stolen bronze sculpture to Nigeria according to Vanguard.

The ancient sculpture was seized by customs officials at Mexico City Airport following an attempt to reportedly smuggle the artefact into the country.

The bronze sculpture itself is thought to be a 6th-century relic from the southwestern Yoruba City of Ife and depicts a man in woven pants sitting cross-legged and holding an instrument.

While it is still unclear how the artefact was obtained in the first place, Mexico’s Deputy Secretary of Foreign Affairs Julián Ventura Valero says, “We oppose the illegal commercialisation of archaeological pieces, an important cause of the impoverishment of the cultural heritage of the nations of origin, since it undermines the integrity of cultures and, therefore, of humanity.”

Several bronze artefacts ranging from a 19th-century cockerel from Benin City to an 18th-century Ethiopian crown have since been returned to their respective countries over the past few years.

Often the result of looting during the colonial era, the governments of these African countries are now rightly demanding that these stolen pieces of significant cultural history be permanently returned to them and not offered on “long-term loans” as has often been the case.

However, thousands more of these invaluable artefacts from many African countries remain housed in museums across Europe. Revisit our interview with anthropologist and curator Niama Safia Sandy about the politics around the repatriation of African art here.

Modern technology reveals old secrets about the great, white Maya road

Modern technology reveals old secrets about the great, white Maya road

Would one of the greatest cities of the ancient Mayan world, the mighty Queen of Cobá, create the longest Mayan road to invade a smaller, isolated neighbor and gain a foothold against the emerging Chichén Itzá empire?

Traci Ardren, a sociology professor at the University of Miami, has been fascinated by the problem for some time now. Now, she and fellow scholars may be a step closer to an answer, after conducting the first lidar study of the 100-kilometer stone highway that connected the ancient cities of Cobá and Yaxuná on the Yucatan Peninsula 13

Once used mainly by meteorologists to study clouds, lidar—short for “light detection and ranging”—technology is revolutionizing archaeology by enabling archaeologists to detect, measure, and map structures are hidden beneath dense vegetation that, in some cases, have grown for centuries, engulfing entire cities.

This lidar map of downtown Yaxuna reveals many ancient houses, platforms, palaces, and pyramids that are hidden by vegetation.

Often deployed from low-flying aircraft, lidar instruments fire rapid pulses of laser light at a surface and then measure the amount of time it takes for each pulse to bounce back. The differences in the times and wavelengths of the bounce are then used to create digital 3-D maps of hidden surface structures.

The lidar study, which Ardren and fellow researchers with the Proyecto de Interaccion del Centro de Yucatan (PIPCY) conducted in 2014 and 2017 of Sacbe 1—or White Road 1, as the white plaster-coated thoroughfare was called—may shed light on the intentions of Lady K’awiil Ajaw, the warrior queen who Ardren believes commissioned its construction at the turn of the 7th century.

In an analysis of the lidar study, recently published in the Journal of Archaeological Science, the researchers identified more than 8,000 tree-shrouded structures of varying sizes along the sacbe—with enough total volume to fill approximately 2,900 Olympic swimming pools.

The study also confirmed that the road, which measures about 26 feet across, is not a straight line, as has been assumed since Carnegie Institute of Washington archaeologists mapped its entire length in the 1930s, with little more than a measuring tape and a compass.

Rather, the elevated road veered to incorporate preexisting towns and cities between Cobá, which known for its carved monuments depicting bellicose rulers standing over bound captives, controlled the eastern Yucatan, and Yaxuná—a smaller, older, city in the middle of the peninsula. Yet, the isolated Yaxuná (pronounced Ya-shoo-na) still managed to build a pyramid nearly three times bigger and centuries before Chichén Itzá’s more famous Castillo, about 15 miles away.

A drawing of a carving found on a stone monument in Cobá depicts the warrior queen who may have built the great, white road to expand her domain.

“The lidar really allowed us to understand the road in much greater detail. It helped us identify many new towns and cities along the road—new to us, but preexisting the road,” Ardren said. “We also now know the road is not straight, which suggests that it was built to incorporate these preexisting settlements, and that has interesting geopolitical implications. This road was not just connecting Cobá and Yaxuná; it connected thousands of people who lived in the intermediary region.”

It was partly Yaxuná’s proximity to Chichén Itzá, Mexico’s most famous Maya ruin which flourished after Yaxuná and Cobá waned, that led Ardren and other PIPCY researchers to theorize that K’awiil Ajaw built the road to invade Yaxuná and gain a foothold in the middle of the peninsula. Coba’s ruler for several decades beginning in 640 A.D., she is depicted in stone carvings trampling over her bound captives.

“I personally think the rise of Chichén Itzá and its allies motivated the road,” Ardren said. “It was built just before 700, at the end of the Classic Period, when Cobá is making a big push to expand. It’s trying to hold on to its power, so with the rise of Chichén Itzá, it needed a stronghold in the center of the peninsula.

The road is one of the last-gasp efforts of Cobá to maintain its power. And we believe it may have been one of the accomplishments of K’awiil Ajaw, who is documented as having conducted wars of territorial expansion.”

To test their theory, Ardren, an expert on gender in ancient Maya society who edited the 2002 book “Ancient Maya Women,” and fellow PIPCY scholars received funding from the National Science Foundation to excavate ancient household clusters along the great white road.

Their goal is to determine the degree of similarities between the household goods in Cobá and Yaxuná before and after the road was built. The thinking, Ardren said, is that after the road linking the two cities, the goods found in Yaxuná would show increasing similarities to Cobá’s.

So far, the researchers have excavated household clusters on the edge of both Cobá and Yaxuná, and they plan to begin the third dig this summer, at a spot informed by the lidar study. It sits between the two ancient Maya cities, on the great, white road that Ardren says would have glowed brightly even in the dark of night.

As she noted, the road was as much an engineering marvel as the monumental pyramids the Maya erected across southern Mexico, Guatemala, northern Belize, and western Honduras.

Although built over undulating terrain, the road was flat, with the uneven ground filled in with huge limestone boulders, and the surface coated with bright, white plaster. Essentially the same formula the Romans used for concrete in the third century B.C., the plaster was made by burning limestone and adding lime and water to the mixture.

“It would have been a beacon through the dense green of cornfields and fruit trees,” Ardren said. “All the jungle we see today wasn’t there in the past because the Maya cleared these areas. They needed wood to build their homes. And now that we know the area was densely occupied, we know they needed a lot of wood. Because they also needed it to burn limestone”—and build the longest road in the Maya world 13 centuries ago.

Mexico earthquake reveals lost ancient temple inside the pyramid

Mexico earthquake reveals lost ancient temple inside the pyramid

The remains of the great pyramid of Teopanzolco have long offered visitors to the southern Mexican site unique insights into the structure’s inner workings while simultaneously conjuring visions of the intricate temples that once arose from its series of bases and platforms.

Today, remnants of twin temples—to the north, a blue one dedicated to the Aztec rain god Tláloc, and to the south, a red one dedicated to the Aztec sun god Huitzilopochtli—still top the pyramid’s central platform, joined by parallel staircases.

Although archaeologists have intermittently excavated the Teopanzolco site since 1921, it took a deadly 7.1 magnitude earthquake to unveil one of the pyramid’s oldest secrets: an ancient shrine buried about six-and-a-half feet below Tláloc’s main temple.

According to BBC News, scientists from Mexico’s National Institute of Anthropology and History (INAH) discovered the temple while scanning the pyramid for structural issues.

The earthquake, which struck central Mexico on September 19, 2017, caused “considerable rearrangement of the core of [the pyramid’s] structure,” INAH archaeologist Bárbara Konieczna said in a statement.

For local news outlet El Sol de Cuernavaca, Susana Paredes reports that some of the most serious damage occurred in the upper part of the pyramid, where the twin temples are located; the floors of both structures had sunk and bent, leaving them dangerously destabilized.

The discovery was made at the Teopanzolco pyramid in Cuernavaca

To begin recovery efforts, archaeologists created wells in the temple dedicated to Tláloc and a corridor separating the two temples.

During this work, the team unearthed a previously unknown structure, which featured a similar architectural style—double facade walls covered in elongated stones and stucco-encased slabs—to that of the existing Tláloc temple.

In the statement, Konieczna notes that the temple would have measured about 20 feet by 13 feet and was probably dedicated to Tláloc, just like the one located above it. It’s possible that a matching temple dedicated to Huitzilopochtli lies on the opposite side of the newly located one, buried by later civilizations’ architectural projects.

The humidity of the Morelos region had damaged the temple’s stucco walls, according to a press release, but archaeologists were able to save some of the remaining fragments.

Below the shrine’s stuccoed floors, they found a base of tezontle, a reddish volcanic rock widely used in Mexican construction, and a thin layer of charcoal. Within the structure, archaeologists also discovered shards of ceramic and an incense burner.

Paredes of El Sol de Cuernavaca notes that the temple likely dates to about 1150 to 1200 C.E. Comparatively, the main structure of the pyramid dates to between 1200 and 1521, indicating that later populations built over the older structures.

The Teopanzolco site originated with the Tlahuica civilization, which founded the city of Cuauhnahuac (today is known as Cuernavaca) around 1200, as G. William Hood chronicles for Viva Cuernavaca. During the 15th century, the Tlahuica people were conquered by the Aztecs, who, in turn, took over the construction of the Teopanzolco pyramids.

Following the 16th-century arrival of the Spanish conquistadors, the project was abandoned, leaving the site untouched until its 1910 rediscovery by Emiliano Zapata’s revolutionary forces.

9,900-year-old Mexican female skeleton distinct from other early Native American settlers

9,900-year-old Mexican female skeleton distinct from other early Native American settlers

According to a research published at PLOS ONE on the 5th February 2020 by Wolfgang Stinnesbeck of the University of Heidelberg, the new skeleton discovered in the submerged caves of Tulum sheds light on the earliest settlers in Mexico.

9,900-year-old Mexican female skeleton distinct from other early Native American settlers
Underwater exploration of Chan Hol Cave, near Tulum, Mexico. Credit: Eugenio Acevez.

Humans have been living in Mexico’s Yucatán Peninsula since at least the Late Pleistocene (126,000-11,700 years ago).

We also discovered much of the earliest Mexican settlers from nine well-preserved human skeletons found in the submerged caves and sinkholes near Tulum in Quintana Roo, Mexico.

Here, Stinnesbeck and colleagues describe a new, 30 percent-complete skeleton, ‘Chan Hol 3’, found in the Chan Hol underwater cave within the Tulum cave system.

The authors used a non-damaging dating method and took craniometric measurements, then compared her skull to 452 skulls from across North, Central, and South America as well as other skulls found in the Tulum caves.

The analysis showed Chan Hol 3 was likely a woman, approximately 30 years old at her time of death, and lived at least 9,900 years ago.

Her skull falls into a mesocephalic pattern (neither especially broad or narrow, with broad cheekbones and a flat forehead), like the three other skulls from the Tulum caves used for comparison; all Tulum cave skulls also had tooth caries, potentially indicating a higher-sugar diet.

This contrasts with most of the other known American crania in a similar age range, which tend to be long and narrow, and show worn teeth (suggesting hard foods in their diet) without cavities.

Though limited by the relative lack of archeological evidence for early settlers across the Americas, the authors suggest that these cranial patterns suggest the presence of at least two morphologically different human groups living separately in Mexico during this shift from the Pleistocene to the Holocene (our current epoch).

The authors add: “The Tulúm skeletons indicate that either more than one group of people reached the American continent first, or that there was enough time for a small group of early settlers who lived isolated on the Yucatán peninsula to develop a different skull morphology.

The early settlement history of America thus seems to be more complex and, moreover, to have occurred at an earlier time than previously assumed.”

Huge 300-Million-Year-Old Shark Skull Found Deep Inside An Underground Kentucky Cave

Huge 300-Million-Year-Old Shark Skull Found Deep Inside An Underground Kentucky Cave

In the walls of a Kentucky cave, a fossilized shark’s head was found around 300 million years ago.

Scientists suggest that it was part of a striatus of Saivodus, which existed during the Late Mississippian geological age between 340 million and 330 million years ago.

It shows the skull, the lower jaws, cartilage and several teeth of the creature. The team believes that the size of the animal is similar to our modern Great White Shark.

A massive, fossilized shark head dating back some 300 million years ago has been discovered in the walls of a Kentucky cave. Experts believe it belonged to a Saivodus striatus, which lived between 340 and 330 million years ago during the Late Mississippian geological period.

The ancient shark head was uncovered in Mammoth Cave National Park, located in Kentucky, which is Earth’s oldest known cave system, the Louisville Courier-Journal reported.

It was first spotted in a treasure trove of fossils by Mammoth Cave specialists Rick Olson and Rick Toomey, who sent images of their findings to Vincent Santucci, the senior paleontologist for the National Park Service in Washington, D.C., for help with identifying the fossils.

But it was paleontologist John-Paul Hodnett who made the exciting discovery.

‘One set of photos showed a number of shark teeth associated with large sections of fossilized cartilage, suggesting there might be a shark skeleton preserved in the cave,’ he told the Journal.

The head was well-preserved in the cave and the team was able to make out the shark’s skull, lower jaw, cartilage, and numerous teeth. Based on these features, Hodnett believes the shark was about the size of a modern-day great white.

The Mammoth Cave National Park holds a trove of ancient fossil – more than 100 shark species have been discovered so far.

‘We’ve just scratched the surface,’ Hodnett said. ‘But already it’s showing that Mammoth Cave has a rich fossil shark record.’

A discovery such as this is very rare, as cartilage does not usually survive fossilization. However, shark teeth are commonly found, as they are made of bone and enamel, making them easy to preserve.

Hodnett said teeth and dorsal fins of other shark species are also exposed in the cave ceiling and walls.

‘We’ve just scratched the surface,’ Hodnett said. ‘But already it’s showing that Mammoth Cave has a rich fossil shark record.’  

A separate exudation found teeth that they believed belonged to the largest prehistoric shark that lived over 2.5 million years ago.  The discovery was made by divers in an inland sinkhole in central Mexico supporting anthropologists’ theories that the city of Maderia was once under the sea.

Fifteen dental fossils were found in total with thirteen of them believed to belong to three different species of shark, including a megalodon that existed over 2.5 million years ago.

According to the researchers involved, an initial exam of the thirteen shark dental fossils and their size and shape revealed that they might have belonged to the prehistoric and extinct species of megalodon shark (Carcharocles megalodon), the mackerel shark (Isurus oxyrinchus) and the saw shark, the last two of which are not extinct.

Hodnett said teeth (pictured) and dorsal fins of other shark species are also exposed in the cave ceiling and walls
A discovery such as this is very rare, as cartilage does not usually survive fossilization. However, shark teeth are commonly found, as they are made of bone and enamel, making them easy to preserve.

The fossils belong to the period of Pleiocene, the epoch in the geologic timescale that extended from 5 million to 2.5 million years ago, and the Miocene, an earlier geological epoch which extended between 23 and 5 million years ago.

Reports state the Xoc cenote is the largest in the city of Merida with a diameter of 2,034 feet and 91 feet deep.