North Dakota

Coal miners in North Dakota unearth a mammoth tusk buried for thousands of years

Published

2 years ago

January 7, 2024

Coal miners in North Dakota unearth a mammoth tusk buried for thousands of years

BISMARCK, N.D. – The first person to spot it was a shovel operator working the overnight shift, eyeing a glint of white as he scooped up a giant mound of dirt and dropped it into a dump truck.

Later, after the truck driver dumped the load, a dozer driver was ready to flatten the dirt but stopped for a closer look when he, too, spotted that bit of white.

Only then did the miners realize they had unearthed something special: a 7-foot-long mammoth tusk that had been buried for thousands of years.

“We were very fortunate, lucky to find what we found,” said David Straley, an executive of North American Coal, which owns the mine.

The miners unearthed the tusk from an old streambed, about 40 feet (12.1 meters) deep, at the Freedom Mine near Beulah, North Dakota. The 45,000-acre (18,210-hectare) surface mine produces up to 16 million tons (14.5 million metric tons) of lignite coal per year.

After spotting the tusk, the crews stopped digging in the area and called in experts, who estimated it to be 10,000 to 100,000 years old.

Jeff Person, a paleontologist with the North Dakota Geologic Survey, was among those to respond. He expressed surprise that the mammoth tusk hadn’t suffered more damage, considering the massive equipment used at the site.

“It’s miraculous that it came out pretty much unscathed,” Person said.

A subsequent dig at the discovery site found more bones. Person described it as a “trickle of finds,” totaling more than 20 bones, including a shoulder blade, ribs, a tooth and parts of hips, but it’s likely to be the most complete mammoth found in North Dakota, where it’s much more common to dig up an isolated mammoth bone, tooth or piece of a tusk.

“It’s not a lot of bones compared to how many are in the skeleton, but it’s enough that we know that this is all associated, and it’s a lot more than we’ve ever found of one animal together, so that’s really given us some significance,” Person said.

Mammoths once roamed across parts of Africa, Asia, Europe and North America. Specimens have been found throughout the United States and Canada, said Paul Ullmann, a University of North Dakota vertebrate paleontologist.

The mine’s discovery is fairly rare in North Dakota and the region, as many remains of animals alive during the last Ice Age were destroyed by glaciations and movements of ice sheets, Ullmann said.

Other areas have yielded more mammonth remains, such as bonebeds of skeletons in Texas and South Dakota. People even have found frozen carcasses in the permafrost of Canada and Siberia, he said.

Mammoths went extinct about 10,000 years ago in what is now North Dakota, according to the Geologic Survey. They were larger than elephants today and were covered in thick wool. Cave paintings dating back 13,000 years depict mammoths.

Ullmann calls mammoths “media superstars almost as much as dinosaurs,” citing the ”Ice Age” film franchise.

This ivory tusk, weighing more than 50 pounds (22.6 kilograms), is considered fragile. It has been wrapped in plastic as the paleontologists try to control how fast it dehydrates. Too quickly, and the bone could break apart and be destroyed, Person said.

Other bones also have been wrapped in plastic and placed in drawers. The bones will remain in plastic for at least several months until the scientists can figure how to get the water out safely. The paleontologists will identify the mammoth species later, Person said.

The mining company plans to donate the bones to the state for educational purposes.

“Our goal is to give it to the kids,” Straley said.

North Dakota has a landscape primed for bones and fossils, including dinosaurs. Perhaps the best known fossil from the state is that of Dakota, a mummified duckbilled dinosaur with fossilized skin, Ullmann said.

The state’s rich fossil record is largely due to the landscape’s “low-elevation, lush, ecologically productive environments in the past,” Ullmann said.

North Dakota’s location adjacent to the Rocky Mountains puts it in the path of eroding sediments and rivers, which have buried animal remains for 80 million years or more, he said.

“It’s been a perfect scenario that we have really productive environments with a lot of life, but we also had the perfect scenario, geologically, to bury the remains,” Ullmann said.

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North Dakota

Wheeler-Thomas scores 21 as North Dakota State knocks off Cal State Bakersfield 80-69

Published

2 hours ago

December 12, 2025

Press Room

Wheeler-Thomas scores 21 as North Dakota State knocks off Cal State Bakersfield 80-69

BAKERSFIELD, Calif. (AP) — Damari Wheeler-Thomas’ 21 points helped North Dakota State defeat Cal State Bakersfield 80-69 on Thursday.

Wheeler-Thomas had three steals for the Bison (8-3). Markhi Strickland scored 15 points while shooting 6 of 11 from the field and 3 for 6 from the free-throw line and grabbed five rebounds. Andy Stefonowicz went 4 of 7 from the field (3 for 4 from 3-point range) to finish with 13 points.

Ron Jessamy led the way for the Roadrunners (4-7) with 18 points, six rebounds, two steals and four blocks. CJ Hardy added 13 points. Jaden Alexander also recorded eight points and two steals.

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The Associated Press created this story using technology provided by Data Skrive and data from Sportradar.

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North Dakota

Scientists discover ancient river-dwelling mosasaur in North Dakota

Published

14 hours ago

December 11, 2025

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Scientists discover ancient river-dwelling mosasaur in North Dakota

Some 66 million years ago, a city bus-sized terrifying predator prowled a prehistoric river in what is now North Dakota.

This finding is based on the analysis of a single mosasaur tooth conducted by an international team of researchers from the United States, Sweden, and the Netherlands.

The tooth came from a prognathodontine mosasaur — a reptile reaching up to 11 meters long. This makes it an apex predator on par with the largest killer whales.

It shows that massive mosasaurs successfully adapted to life in rivers right up until their extinction.

The mosasaur tooth was found in 2022 in the Bismarck Area, North Dakota. Credit: Melanie During

Isotope analysis

Dating from 98 to 66 million years ago, abundant mosasaur fossils have been uncovered in marine deposits across North America, Europe, and Africa.

However, these marine reptile fossils have been rarely found in North Dakota before.

In this new study, the large mosasaur tooth was unearthed in a fluvial deposit (river sediment) in North Dakota.

Its neighbors in the dirt were just as compelling: a tooth from a Tyrannosaurus rex and a crocodylian jawbone. Interestingly, all these fossilized remains came from a similar age, around 66 million years old.

This unusual gathering — sea monster, land dinosaur, and river croc — raised an intriguing question: If the mosasaur was a sea creature, how did its remains end up in an inland river?

The answer lay in the chemistry of the tooth enamel. Using advanced isotope analysis at the Vrije Universiteit in Amsterdam, the team compared the chemical composition of the mosasaur tooth with its neighbors.

The key was the ratio of oxygen isotopes.

The mosasaur teeth contained a higher proportion of the lighter oxygen isotope than is typical for mosasaurs living in saltwater. This specific isotopic signature, along with the strontium isotope ratio, strongly suggests that the mosasaur lived in a freshwater habitat.

Analysis also revealed that the mosasaur did not dive as deep as many of its marine relatives and may have fed on unusual prey, such as drowned dinosaurs.

The isotope signatures indicated that this mosasaur had inhabited this freshwater riverine environment. When we looked at two additional mosasaur teeth found nearby, slightly older sites in North Dakota, we saw similar freshwater signatures. These analyses show that mosasaurs lived in riverine environments in the final million years before going extinct,” explained Melanie During, the study author.

Transformation of the Seaway

The adaptation occurred during the final million years of the Cretaceous period.

It is hypothesized that the mosasaurs were adapting to an enormous environmental shift in the Western Interior Seaway, the vast inland sea that once divided North America.

Increased freshwater influx gradually transformed the ancient sea from saltwater to brackish water, and finally to mostly freshwater, similar to the modern Gulf of Bothnia.

The researchers hypothesize that this change led to the formation of a halocline: a structure where a lighter layer of freshwater rested atop heavier saltwater. The findings of the isotope analyses directly support this theory.

The analyzed mosasaur teeth belong to individuals who successfully adapted to the shifting environments.

This transition from marine to freshwater habitats (reverse adaptation) is considered less complex than the opposite shift and is not unique among large predators.

Modern parallels include river dolphins, which evolved from marine ancestors but now thrive in freshwater, and the estuarine crocodile, which moves freely between freshwater rivers and the open sea for hunting.

Findings were published in the journal BMC Zoology on December 11.

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