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Scientists discover ancient river-dwelling mosasaur in North Dakota

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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.

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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?

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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.

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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. 

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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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North Dakota

Morton County did not violate North Dakota’s open records law when the County Auditor, within a reasonable time, informed the requester that the requested records were not in the County’s possession.. – North Dakota Attorney General

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Morton County did not violate North Dakota’s open records law when the County Auditor, within a reasonable time, informed the requester that the requested records were not in the County’s possession..

February 27, 2026

Media Contact: Suzie Weigel, 701.328.2210

BISMARCK, ND – Karen Jordan requested an opinion from this office under N.D.C.C. § 44-04-21.1 asking whether Morton County violated N.D.C.C. § 44-04-18 by failing or refusing to provide records.

Conclusion: It is my opinion that Morton County’s response was in compliance with N.D.C.C. § 44-04-18.

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Link to opinion 2026-O-06

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ND Supreme Court Justice Daniel Crothers retiring, stepping onto new path

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ND Supreme Court Justice Daniel Crothers retiring, stepping onto new path


BISMARCK, N.D. (KFYR) – The North Dakota Court System threw a reception for a retiring member of the state Supreme Court.

Justice Daniel Cothers is leaving after serving for more than 20 years.

He plans to step down on Feb. 28.

Before Crothers became a judge, he served as a lawyer and as president of the State Bar Association of North Dakota.

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Mark Friese is set to replace Crothers starting March 9.

“He knows what is important and what to keep focused on. Justice Friese will be an exceptional replacement to me on the bench,” said Crothers.

Crothers plans to keep up on teaching gigs and spend time at his family’s farm as he steps into retirement.



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North Dakota ambulance providers losing money on every run, according to survey

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North Dakota ambulance providers losing money on every run, according to survey


By: Michael Achterling

FARGO (North Dakota Monitor) – North Dakota ambulance service providers lost nearly $500 on average for every patient transported to a medical facility last year, according to a survey.

The recent survey of three dozen providers in the state, conducted by PWW Advisory Group, was the result of a study created by House Bill 1322 passed during the 2025 legislative session.  The group presented the results to the Legislature’s interim Emergency Response Services Committee on Wednesday.

The average revenue generated from an ambulance transport was about $1,100 during 2025, but the expenses were nearly $1,600, said Matt Zavadsky, an EMS and mobile health care consultant with PWW, based in Pennsylvania.

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“They are losing money every time they respond to a call,” Zavadsky said during the meeting. “That financial loss has to be made up, typically, by local tax subsidies, fundraisers, bake sales, or all too often, service reductions to try and match expenses with the revenue they can generate.” 

He said the problem cannot be fixed by billing reform alone because the revenue generated isn’t enough to fund the cost of readiness, such as personnel, equipment and supplies, among other items.

The survey highlighted 74% of ambulance provider expenses went to personnel costs, but equipment costs have also increased in recent years.

Zavadsky said survey respondents plan to invest about $12.9 million into vehicle and equipment purchases over the next five years, averaging to about $358,000 per provider. However, the cost of a new ambulance has risen to between $275,000 to $480,000 per vehicle. Prior to the COVID-19 pandemic, a new ambulance could cost up to $250,000, he said.

There are more than 100 ambulance service providers in North Dakota. The 36 survey respondents represented a diverse group of providers from city and county services to district-owned, hospital-based and private providers, he said. The average patient transport distance is 34 miles, according to the survey.

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Zavadsky said the survey respondents reported 53% of their total revenue was generated from fees for service with the remaining 47% coming from local tax subsidies, state grants and other fundraising.

“What you guys are experiencing in North Dakota and what is happening in the local communities … is not the fault of the local communities, not the fault of the state, this is just our new normal,” Zavadsky said.

Rep. Todd Porter, R-Mandan, owner of Metro-Area Ambulance Service which serves Morton and Burleigh counties, said Medicare patients reimburse ambulance providers at a much lower rate than private insurance and Medicaid patients. He added Medicare patients make up about 60% of the call volume in the Bismarck-Mandan area.

“If we’re being underpaid for 60% of our call volume, then we have to make it up some place,” Porter said.

He said some providers can make up that difference in reimbursement with tax dollars, but not all providers have that option.

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“We do other contracted work for nursing homes, hospitals, funeral homes in order to make up that difference,” Porter said. “This is a federal government problem. This is a CMS (Centers for Medicare and Medicaid Services) problem that we’ve known about for years.”

Porter also said ambulance services are not reimbursed for responding to a call with a Medicare patient that doesn’t require a transport to a hospital. According to the survey, about 17% of all ambulance calls don’t require transport to a medical facility.

The survey also showed about 2,300 of the nearly 33,600 patient transports billed last year ended up in collections after being more than 90 days delinquent, totalling $2.7 million, Zavadsky said. The average total of a claim sent to collections was about $1,100.

Zavadsky estimated the total of unpaid claims for more than 100 providers across North Dakota was about $5.8 million in 2025. Some providers don’t have procedures to pursue delinquent billing in collections, he said.

Rep. Jim Grueneich, R-Ellendale, chair of the committee, said the committee will take a deeper look at the data presented on Wednesday and may have recommendations, and possible draft legislation, to address the issue in the 2027 legislative session.

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