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The Thescelosaurus moved stealthily alongside the seashore. Stretching about 12 toes lengthy and weighing about 500 kilos, the thickly muscled dinosaur was in all probability searching for meals — or attempting to keep away from changing into a meal.

That includes distinguished bony eyebrows and a sharp beak, Thescelosaurus plodded alongside on two toes with the majority of its physique leaning ahead whereas a protracted tail stretched backward for steadiness. All of a sudden, the dinosaur lifted its head and regarded round, alarmed because the calm was damaged by a sequence of unnerving pure forces.

The bottom began shaking with intense vibrations whereas water within the close by sea sloshed about in response. The sky stuffed with burning embers, which drifted down and set hearth to the plush primordial forest.

Thescelosaurus panicked and regarded to flee — however it was too late. All the pieces modified in a heartbeat as a 30-foot-high wave of mud and particles got here racing up the seaway from the south, sweeping away life and limb within the course of. The dinosaur was caught within the damaging deluge, its leg ripped off on the hip by the devastating surge.

That second — 66 million years in the past on the finish of the Cretaceous interval, when an earth-shattering asteroid ended the reign of the dinosaurs — is frozen in time right now via a surprising fossil discovered final yr on the Tanis dig website in North Dakota. This completely preserved leg clearly exhibits the pores and skin, muscle and bones of the three-toed Thescelosaurus.

Whereas the small print of the dying state of affairs described above are embellished, they’re based mostly on exceptional new findings and accounts by Robert DePalma, lead paleontologist at Tanis.

“We’re by no means going to say with 100% certainty that this leg got here from an animal that died on that day,” the scientist mentioned. “The factor we will do is decide the probability that it died the day the meteor struck. Once we have a look at the preservation of the leg and the pores and skin across the articulated bones, we’re speaking on the day of impression or proper earlier than. There was no superior decay.”

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DePalma and the dinosaur leg will likely be featured in two episodes of “Nova” on PBS airing back-to-back on Wednesday: “Dinosaur Apocalypse: The New Proof” and “Dinosaur Apocalypse: The Final Day.” Biologist and pure historian Sir David Attenborough will host the applications, which have been produced along side the BBC.

The leg and several other different relics found on the North Dakota website are the very first fossils discovered exhibiting the dying and destruction that occurred when a 10-mile-long house rock struck the Yucatán Peninsula within the Gulf of Mexico. This impression occasion 66 million years in the past doomed the dinosaurs and led to the mass extinction of 75 p.c of animal and plants on Earth.

On the time, the world was a a lot hotter place. There have been no icecaps, and water ranges have been larger. The North American continent was cut up in two by the Western Inside Seaway. Tanis is positioned on what was the sting of that huge river, which grew to become a conduit of carnage after the asteroid struck. The shock waves from almost 3,000 miles away induced the seaway to erupt with a tsunami of epic proportions.

As DePalma identified, Thescelosaurus by no means stood an opportunity.

“You wouldn’t need to be there on that day,” he mentioned. “There was a turbulent wall of dying heading up the river. As well as, all these glowing spherules are falling out of the sky. They’re like beads of superheated glass reentering the Earth’s environment after being ejected from the crater website on the Yucatán. Then there was all this seismic shaking. It was actually hell on earth.”

A dinosaur’s loss, although, is a paleontologist’s achieve. After Tanis was found in 2008, scientists started to appreciate the fossils there have been in all probability created throughout that big-impact second. A sequence of key discoveries have been made, together with the dinosaur leg, the embryo of a pterosaur nonetheless in its shell, a turtle pierced by a piece of wooden and the well-preserved pores and skin of a triceratops. Many of those fossils are being introduced to the general public for the primary time within the PBS documentaries.

Maybe most telling have been the fossilized fish unearthed on the website in 2019, which caught many scientists abruptly. In these petrified stays, researchers discovered the embedded proof they wanted to substantiate the declare that the animals died when the asteroid struck: the glass spheres, often known as ejecta, that got here raining down from the sky that fateful day.

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“These have been fish that died on that day,” DePalma mentioned. “We all know that as a result of they’d ejecta from the impression of their gills.”

Researchers have unearthed numerous samples of those glass spheres, all containing the signature chemical parts typical of a serious impression occasion. Made up of sand and different earthly supplies, the molten glass was ejected into the environment by the explosion attributable to the asteroid putting the planet — estimated to be the equal of 10 billion atomic bombs. Inside a kind of round fossils is a tiny speck of rock which may be from the killer asteroid itself.

DePalma, a postgraduate researcher on the College of Manchester in England and adjunct professor of geosciences at Florida Atlantic College, has headed efforts at Tanis since 2012. He and different scientists on the staff have printed a number of main papers describing the discoveries and outlining the scientific methodology used up to now the fossils and different proof.

DePalma asserts that what occurred then is instantly related to the world right now.

“I’ve been requested, ‘Why ought to we care about this? Dinosaurs have been useless for thus lengthy,’ ” he mentioned. “It’s not only for paleo nerds. This instantly applies to right now. We’re seeing mass die-offs of animals and biomes which might be being put via very anxious conditions worldwide. By trying via this window into the previous, we will apply these classes to right now.”

To supply the “Nova” episodes, DePalma labored instantly with one among his heroes — the 96-year-old Attenborough — in reviewing the discoveries and discussing their significance.

“Sir David and I interacted and consulted on all the pieces,” DePalma mentioned. “It was an amazing expertise. He can not stifle his enthusiasm. Once we have been trying on the fossils and speaking about what they meant, you couldn’t separate the 2 of us. We saved occurring and on about them. We’d have been there all day if nobody had stopped us.”

“Dinosaur Apocalypse” airs Wednesday at 9 p.m. ET on PBS.

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