Workers began drilling beneath a Denver museum parking lot. They expected routine underground rock.
The focus was on geothermal energy. So the drill entered the deep beside the museum building with that target at its heart.
But fragments started appearing. At first, they looked insignificant. The usual broken rock. Dust. Sediment.
But several remnants presented unusual textures and shapes.
Museum researchers jumped to inspect them.
What ancient secret forced its way to the surface?
How drilling for the future struck the ancient past
The museum’s plan was to to move to green energy through with a geothermal solution.
Naturally, this required deep drilling. So crews set to work boring hundreds of feet below the parking area.
The routine nature of the work was deceptive. Because unusual debris started emerging from the borehole.
Some of it was clearly fossilized. And then actual bone with a clear structure was revealed.
That detail stood out fast.
Construction came to a halt and researchers swarmed the site. More and more precious fragments were carefully brought to light.
Unfortunately, the power of the drill had already done irreversible damage to much of the archaeological treasure.
Still, enough survived for scientists to recognize what they had found.
The bones had been hidden in ancient sediment layers buried beneath modern Denver.
It’s highly unusual for large dinosaur fossils to appear during construction. Especially in dense urban areas.
That alone made the discovery special. But it wasn’t the only aspect.
A construction drill just brought dinosaurs to Colorado
Researchers dated the sediment to the late Cretaceous period.
Back then, Denver did not exist.
The region looked comfortable: warm, wet, and heavily vegetated.
According to fossilized vegetation that also came up, ancient rivers crossed broad floodplains teeming with animal life. But it was dinosaurs that still dominated the landscape.
That was Colorado 67.5 million years ago.
That placed the animal near the final chapter of dinosaur history.
Only a relatively short geological window remained before the mass extinction event arrived.
Some features resembled large plant-eating dinosaurs that appeared to have cousins in western North America.
Enough about the discovery is strange already, but the location of the underground bone cache made the discovery feel stranger.
Nobody imagined dinosaur remains rested—fittingly—below the grounds of the Denver Museum the entire time.
The drill slammed into cold dinosaur bones instead of hot rock
Researchers from the Denver Museum excitedly confirmed the fragments were definitely dinosaur.
Paleontologists narrowed it down to two herbivorous Great Plains candidates: an Edmontosaurus (a massive duck-billed dinosaur) or a Thescelosaurus (a smaller, two-legged plant-eater).
An exact species identification was impossible because of the drill’s shattering impact.
Still, it was undeniable preserved evidence from 67.5 million years ago.
The find was identified as a vertebral centrum—the central portion of a dinosaur’s backbone.
And that’s how an energy project ended up revealing a time capsule of an ancient past.
Denver Museum was as surprised as anyone else
“Completely accidental” is how researchers described the discovery of Denver’s official deepest fossil.
Crews only planned to “simply” install geothermal infrastructure beneath the parking lot.
Instead, they opened a narrow window into Colorado’s prehistoric past 763 feet (233 meters) under their feet.
The find also revealed something significant about Western cities.
Ancient fossil layers can still survive beneath modern streets and buildings unnoticed for millions of years.
If a routine parking lot renovation can strike a 67-million-year-old dino, how much of prehistoric America is still going to be paved over?
And how much already has been?
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