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It trod the Earth 66 million years ago; now Winona State is home to a remarkable dinosaur discovery

On Thursday, Dec. 4, 2025, Winona State University installed Medusa, a rare Edmontosaurus fossil, in the Science Laboratory Center.
The excavation was led by Schroeder with involvement from Hell Creek Fossils and WSU personnel after bones were discovered on private land near Marmarth, North Dakota, prior to December 4, 2025.
An articulated skeleton shows the Edmontosaurus specimen includes back, hips and limbs and measured as big as a city bus, rivaling Tyrannosaurus rex in size.
WSU conservators will begin painstaking preparation work to carefully remove rock from the plaster jacket, and a removed building window allowed entry; the fossil will be displayed for students, researchers and the community, with Beatty hoping it sparks scientific interest.
The specimen's rarity positions it to yield rare insights into dinosaur biology if confirmed as a dinosaur mummy, though rattlesnakes and the fossil's missing head and tail limit study.

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It trod the Earth 66 million years ago; now Winona State is home to a remarkable dinosaur discovery

WINONA, Minn. — It was a dinosaur that once roamed the Earth 66 million years ago, and now a big piece of it sits housed in a lab at Winona State University in one of the rarest and largest fossil discoveries in recent memory. It was called Edmontosaurus. And the duck-billed dinosaur was really big. From the tip of its snout to the end of its tail, it was as big as a city bus. And it lived alongside its contemporaries Tyrannosaurus rex and Trice…

8 days ago·Cherokee County, United States

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