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66-Million-Year-Old Edmontosaurus Mummies Discovered in Wyoming

10/28/2025

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Summary

Story summary

The University of Chicago researchers report the discovery of Edmontosaurus annectens mummies from about 66 million years ago in Wyoming's badlands, in a study published in Science.
The study shows mummies were preserved via clay templating, with a thin clay layer forming a negative imprint of the body.
Findings describe Edmontosaurus with a fleshy crest, tail spikes, small scales, and flat-bottomed hooves, marking it as the first known hooved reptile.

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Story summary

The University of Chicago researchers report the discovery of Edmontosaurus annectens mummies from about 66 million years ago in Wyoming's badlands, in a study published in Science.
The study shows mummies were preserved via clay templating, with a thin clay layer forming a negative imprint of the body.
Findings describe Edmontosaurus with a fleshy crest, tail spikes, small scales, and flat-bottomed hooves, marking it as the first known hooved reptile.