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Ancient Dinosaur Mummies Reveal Stunning 66-Million-Year-Old Details

10/25/2025

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Summary

Story summary

Researchers from the University of Chicago describe two Edmontosaurus annectens specimens preserved as 'mummies' in Wyoming's Lance Formation, dating to 66 million years ago.
The fossils show a clay templating process that preserved skin, spikes, and hooves.
The study, published in Science, offers the first complete reconstruction of a large dinosaur's appearance.
The mummies include features such as a fleshy crest and wedge-shaped hooves.

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Story summary

Researchers from the University of Chicago describe two Edmontosaurus annectens specimens preserved as 'mummies' in Wyoming's Lance Formation, dating to 66 million years ago.
The fossils show a clay templating process that preserved skin, spikes, and hooves.
The study, published in Science, offers the first complete reconstruction of a large dinosaur's appearance.
The mummies include features such as a fleshy crest and wedge-shaped hooves.