A recent study has revealed that fragments of original proteins may have survived in dinosaur fossils for over 66 million years. Researchers from the University of Liverpool identified these molecules in a remarkably preserved Edmontosaurus specimen, challenging the long-held belief that dinosaur bones are purely mineralized. The findings suggest that some fossils could still retain molecular traces from the age of dinosaurs.
For decades, scientists assumed that organic molecules in fossils would inevitably degrade over geological time. The idea that proteins might persist in bones has sparked intense debate in the paleontology community. Published in Analytical Chemistry in 2025, the study shows that modern laboratory techniques now allow researchers to detect biomolecular traces once considered impossible to recover.
Preserved Collagen Discovered In Edmontosaurus Bone
The study examined a 22-kilogram Edmontosaurus sacrum, part of the dinosaur’s hip, recovered from South Dakota’s Hell Creek Formation. The research reported that the fossil contained remnants of collagen, the primary structural protein in bones. To verify these results, the study team applied multiple analytical techniques, including protein sequencing and various forms of mass spectrometry, ensuring the molecules were original rather than modern contamination.
Hydroxyproline, an amino acid closely linked to collagen in bone, was also detected, confirming that degraded fragments were genuine. Professor Steve Taylor, chair of the Mass Spectrometry Research Group at the University of Liverpool, noted that:
“This research shows beyond doubt that organic biomolecules, such as proteins like collagen, appear to be present in some fossils.” He added: “Our results have far-reaching implications. Firstly, it refutes the hypothesis that any organics found in fossils must result from contamination.”
Soft Tissue in Ancient Fossils
Soft tissue and protein preservation in dinosaur fossils has divided paleontology for more than thirty years. Early discoveries, like Mary Schweitzer’s 2005 reportof soft tissue inside a Tyrannosaurus rex, faced skepticism, with critics suggesting contamination or bacterial residue instead of ancient molecules.
The Liverpool study stands out because it tested the same fossil in several different ways. Using microscopes, chemical analysis, and protein sequencing all together helped make sure the results weren’t contaminated and that the molecules really came from the dinosaur.
The team says this careful approach makes a stronger case that collagen fragments can stick around in fossils, challenging what scientists used to think.
Redefining Dinosaur Life With Molecular Evidence
The discovery of preserved proteins is a big deal for paleontology. Tiny traces at the molecular level could tell us more about how dinosaurs grew, aged, and functioned, as well as reveal evolutionary links that bones alone can’t show.
The study even suggested that fossils collected decades ago might already hold overlooked bits of collagen, which can sometimes be spotted in older microscope images. Taylor explained that:
“These images may reveal intact patches of bone collagen, potentially offering a ready-made trove of fossil candidates for further protein analysis,” adding that, “this could unlock new insights into dinosaurs, for example revealing connections between dinosaur species that remain unknown.”
These findings also make us wonder how such molecules can survive for tens of millions of years. The scientists think that certain interactions between bone minerals and specific burial conditions might protect collagen from breaking down completely.
Edmontosaurus fossils, famous for detailed skin impressions and soft tissue, are a great example of this kind of preservation. Some fossils might even act like molecular time capsules, keeping traces of prehistoric life much longer than anyone thought possible.
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