66-Million-Year-Old Dinosaur Bone Yields Traces of Real Collagen
For decades, the standard assumption in paleontology has been simple: once an animal fossilizes, its original biological molecules are gone, replaced entirely by minerals over millions of years. A newly analyzed dinosaur hip bone is adding serious weight to the case that this assumption may be wrong.
A Three-Decade Scientific Argument
New research led by the University of Liverpool provides strong evidence that some Mesozoic fossils, including dinosaur bones and teeth, can retain traces of their original organic material. Using advanced analytical methods, researchers detected remnants of collagen in the hip bone of an Edmontosaurus, a duck-billed dinosaur, adding important new evidence to a scientific debate that has continued for about 30 years. The findings were published in the journal Analytical Chemistry.
The study examined an exceptionally well-preserved Edmontosaurus sacrum, the fused group of vertebrae connecting the spine to the pelvis, weighing 22 kilograms. The fossil was excavated from Upper Cretaceous rock layers in South Dakota’s Hell Creek Formation, a site famous for preserving fossils from the final stretch of the age of dinosaurs, and is now part of the University of Liverpool’s collections.
Hunting for Molecules Inside Stone
Because of its unusually good preservation, the fossil gave researchers an opportunity to apply several modern techniques, including protein sequencing and mass spectrometry, a method that identifies molecules by measuring their mass and chemical properties. In this case, it allowed the team to search for molecular signatures associated with collagen, the major structural protein found in bone.
“This research shows beyond doubt that organic biomolecules, such as proteins like collagen, appear to be present in some fossils,” said Professor Steve Taylor, chair of the Mass Spectrometry Research Group at the University of Liverpool’s Department of Electrical Engineering and Electronics. “Our results have far-reaching implications. Firstly, it refutes the hypothesis that any organics found in fossils must result from contamination.”
Ruling Out Contamination
That contamination question has sat at the center of the fossil-protein debate for years. Critics have long argued that organic material detected in fossils could have entered the specimens much later, introduced by microbes, soil, handling, or other environmental sources rather than surviving from the animal’s original tissue. The new results strengthen the case that at least some of the detected material is genuinely associated with the original fossilized bone.
Researchers from UCLA contributed tandem mass spectrometry work that detected and quantified, for the first time in this context, the amino acid hydroxyproline, a marker strongly and specifically associated with collagen when found in bone. Its presence offered an additional chemical line of evidence confirming decayed collagen. Meanwhile, the Centre for Proteome Research at the University of Liverpool identified fragments of collagen alpha-1, the main form of collagen found in bone tissue, and specialists at the University’s Materials Innovation Factory carried out further analyses to confirm the results.
A Century of Old Photographs, Reexamined
Beyond confirming that ancient proteins can survive, the findings may hand researchers a practical new tool. “It suggests that cross-polarized light microscopy images of fossil bones, collected for a century, should be revisited,” Taylor said. “These images may reveal intact patches of bone collagen, potentially offering a ready-made trove of fossil candidates for further protein analysis.”
Cross-polarized light microscopy uses specially filtered light to reveal fine structural detail that ordinary microscopy can miss, and scientists have been collecting such images of fossil bone for roughly a hundred years. If distinctive patches of preserved collagen can be recognized retroactively in that century-old archive, researchers could have a substantial, ready-made list of fossils worth revisiting with modern protein analysis techniques, potentially saving years of blind searching.
What Molecules Might Still Reveal
“This could unlock new insights into dinosaurs, for example revealing connections between dinosaur species that remain unknown,” Taylor said. If original proteins really can persist across tens of millions of years, they could eventually help settle evolutionary relationships that fossil anatomy alone struggles to resolve.
Taylor was also candid that the discovery raises as many questions as it answers. “The findings inform the intriguing mystery of how these proteins have managed to persist in fossils for so long,” he said. Proteins are generally expected to break down relatively quickly on a geological timescale, so understanding exactly what allowed collagen fragments to survive inside this particular bone for 66 million years remains an open scientific puzzle.
A Long-Running Debate Edges Toward Resolution
The idea of soft tissue and original proteins surviving in dinosaur fossils has been controversial since it first gained attention in the early 2000s, drawing both excitement and considerable skepticism from the wider paleontological community. By bringing together specialists from the University of Liverpool’s Mass Spectrometry Research Group, the Centre for Proteome Research, the Materials Innovation Factory, and UCLA, and by using multiple independent analytical techniques to confirm the same result, this study adds a notably well-corroborated data point to that long-running argument.
Together, the evidence appears to move the field closer to resolving whether original biological molecules can genuinely remain in extremely old fossils. If confirmed by further research on additional specimens, it would open new possibilities for studying extinct animals at the molecular level, offering scientists a path to biological information once assumed to have vanished entirely during fossilization.
Sources
Related Articles
