66-Million-Year-Old Collagen in Edmontosaurus Bone: “Living” Fossil That Challenges Everything We Know About Fossilization!

In a study published January 2025 in Analytical Chemistry, University of Liverpool researchers have detected genuine collagen remnants inside a 66-million-year-old Edmontosaurus sacrum from South Dakota’s Hell Creek Formation—directly contradicting the long-held dogma that organic molecules cannot survive fossilization over deep time.

The 22-kilogram hip bone, exceptionally well preserved in fine-grained sediments, was subjected to multiple independent techniques: cross-polarized light microscopy (revealing collagen-like birefringence), tandem LC-MS (quantifying hydroxyproline, a collagen-specific amino acid), and bottom-up proteomics. The collagen peptide sequences match those previously reported from another hadrosaur and even Tyrannosaurus rex, confirming endogenous origin rather than contamination.

Lead author Lucien Tuinstra and corresponding author Steve Taylor state: “This provides multiple lines of evidence that proteinaceous material can persist in dinosaur bone for tens of millions of years.” The discovery resolves a 30-year debate sparked by Mary Schweitzer’s earlier soft-tissue finds and suggests that exceptional preservation environments—rapid burial in low-oxygen settings—can shield biomolecules far longer than textbooks allow.

Critically, the results imply that many museum fossils previously dismissed as purely mineral may still harbor original proteins, opening doors to ancient DNA proxies, isotopic studies of diet, and even phylogenetic insights from protein sequences. “Cross-polarized light images collected for a century should be revisited,” Taylor urges.

This “living fossil” inside stone forces paleontology to confront a paradigm shift: fossilization is not total molecular erasure. As more bones are re-analyzed with modern mᴀss spectrometry, the 66-million-year barrier may crumble further—proving that some of Earth’s oldest bones still whisper secrets of life itself.