# Scientists Identify 115-Million-Year-Old Molecular Blood Traces in Dinosaur Fossil Researchers discovered mineralized red blood cells and heme compounds in a Brazilian theropod's limb bone. - **Source:** [Science & tech Articles | Mail Online](https://www.dailymail.com?ns_mchannel=rss&ns_campaign=1490&ito=1490) - **Published:** 2026-11-02 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/cb652c87-53b7-4893-8408-20b6fcf2fe45 ## Groundbreaking Molecular Discovery Researchers from Curtin University have identified molecular traces of blood within the leg bone of an Aratasaurus museunacionali, a small theropod that lived 115 million years ago in Brazil. This discovery, published in the Proceedings of the National Academy of Sciences, marks the first time scientists have chemically confirmed heme-derived compounds. ## The Aratasaurus Specimen The fossilized remains were originally recovered from the Romualdo Formation in 2008 and stored at the National Museum of Brazil. The juvenile theropod measured roughly 3 meters in length and weighed approximately 34 kilograms. Scientists note that the specimen was not a display-quality fossil, appearing unremarkable before undergoing detailed microscopic analysis. ## Chemical Evidence of Heme Using liquid chromatography-mass spectrometry, the team detected heme B, the iron-containing component of hemoglobin responsible for oxygen transport. These chemical signatures were found specifically within vascular canals inside the bone. The researchers successfully distinguished these dinosaur-derived molecules from surrounding microbial contaminants by comparing them against chlorophyll-based compounds found in the sediment. ## Role of Hausmannite The exceptional preservation is attributed to hausmannite, a manganese oxide mineral that acted as a natural time capsule. This mineral stabilized the delicate biological structures before they could degrade. Researchers believe the dinosaur was rapidly buried in a low-oxygen, microbially rich environment, which facilitated this rare mineralized preservation process over millions of years. ## Challenging Paleontological Assumptions The finding contradicts the long-held belief that complex biomolecules cannot survive deep time. By identifying these molecular echoes, the study suggests that museum collections worldwide may contain hidden biological data. This shifts the focus of paleontology from purely skeletal morphology toward the recovery of original molecular information from ancient, nondescript fossil fragments. ## Scientific Debate Continues While the chemical identification of heme is widely noted, the interpretation of the microscopic structures remains debated. Expert Mary Schweitzer argues that the observed cell shapes do not match the expected appearance of non-mammalian red blood cells, which typically retain a nuclear bulge. She suggests the structures might be something else entirely. ## No Jurassic Park Scenario Despite the excitement, researchers emphasize that no dinosaur DNA was recovered. The discovery provides a chemical fingerprint of the animal's physiology rather than a genetic blueprint. Experts like Darren Griffin confirm that the likelihood of finding usable dinosaur DNA is negligible, making any form of de-extinction or cloning scientifically impossible today. ## Comparative Biological Insights The team compared the fossilized cells to those of modern birds and crocodiles, the dinosaur's closest living relatives. The Aratasaurus cells were found to be significantly larger, raising questions about whether this size difference reflects natural biological variation or swelling during the fossilization process. Further study could clarify these evolutionary physiological traits. ## New Analytical Frontiers This research opens new avenues for investigating ancient metabolism, activity levels, and blood evolution. By applying modern molecular techniques to old specimens, scientists can now ask questions that skeletal anatomy alone cannot answer. The study demonstrates how coordinated efforts across multiple scientific disciplines can unlock insights into the biology of extinct creatures. ## Implications for Astrobiology The discovery has potential relevance beyond Earth. Understanding how delicate biomolecules survive in harsh, ancient environments provides a framework for identifying evidence of life elsewhere in the universe. If such traces can persist for 115 million years on Earth, similar molecular signatures might theoretically linger in extraterrestrial environments, aiding future space exploration. ## Methodological Rigor The team emphasized the importance of in situ analysis, investigating the chemistry directly within the bone to ensure context. By combining microscopy, mineralogical analysis, and geochemistry, they avoided the pitfalls of extracting molecules from fossils without knowing their origin. This rigorous approach is essential for validating extraordinary claims in the field of paleontology. ## Future Research Directions The study concludes that the focus should remain on determining how much genuine molecular information deep time can preserve. Future work will likely involve re-examining existing museum collections with these advanced analytical methods. This could lead to a broader understanding of how biological materials interact with minerals during the fossilization process. ## Sources covering this story - [Science & tech Articles | Mail Online — Scientists Discover 115-Million-Year-Old Dinosaur Blood Traces](https://www.dailymail.com/sciencetech/article-16259143/Real-life-Jurassic-Park-Scientists-dinosaur-BLOOD.html?ns_mchannel=rss&ns_campaign=1490&ito=1490) - [Latest from Live Science — Ancient Dinosaur Fossil Reveals Potential 115 Million-Year-Old Blood Traces](https://www.livescience.com/animals/dinosaurs/traces-of-ancient-blood-found-in-115-million-year-old-dinosaur-fossil-new-study-claims) - [Science | The Guardian — Fossilised Red Blood Cells Discovered in 115-Million-Year-Old Dinosaur Bone](https://www.theguardian.com/science/2026/nov/02/fossilised-red-blood-cells-aratasaurus-dinosaurs-bone) - [Science | The Guardian — Fossilised Red Blood Cells Discovered in 115-Million-Year-Old Dinosaur Bone](https://www.theguardian.com/science/2026/nov/02/fossilised-red-blood-cells-aratasaurus-dinosaurs-bone) - [All Articles | Discover Magazine — Ancient Dinosaur Blood Discovered in 115-Million-Year-Old Fossil](https://www.discovermagazine.com/evidence-of-ancient-blood-found-for-the-first-time-in-a-115-million-year-old-dinosaur-fossil-49887) - [New Scientist — Oldest Dinosaur Red Blood Cells Discovered in 115-Million-Year-Old Fossil](https://www.newscientist.com/article/2596881-dinosaur-red-blood-cells-recovered-from-115-million-year-old-fossil/?utm_campaign=RSS|NSNS&utm_content=home&utm_medium=RSS&utm_source=NSNS) - [Popular Science — Intact Biomolecules Discovered in 115-Million-Year-Old Dinosaur Fossils](https://www.popsci.com/science/first-dinosaur-blood-fossil-discovery/) - [Popular Science — Intact Red Blood Cells Discovered in 115-Million-Year-Old Dinosaur Fossils](https://www.popsci.com/science/first-dinosaur-blood-fossil-discovery/) - [Sci.News: Breaking Science News — 115-Million-Year-Old Dinosaur Bones Preserve Chemical Traces of Red Blood Cells](https://www.sci.news/paleontology/cretaceous-dinosaur-red-blood-cells-15169.html) - [Slashdot — Intact Biomolecules Discovered in 115-Million-Year-Old Dinosaur Fossils](https://science.slashdot.org/story/26/11/04/066209/dinosaur-blood-found-in-fossils-for-the-first-time?utm_source=rss1.0mainlinkanon&utm_medium=feed) - [Reddit Science — Ancient Dinosaur Fossil Reveals Preserved Red Blood Cells](https://www.reddit.com/r/science/comments/1xmcq4p/scientists_found_what_look_like_red_blood_cells/) --- _Summary written by Brifing from the original reporting. 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