Scientist Finds 115-Million-Year Dinosaur Blood – Remarkable!

PJ Harvey and another archaeologist excavate bones at a desert dig site — Photo: Gorodenkoff / Shutterstock

Scientists report chemical fingerprints of heme inside cell-like structures in a 115-million-year-old dinosaur bone—and the debate over what, exactly, survived just roared back to life.

Story Snapshot

Researchers detected heme, the oxygen-carrying part of blood, in a Cretaceous dinosaur bone.
The signals sit inside ellipsoid shapes in the bone’s blood vessel canals, not loose sediment.
Several tools lined up on the same story: microscopes, lasers, and mass spectrometers.
Experts agree heme can endure; they disagree whether the shapes are true red blood cells.

What the team says they found inside a dinosaur’s bone

Researchers working on a fossil from Brazil’s Romualdo Formation say they found heme B and heme-derived molecules inside tiny, oval structures lodged in the bone’s vascular canals. Those canals once carried blood. The fossil belongs to Aratasaurus museunacionali, an Early Cretaceous theropod dated to about 115 million years ago. The team describes the ovals as mineralized red blood cells that still hold chemical traces linked to blood, including breakdown products of heme.

Location matters here. The reported signals came from within the bone’s channels rather than from surrounding rock. That context strengthens the argument that the chemicals relate to the animal’s biology, not stray contamination. The authors also report that both heme and chemical fragments from heme degradation occur together. That pairing makes sense if original blood chemistry was locked in place and then altered over time, rather than built fresh by modern microbes.

How they tested an idea most people thought was impossible

The group used electron microscopy to image the ellipsoid bodies, laser-based spectroscopy to scan their chemistry, and high-performance liquid chromatography–mass spectrometry to detect heme B. The Curtin University release frames the result as mineralized red blood cells that preserve intact heme biomolecules. Multiple methods pointing to the same target do not prove the boldest version of the claim, but they do raise the bar for any alternative explanation that must match all these signals at once.

Heme’s role matters. Heme is the iron center that helps hemoglobin carry oxygen in blood. If you look for a blood-specific chemical that could last longest, heme is on the short list. It is small, iron-bound, and can bind to minerals that shield it. The reporting says the detected molecules include both heme B and its degradation products, which is what you would expect after deep time rather than a modern spill or lab mishap.

Why the headline “dinosaur blood” overpromises—and what still holds up

Do not picture liquid blood or fresh cells. The claim involves mineralized structures and chemical traces. No one reports intact hemoglobin, full cells, or DNA. The phrase “dinosaur blood survived” paints a bigger picture than the data support. The safer statement is that heme-related signals occur inside bone structures shaped like red blood cells, at geologic age, and that early mineral growth may have preserved them as rock copies with chemical ghosts of the original material.

An international research initiative has successfully extracted what appear to be mineralized red blood cells from a 115-million-year-old fossilized dinosaur limb. The sample belongs to the holotype specimen of Aratasaurus, a relatively small theropod carnivore that grew to… pic.twitter.com/xu9OMt201R

— Massimo (@Rainmaker1973) November 5, 2026

Independent experts split on the cell claim. Mary Schweitzer, a pioneer in soft-tissue studies, accepts that heme in ancient bone can be real but questions whether these ovals are true dinosaur red blood cells. She points to size and shape that do not match expected bird and reptile cells. Her view tracks with a conservative scientific instinct: respect the chemistry, be strict about morphology. That stance keeps claims inside the lines that the data can actually support today.

How to settle it: map the chemistry to the shapes, then try to break the result

Clear next steps exist. Map heme and its byproducts directly onto cross-sections of single ovals at the nanoscale. Show co-location of chemistry with structure, not with nearby mineral grains. Run blind tests on other bones from the same site and on negatives from the surrounding rock. Publish procedural blanks and raw spectra so other labs can repeat the work. The team’s case grows if independent groups hit the same heme signatures in matching places using the same controls.

Common sense says avoid hype and focus on tests that could prove the idea wrong. If new scans show the heme clings to manganese oxides next to, not inside, the ovals, that weakens the blood link. If the chemistry maps inside the ellipsoids and not in the bone matrix, that strengthens it. Either way, the public wins when claims get tougher and data get clearer. That is how a headline turns into settled science, not just a viral post.

Why this matters beyond dinosaurs

This find, if confirmed as endogenous, would extend the window for biological signals in fossils by tens of millions of years. That opens a new lane for questions about metabolism, body temperature, and even disease in deep time. It would also refine how museums handle specimens. Curators may prioritize keeping internal canals sealed until labs can sample them under clean conditions. One careful protocol can decide whether a fossil holds mere stone—or a chemical diary from a vanished world.