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30,000-Year-Old Feather Fossil Is The First Of Its Kind Ever Found. Discovery Reveals Unprecedented Information About Ancient Birds
Valentina Rossi saw for the first time the fossil of a 30,000-year-old griffon vulture while she was a master’s student in 2014, in Rome. The bird, found in 1889 near the Italian capital, was in excellent condition. Rossi was fascinated to observe the fossilized imprint of the animal’s head and a preserved fossil feather while listening to researcher Dawid Iurino’s explanation.
At the time, Iurino commented that the exact composition of the fossilized feathers was still a mystery. Determining this would require more advanced methods, and according to him, this would be a mission for future studies.
The analysis of such well-preserved structures went beyond what the group of paleontologists could do at that moment.
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More than a decade later, the answer finally arrived. A new study led by Rossi, with collaboration from Iurino and other researchers, was published in the journal Geology. The research revealed that the feathers were fossilized by zeolites—minerals formed from aluminum and silicon compounds.
Unprecedented Discovery
This is the first time scientists have reported the mineralization of soft tissues by zeolites. The discovery opens new possibilities for paleontology. Rossi, now a paleontologist at University College Cork in Ireland, explains that finding feathers preserved in three dimensions is already very rare. Finding them mineralized is even more unusual.
The presence of zeolites indicates that the fossil feather’s fossilization occurred due to the interaction between volcanic rocks and water. As a result, scientists can now explore volcanic environments as potential sites for the preservation of soft tissues.
Origin of Fossilized Feathers: Microscope and Spectroscopy
To confirm the mineral origin of the fossilized feathers, researchers used a high-power electron microscope. They studied the shape and texture of the preserved structures.
Then, they applied different spectroscopy techniques to analyze the chemical structure. The results confirmed the presence of bonds consistent with zeolites.
The mineralization of soft tissues generally depends on the chemical composition. Muscle tissues, for example, are frequently fossilized by calcium phosphate, as they already contain calcium and phosphorus.
However, feathers do not contain silicon or aluminum, which made the presence of zeolites an intriguing point.
Hypotheses About The Chemical Process
According to Rossi, mineralization may have occurred due to the pH of the decomposing tissue. Mary Schweitzer, emeritus professor at North Carolina State University, who did not participate in the study, commented that certain decomposing molecules may attract aluminum or silica. She stated that more research is still needed to fully understand this transformation.
Previous studies have already shown that zeolites can form in biological materials submerged in solutions containing silicon and aluminum. The novelty now is observing this in naturally fossilized feathers, something unprecedented until now.
Study of The Fossil Feather: The End of The Vulture
With the data obtained, scientists were able to assemble a taphonomic model—a reconstruction of the last moments of the animal until its fossilization. There were no signs of injuries. The researchers suspect that the vulture may have died due to toxic gases emitted during a volcanic eruption.
Even after death, the animal’s body remained intact. It may have been covered by a cooler, slower volcanic flow. This would explain the preservation of tissues that would normally be destroyed by heat.
The lava hardened with the bird’s body underneath. After some time, rainwater penetrated the rock and generated a fluid with high mineral content.
This fluid reacted with the bird’s tissues. The chemical combination generated the zeolites, which began to replace the tissue before it completely decomposed. Thus, the feathers turned to stone.
New Clues for Future Discoveries
The authors suggest that this type of fossilization may have occurred with many other organisms over time. According to them, it is possible that entire categories of fossils are being overlooked due to being in rock formations considered unsuitable.
Generally, volcanic areas are not seen as good places to search for fossils, due to the violence of lava flows. But the new discovery shows that some exceptions exist. The research may change how scientists choose where to excavate and what to look for.
With information from ZME Science.
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