A mystery that has puzzled scientists for decades has been solved regarding ancient tetrapods, which were amphibian-like creatures that lived more than 300 million years ago. The Jarrow Assemblage, an important fossil site in Ireland, contains fossils of these ancient tetrapods that appear to hav
, and the Gemological Institute of America used a combination of computed tomography, to produce X-Ray images of the fossil, and laser ablation, to analyze the chemistry of the bones to investigate the causes of this alteration.below showing the alteration in the bones. Credit: Dr. Aodhan O’Gogain, Trinity College Dublin
Dr. Aodhán Ó Gogáin, from Trinity’s School of Natural Sciences, is the lead author of the study. He said: “Normally in fossil bone, we see that the internal original structure is preserved. But when we looked at the X-Ray images of fossils from Jarrow we see that no internal bone morphology has been preserved and that bones have been partially replaced by the surrounding coal.”Dr.
Dr. Aodhán Ó Gogáin added: “We have also been able to radiometrically date the apatite which shows it formed during a time when all the continents on Earth were coming together and colliding to form the supercontinent Pangaea. As these continents collided, they formed mountain belts with super-heated subterranean fluids flowing through them.
Trinity’s Dr. Patrick Wyse Jackson, another co-author said: “The Jarrow assemblage is of major scientific importance and is a significant element of Ireland’s geoheritage. It is great that finally the question of what altered the fossil bones of these animals has been resolved.” Reference: “Metamorphism as the cause of bone alteration in the Jarrow assemblage of Ireland” by Aodhán Ó Gogáin, Gary O’Sullivan, Thomas Clements, Brendan C. Hoare, John Murray and Patrick N. Wyse Jackson, 7 December 2022,
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