boettgeri ). As they explain, “the mats quickly cover the bodies in just thirty days, forming a kind of sarcophagus that protects and isolates the frogs from the outside. In this way, the bodies are not dismembered or fragmented and can maintain their integrity. The delay in decomposition inside the sarcophagus allows conservation even at the cellular level, as can be observed by electron microscopy in samples of skin, tendons, muscle and bone marrow ”. According to the authors, these results also connect directly with the fossil record. They point out, for example, that the cuts of the bones of the frogs from the experiments present a series of cells and tissues that surprisingly coincide with those of fossils of adult frogs and tadpoles from the Spanish

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site of Libros (Teruel) from 10 million years ago. of years. “These experiments, therefore, allow us to better understand the conditions in which those fossils could have formed”, details Anabel López-Archilla, researcher at the Microbial Ecology Laboratory of the UAM. Not all parts of the body fossilize the same Another important aspect Namibia WhatsApp Number List highlighted in the article is that frog fossilization does not occur in a homogeneous way, that is, it does not happen in all tissues in the same way. This phenomenon had been previously observed in some fossils, which has generated a wide debate and produced different hypotheses for its explanation. However, the work shows for the first time, in an experimental way, how it could happen. When analyzing the interior

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of the preserved skull of the frogs, the researchers observed that a certain region of the brain, the optic lobe in particular, in addition to being preserved, had begun to mineralize, that is, to change its original organic composition by minerals. The researchers argue that this transformation would allow its conservation for millions of years. “These results can explain some aspects of the fossils found in the Libros site, but also much older fossils such as those of Las Hoyas (Cuenca), which date from the Cretaceous and are around 120 million years old”, explains Miguel Iniesto , researcher at the University of Burgundy and also author of the work. Ángela Delgado, from the UAM Paleontology Laboratory, co-author and principal investigator of the

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