Researchers from the Universitat Autònoma de Barcelona (UAB), the Miquel Crusafont Catalan Institute of Palaeontology (ICP), and the Jaume Almera Institute of Earth Sciences (CSIC), working in the Manyanet Valley (Pallars Jussà, Lleida), have identified various tracks made by tetrapod animals between 280 and 290 million years ago, which makes them the most ancient fossil footprints in Catalonia. They correspond to different groups of primitive reptiles and amphibians, among which are synapsids, the group that would later give rise to the mammals.

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