(Phys.org)—A team of researchers working at a dig site in Scotland has found tetrapod fossils dated to approximately 15 million years after the Devonian mass extinction—a time period experts in the field have referred to as “the gap,” because so few fossils of creatures from that time period have been found. In their paper published in the journal Nature Ecology & Evolution, the team describes the fossils they uncovered and outline their place in the evolution of animal life on our planet.