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Scientists think it’s a sign there’s more ancient life to discover as the lake’s water levels recede.
But there, he saw it, embedded beneath a sandstone ledge — a footlong stone block, covered in what looked like brown stains. Milner, paleontologist and curator at the St. George Dinosaur Discovery Site at Johnson Farm, initially thought they were plant impressions, the fossilized remnants long since washed away.
According to the National Park Service, these tritylodont bones could help understand how the mammal relatives, and others, survived the mass extinction at the end of the Triassic Period and diversified through the Jurassic before going extinct themselves in the early Cretaceous — the beginning of the end of dinosaurs’ reign, which ushered in the rapid diversification of mammals and life as we know it.
However, further research showed that these creatures lacked mammals’ characteristic jaw joint between the mandible and temporal bones, part of the skull that contains the middle and inner ear, Sues said.
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