Indentations in sandstone, leftover from a massive, extinct amphibian, reveal a style of swimming still found today.
A large rhinesuchid temnospondyl amphibian leaves behind an impression. A mat composed of microbes may have preserved a series of 255-million-year-old indentations made in a sandy South African tidal bottom by a hulking amphibian,The remarkable shapes reveal that the nearly 2-meter-long rhinesuchid temnospondyl lurked for its prey and swam after it in the fashion of a crocodile.
While researchers have studied the Dave Green site before, this team brought drones to take photographs from 10 meters high, and handheld 3D scanners, to render the rare indentations. Researchers have tried in the past to make plaster casts of the long, shallow forms and failed. Then when it swam across the bottom, it did so with a writhing, sinusoidal movement that left a narrow path in the sand.
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