Paleontologists in Arizona have identified microfossils of what are thought to be the oldest known frog relative in North America. A Chinle frog, inside the jaw of a phitosaur. Image credit: Andrey Atuchin. The newly-discovered microfossils represent the first known and earliest equatorial remains of a salientian — the group containing living frogs and their most-closely related fossil relatives — from the Late Triassic, roughly 216 million...
