STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Fossil frog humerus. Coloured scanning electron micrograph (SEM) of the fossilised humerus of a frog from the oligocene era.The familiar frogs, toads, and salamanders have been present since at least the Jurassic Period. Magnification: x10 at 10cm wide.
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