STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Reptile jaw fossil. Coloured scanning electron micrograph (SEM) of part of a fossilised jaw from an extinct reptile that lived during the Permian period (250-300 nmillion years ago). Its remains are known from North America,. Magnification: X 25 when printed 10cm wide.
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