JOHN SIBBICK / SCIENCE PHOTO LIBRARY JOHN SIBBICK / SCIENCE PHOTO LIBRARY
Dinosaur fossil discovery and reconstruction. Illustration of the stages of research involved in the discovery, study and reconstruction of a dinosaur fossil, in this case the theropod dinosaur Dilophosaurus (from the Jurassic around 193 million years ago). At upper left, a palaeontologist is excavating the fossil from the layers of sedimentary rock (top left) in which it formed. The tools used are shown down left, with the parts of the fossil carefully labelled (numbers). The smallest parts are examined with a microscope (inset at bottom left). The anatomy is described in the notes and research at centre right, with the final reconstructed dinosaur shown at upper right.
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