DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Fossilised Chirotherium footprints. Chirotherium (Ichnium Sphaerodactylum) was a four-footed, 3 metre-long reptile that lived around 200 million years ago. A skeleton of the extinct animal has never been found; everything we know about it has been deduced from fossilised footprints. The footprints are on the underside of this slab, so show the animals soles as though from below. The long, rope-like shapes are the tracks of worms or other organisms that burrowed under the sediment surface. The sample measures 450 millimetres across.
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