NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Archimedes bryozoan fossil. This is the spiral backbone of the bryozoan. Bryozoa are a phylum of aquatic invertebrate animal. This specimen was found in Lower Carboniferous limestone in Iowa, USA, and dates to 350-330 million years ago.
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