MARK A. SCHNEIDER / SCIENCE PHOTO LIBRARY MARK A. SCHNEIDER / SCIENCE PHOTO LIBRARY
Fossil snail (Loxoplocus bowdeni). This is the fossilized shell of a gastropod mollusc. Gastropods have a muscular foot and a shell that is usually coiled in structure. This gastropod lived during the Ordovician Period, 490-440 million years ago. Found in Kentucky, USA.
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