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Ammonite bite marks

Round holes preserved on some ammonite shells were once hypothesized to be a result of limpets attaching themselves to the ammonite’s shell. A recent study by Dr. Takuya Konishi suggests a strong possibility that the impressions are instead tooth marks from giant marine reptile mosasaurs preying upon ammonites.

Place your cursor over the image to see notes about the three features of this ammonite.

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Taken on February 16, 2010