ammonite fossil
The ammonite is an extinct marine mollusk belonging to the cephalopod family. They lived on Earth during the Mesozoic period, about 0.25 billion to 65 million years ago, and were mainly distributed in the oceans. The shape of the ammonite resembles a spiral flat disc, consisting of a series of spiral chambers. Their shells are usually made of calcareous matter and can be preserved as fossils. The size range of ammonites is large, from tiny species with only a few millimeters to giant species with a diameter of more than 2 meters.
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