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Paleontological fossils

Trilobite fossil

Trilobes are arthropods of the phylum Arthropoda trilobes. The body is divided into three parts: head, chest and abdomen. There is a carapace on the back, and the carapace is divided into three longitudinal parts. The head is covered with a hard shell, called the cephalic nail; the central raised part of the cephalic nail is called the head saddle, and the shape and size of the head saddle vary greatly according to the type; the front of the head saddle is the head cap with eyes on it; the abdomen and tail are also wrapped in carapace. It is named for the longitudinal division of the carapace on the back into three pieces.

Cretaceous chrysanthemum fossils

The ammonites are 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.