Fossil Ammonite - Specimen - 121×96×28 mm

Scientific name "conch" fossils "ammonite", is a kind of Marine fossils, ammonites belongs to mollusks door, first class, is 400 million years ago on the devonian is separated from the Angle of stone animals, jisheng period is a Mesozoic era, so the Mesozoic is regarded as "ammonite era". With the end of the Mesozoic era, ammonites disappear on the earth. "Conch" fossils from about 400 million years ago the infant wu screw eyes evolved, only one over one hundred thousand chance of biological fossils on earth, where there is little chance of fossils of jade. Conch fossils are fossils first, and then be jade, eventually forming a rare gems.