This is called clam fossil in China.It grew in sea 5-6 hundred of million years ,there were a lot of kinds of clam and they are good at swimming , some of them stayed in seabed ,some of them hid in the silt of sea .It already became extinct completely two hundred of million years ago . The forest was eroded by flood ,and then was buried by mud ,sand and volcanic ash. With the long- time geological changes, the clam was filled and substituded by all kinds of mineral, then become the fossil of today. It is a rare chance for the fossil collectors.
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