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BEIJING, Aug. 28 (Xinhua) The fossil of a type of shark with petal-shaped teeth, which dates back to 290 million years ago, has been found in China for the f

United statesActa geologica sinicaBai zhijunLin xianghongGai zhikunInstitute of vertebrate paleontologyNatural resources bureau of yangquan cityChinese academy of sciencesYangquan cityActa geologicaVertebrate paleontologyChinese academyNatural resources bureauThe sharkHaped teethMillion years