Petal-shaped shark teeth dating back 290 million years were first found in China.
Qianshi limestone in Yangquan City, north China’s coal-rich Shanxi Province / well-preserved petalodus teeth Studies in the samples have shown that the petal-shaped teeth have a crown that looks like a snout and has a long, tongue-shaped root. Shark petal-shaped teeth or petalodus teeth about 360-250 million / 360 million and 250 million yeras ago…