Yichang Limestone Quarry

2011727deposited about 220 million years ago, the late triassic guanling fossil group in guanling county, sw guizhou province, china, preserves a diverse assemblage of vertebrate and invertebrate fossils in black mudstone and shale of the upper lower member of the xiaowa formation early carnianhese rocks are exposed over 200 km2, and contain numerous wellpreserved marine reptiles.

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