DescriptionFossiliferous peloidal phosphorite, Yunnan Province China.jpg
This comes from just south of Ercaicun, ~4 km WSW of Haikou, Kunming City Prefecture, east-central Yunnan Province, southwestern China. This rock was deposited not long after the Cambrian Explosion (the sudden, evolutionary appearance of abundant fossil life near the Precambrian-Cambrian boundary).
On a global scale, phosphorite deposition was at its maximum, volumetrically, during the Neoproterozoic and Cambrian.
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