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Abundant perfectly-preserved phosphatic microspherules have been discovered across the Frasnian-Famennian (F-F) transition from the Yangdi section in Guilin, Guangxi, South China. They are mostly spherical or elliptical in shape and about 150 μm in diameter with smooth exterior surfaces. Each microspherule consistently possesses a small dimple on the surface. The internal texture of microspherules...
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