Bolma modesta 塔星螺


稜柱層 Ostracum, Prismatic layer


真珠層 Hypostracum, Pearl layer


真珠層2 Hypostracum, Pearl layer 2


真珠層3 Hypostracum, Pearl layer 3


稜柱層與真珠層交界 Ostracum and Hypostracum

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