Xishancun Formation

The Xishancun Formation is a geological formation located at Qujing, Yunnan, South China. Xishancun Formation has remains of petalichthyid and galeaspid fish and it represents the Early Devonian period (Early Lochkovian) of China.

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    The moral virtues, then, are produced in us neither by nature nor against nature. Nature, indeed, prepares in us the ground for their reception, but their complete formation is the product of habit.
    Aristotle (384–322 B.C.)