测定岩石或沉积物样本年龄的科学；地质年代学。
geochronologies — plural of geochronology
测定岩石或沉积物样本年龄的科学；地质年代学。
测定岩石或沉积物样本年龄的科学；地质年代学。
The science of dating samples of rock or sediment.
确定不同岩石样本年龄的任意一种方法。
Any one of the methods by which the age of different samples of rock can be determined.
将古代时间划分为有名称的分期/时期。
The division of ancient time into named subdivisions / periods
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