标准化石 meaning in Chinese

index fossil; guide fossil

Thus any rock found bearing these index fossils can be dated fairly accurately as belonging to their proper period in history .
因此凡是发现含有这类标准化石的岩石就可以相当精确地断定它们在地质史上属于某个相应时代。
In the fairly deep lake facies there found abundant bivalve fossils , such as the standard foss il of permian in north xingjiang - tarfaniasp . ,
半深湖相中发现丰富的瓣鳃类动物化石，如北疆地区二叠系标准化石?吐鲁番鳕鱼及介形类等。