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Definition and nature of biostratigraphic units

Release date:2017-07-26  Browse times:1526
        生物地层单位是根据其所含化石来定义和说明其特征的地层体。

 生物地层单位是一个客观实体,其识别与划分的依据是岩石层中可见的那些特定的可鉴别的生物化石。地球上不含化石的岩石(地层)体就不属生物地层范畴。从整体上看,生物化石显示了随地质时间推移的进化演变,这种演变在地层记录中是不重复的,因而生物地层单位就具有相对地质年龄的价值。有多种生物地层单位,在不同种类的生物地层单位间或以不同类别的化石所建的同一种类的生物地层单位间,沿纵向和横向方面经常有重叠、间断或交叉。生物地层单位依赖于生物分类方案,分类方案的变更还可使代表生物地层单位的地层体范围扩大或缩小。

 
 
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