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Type and grade of biostratigraphic units

Release date:2017-07-26  Browse times:1580
     生物带是生物地层带的简称,它是任何一种生物地层单位的统称。生物地层划分可采用不同生物特征(如以全部化石或某类化石的组合特征、共生情况、延续范围、富集程度、形态特征等)为根据。因此,有含义和内容很不相同的多种生物带。为指明生物带的种类,对每种生物带应有不同的、专用的和定义完善的术语。经常使用的生物带有五种,即延限带、间隔带、谱系带、组合带和富集带。他们之间不存在从属关系,也不相互排斥,更不是代表生物地层单位的不同等级。例如,延限带不应该划分成组合带,反之亦然。然而某些种类生物带(如组合带)可再细分为亚带,或将有共同生物地层特征的几个生物带组成一个超带。因此,生物亚带、生物带和生物超带成为生物地层单位的一种等级。此外,一个种的延限带附属于它隶属的属延限带,这是生物分类等级含义已延至生物地层单位上的结果,不再需要一个生物带的等级术语。

 
 
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