The reality of GSSPs
The reality of GSSPs
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发表时间：
2013-07
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通讯作者：
S. Finney
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作者：
S. Finney
认为年代地层单位和地质年代单位是不必要的和混乱的建议是基于对GSSP的错误概念。每个GSSP代表一个特定的时间点，两个连续的GSSP标志着一个时间间隔的开始和结束，这是一个地质年代单位。但是，认为这个时间单位可以用来确定相应的年代地层单位的假设是错误的。首先，早在地球同步带出现之前100多年，就已经有了年代地层单位和地质年代单位。历史年代地层单位是大部分地质年代表的基础，它们是根据不同的地层序列定义的，沉积的时间是相应的地质年代单位。建立GSSP的目的是确定确定年代地层单位基准的具体地层级别，并解决后来发现连续地层单位之间的间隙和重叠时的问题。不幸的是，用于特定边界的GSSP通常仅作为该边界位于层型剖面中的单一地层信号来呈现。然而，实际上，当与边界间隔中的其他地层信号的分布相比时，它仅对年代地层对比有意义。关键词：GSSP，年代地层学，地质年代学
The proposal that chronostratigraphic and geochronologic units are un-necessary and confusing is based on a mistaken concept of GSSPs. Each GSSP does represent a specific point in time, and two successive GSSPs do mark the beginning and end of an interval of time that is a geochronologic unit. But the supposition that this unit in time then serves to define a corresponding chronostratigraphic unit is mistaken. First, there were chronostratigraphic units and geochronologic units more than 100 years before there were GSSPs. The historical chronostratigraphic units that are the basis for much of the Geological Time Scale were defined on distinctive stratigraphic successions, and the time during which it was deposited is the corresponding geochronologic unit. GSSPs were established to identify specific stratigraphic levels that define the bases of the chronostratigraphic units and to resolve the problems when gaps and overlaps between successive units were later discovered. Unfortunately, the GSSP for a specific boundary is too often presented only as the single stratigraphic signal at which the boundary is placed in the stratotype section. Yet, in reality it only has significance for chronostratigraphic correlation when compared to the distribution of other stratigraphic signals in the boundary interval. Keywords: GSSP, chronostratigraphy, geochronology