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随着地层及古生物研究的不断深入,随着各种手段,如同位素、古地磁及痕量元素方法等在地层研究工作中的应用,国际上对地层的划分和对比的精度要求越来越高,系与系之间界线为研究也是各国地质学者重要的研究课题.利用“界线层型”方法已为大多数人所接受,就是在世界范围内寻找一个最理想为连续剖面及若干参考剖面,作为国际地层划分对比的标准.正如国际地层分类指南中所表示的那样.“一个年代地层单位的界线层型,应当从
With the deepening of stratigraphic and paleontological research, with the application of various means such as isotopes, palaeomagnetic and trace element methods in stratigraphic research, the precision of stratigraphic division and contrast is increasingly demanding , The boundary between lines and departments is also an important research topic for geologists all over the world.It is accepted by most people that using the method of “boundary line layer”, that is, looking for the most ideal continuous section and several reference sections in the world, As a standard for international stratigraphic comparisons, as indicated in the International Stratigraphic Classification Guidelines. "The boundary strata of a stratigraphic unit from one generation should