年代地层单位

自从采用多重地层分类原则后，我国地层学者提出了许多新的二叠纪年代地层单位。

Since the principle of multiple stratigraphic classification has been widely accepted by Chinese stratigraphers , various new Permian chronostratigraphic units have been proposed in China , and thus need to be redefined urgently .

非正式年代地层单位来源于不同层位的地下水相互混合。

Informal chronostratigraphic unit Ground waters originating in different beds commingle .

中国奥陶系和下志留统下部年代地层单位的划分

Stratum Ordovician to the lowest Silurian chronostratigraphic subdivision in China

年代地层单位属中更新统。

It is middle Pleistocene in age .

2002年修订的最新版本《国际地层表》反映了当前国际上年代地层单位研究的最新进展。

Newly edition of International Stratigraphic Scale revised in 2002 reflects recent developments of the study on stratigraphic units .

相邻钻孔之间地层的连接关系可分为基于年代地层单位的时序地层关系和基于地层属性的岩性地层关系两种；地层属性及其语义关系是岩性地层关系判断和细节地层连接的基础。

The connecting relations of strata between adjacent boreholes include stratum-sequence-based and stratum-semantic-based relation , and the stratum attributes as well as its semantic relations is the foundation of the judgment of stratum-semantic relation and the detailed strata connection .

为了客观反应我国奥陶系的特点，同时便于与全球年代地层单位界线对比，建议将上述各个阶底界的的界线依次划在R。

In order to reflect the regional characteristics of the Ordovician of China and also to be easy to correlate with the global Ordovician boundaries of series and stages , the bases of 6 stages mentioned above are successively fixed at the base of the R.