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1969年考克斯(Cox)根据世界各地一些火山熔岩样品的古地磁学研究资料以及相应岩层的同位素年龄资料,编制了450万年以来的地磁极性年表.他把450万年以来的地质时期分为正、反向磁极性交替变化的四个极性世(布伦赫斯正极性世、松山反极性世、高斯正极性世和吉尔伯特反极性世),又确定了其中的9个极性事件在地磁极性年表中的位置.地质学家们把这个地磁极性年表作为第四纪地层划分和对比的依据.尽管各国地质学家对于第四纪与第三纪的分界线究竞是放在186万年或者是置于243万年等等的意见尚不一致,但是现有的几种
In 1969, Cox compiled geomagnetic polarity chronology for 4.5 million years based on paleomagnetic data from volcanic lava samples from various parts of the world and the isotopic ages of the corresponding strata. The period is divided into four polar genera (alternating positive and negative Poisson’s, Matsuyama anti-polar, Gaussian polar and Gilbert anti-polar) with alternating positive and negative polarities. Of the nine polar events in geomagnetic polar chronology.The geologists use this geomagnetic polar chronology as the basis for the division and contrast of Quaternary strata.Although geologists of all countries have made great efforts in the Quaternary and Third It is not clear from the point of view that the boundaries of JIU should be put at 1.68 million years or at 2.43 million years. However, the existing ones