布伦赫斯、松山和高斯极性世的持续时间虽然知道得比较清楚,其界限分别为69万年、241万年和332万年,然而一些时间较短的极性事件的年龄界限还是不够明矾。至今,只有贾拉米洛事件的上限是根据已知地层中相反极性的火成岩的年代测定提出的,而其他事件的界限都是推断出来的。本文介绍印度洋西南留尼汪岛圣但尼河峡谷岩壁上出露的两个玄武岩系列的资灾,记录了上面和下面都是倒转极性熔岩的一个正极性时期。 Although the duration of the Braunhas, Matsuyama and Gossip polarities is well known, the boundaries are 6.9 million years, 2.41 million years and 3.32 million years respectively. However, the age limits of some short polar events are not enough alum. To date, only the upper limit of the Jalamilo incident is based on the dating of igneous rocks of opposite polarities in the known strata, while the boundaries of other events are inferred. This paper presents a series of two basalt episodes exposed on the rocky walls of the Saint-Denis Gorge in the Southwestern Reunion, in the Indian Ocean. It records a positive polarity period above and below the inverted polar lava.