Magnetostratigraphy of the Lower Paleozoic Period Boundaries

地磁反射时间尺度现在是地球上 年代地层学中有用的、牢固确立的组成部分 相关性，至少比中侏罗世年轻。 超过 在过去的10年里，这一点已经得到了很大的扩展。 通过研究井的磁性地层学， 在多个重叠的剖面中的年代久远的含油气地层。 我们 建议在未来三年扩展现有的研究， 前寒武-寒武纪、寒武-奥陶纪、奥陶纪- 志留纪和志留纪-泥盆纪。 虽然长期目标 这些努力的目的是确定是否有可能 建立一个逐带的磁性地层学， 古生代，时期界限是合理的起点， 在生物地层学家的不懈努力下， 边界层型剖面 这些边界往往对应 到进化多样化和/或灭绝的时期， 而拟议工作的结果可能会立即发现， 在消光等时性测量中的应用， 全球气候事件，以及验证 碳同位素地层学

The Geomagnetic Reversal Time Scale is now one of the most useful and firmly established components of chronostratigraphic correlation, at least for times younger than mid-Jurassic. Over the past 10 years, significant extensions of this have been made to earlier times by studying the magnetostratigraphy of well- dated, fossiliferous strata in multiply-overlapping sections. We propose to extend our existing studies over the next 3 years to the Precambrian-Cambrian, Cambrian-Ordovician, Ordovician- Silurian, and the Silurian-Devonian. Although a long-range goal of these efforts is to determine whether or not it is possible to establish a zone-by-zone magnetostratigraphy for the entire Paleozoic, the period boundaries are logical places to start due to the intensive efforts of biostratigraphers searching for global boundary stratotype sections. These boundaries often correspond to times of great evolutionary diversification and/or extinction, and results from the proposed work could find immediate application in measuring the isochrony of extinction and proposed global climatic events, as well as verifying the utility of carbon-isotopic stratigraphy.