二连盆地丰富的哺乳动物化石遗存清晰地显示出这里保留了古新世-始新世高热增温事件和始新世-渐新世"温室"转"冰室"效应等重大生态环境变化记录。然而，受上述事件影响的陆相动物群种类重组与海相环境变化记录目前存在很多年代学争论；是否受到全球性构造活动或古地理变化影响也未得到确认。 项目设计将在二连盆地开展全面的磁性地层学和环境磁学工作。通过对古近纪地层代表性剖面的高分辨率年代测定，准确限定多处化石层年代，建立华北古新世-始新世陆相标准地层。对磁性矿物组合变化及磁性晶粒尺寸变化的研究将有助于解译该沉积地层千年到百万年尺度的气候和环境变化及其对哺乳动物群演替产生的影响；揭示地层环境的变化境况和重大生态时间发生的特征，为古/始界线附近生物及环境演变的海陆对比研究提供新依据。还将通过构造古地磁手段进行古近纪时期的古地理重建和造山作用过程的恢复，寻找存在于构造活动与环境变化和生物巨变之间的纽带。

The Erlian basin of Inner Mongolia preserves Early Paleogene strata and mammal fossils assignable to the remarkable Paleocene-Eocene Thermal Maximum(PETM) and the dramatic decrease of temperature from "greenhouse" to "icehouse" conditions occurred across the Eocene-Oligocene boundary . It's been a debate on the time of lag between the global (marine) warming/cooling transitions and the terrestrial biotic reorgnization. We propose to measure the magnetostratigraphic sections and analyzed the environmental magnetism of the strata, through high-resolution and high-precision dating in the representative sections calibrating the mammalian fauna sequence within a chronostratigraphic framework, constrain the time of fossil horizons in the basin and established the Paleocene - Eocene continental standard stratigraphy in northern China. We are also trying to study the variations in magnetic mineral assemblages and grain size of magnetic particles which reflect climatic and environmental changes during deposition in the continental sedimentary realms on a scale of thousands years, revealing formation environment changes the situation and major ecological time feature for the Paleocene / Eocene boundary in biological and environmental evolution of the land and sea comparative study provides a new basis. There is still considerable lack of paleomagnetic studies to provide plate tectonic reconstructions in the studied areas. Paleogeographical reconstruction will enable us find the missing link between the tectonic activity, environmental change and biotic reorganization.