论文部分内容阅读
One hundred and seventeen oriented specimens of loess(in the form of cubes with an edgeof 4 cm)were collected from the Wucheng loess section in Xixian County,Shanxi Province.After magnetic cleaning in an alternating field the remanent magnetization of specimens wasmeasured with an astatic magnetometer(sensitivity 4×10~(-8)emu/cm~3).The normally magnetized zone of the Brunhes normal epoch is recorded in upper PleistoceneMalan loess and middle Pleistocene Lishi loess which contain typical Zhoukoudian fauna.The reversely magnetized zone of the Matuyama reversed epoch is observed in lower Pleisto-cene Wucheng loess,whose fossils are found corresponding to Villafranchian Nihowan fauna.
One hundred and seventeen oriented specimens of loess (in the form of cubes with an edge of 4 cm) were collected from the Wucheng loess section in Xixian County, Shanxi Province. After magnetic cleaning in an alternating field the remanent magnetization of specimens wasmeasured with an astatic The normally magnetized zone of the Brunches normal epoch is recorded in upper Pleistocene Marlinson and middle Pleistocene Lishi loess which contains typical Zhoukoudian fauna. The reversely magnetized zone of the Matuyama reversed epoch is observed in lower Pleisto-cene Wucheng loess, whose fossils are found corresponding to Villafranchian Nihowan fauna.