通过河南邙岭塬北缘中部 ,孟津扣马黄土剖面野外观测及室内磁化率研究 ,剖面共发育 1 1层 (S1～ 11)以上黄土 -古土壤序列 ,各层古土壤清晰 ;但第二层 (S2 )的磁化率值相对较低 ,而且与第三层 (S3 )间所夹黄土层非常薄 ,显示异常特征。古地磁测试结果揭示 ,B M界限在深度 3 8 9m处 ,位于L8的底部。松山负极性时晚期 ,记录了两段正极性。 Through the field observation and the magnetic susceptibility study of the Mazu soil profile in the middle margin of the northern margin of the Yanglingyuan Plateau in Henan Province and the study on the magnetic susceptibility of the Ma Loess section, a total of 11 loess-paleosol sequences were developed in the section, and the paleosol was clear in all layers. However, (S2) is relatively low, and the loess layer sandwiched between it and the third layer (S3) is very thin and shows abnormal features. Paleomagnetism test results revealed that the B M bound was at the depth of 389 m and was located at the bottom of L8. Matsuyama negative late, recorded two positive.