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从不列颠哥伦比亚东南普赛尔(Purcell)山脉的纳尔逊山(Mount Nelson)组(普赛尔超群顶部)所采的92块化学退磁和热退磁标本,具有二组明显的定向群。发现于热退磁和化学退磁期间的MN—A方向,具D=274°,I=19°(a95=10°,已倾斜校正)的平均方向,这与156°E,1O°N的磁极位置相符。MN—A存在于细粒亦铁矿中,并具与国立冰川公园一克拉克山脉地区的贝尔特-普赛尔(Belt—Purell)超群中上部所报道的其它
Of the 92 chemical demagnetization and thermal demagnetization specimens collected from the Mount Nelson Formation (Purcell Grande Top) in the Purcell Mountains of British Columbia, there are two distinct groups of orientations. It was found that the MN-A direction during thermal demagnetization and chemical demagnetization has an average direction of D = 274 °, I = 19 ° (a95 = 10 °, tilt corrected), which is consistent with the magnetic pole position of 156 ° E, 10 ° N Match. MN-A is present in fine-grained iron ore and is consistent with the other reported in the upper Belt-Purell superior of the National Glacier Park-Clarke Range