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唐山寒武 /奥陶系界线的磁极性序列研究表明 ,早奥陶世Tremadoc阶为一混合极性期 ,中奥陶世可能存在一较长时间的反极性期 .这一结果同时再次证明了华北地块在早 /中奥陶世处于赤道以南中、低纬度带内
The magnetic polarity sequence of the Cambrian / Ordovician boundary in Tangshan shows that the Tremadoc order of the Early Ordovician is a mixed polar period, and the period of reverse polarity of the Middle Ordovician may exist for a long time. This result is proved again The North China block in the early / Middle Ordovician in the equator in the low latitude zone