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过去人们曾把变质程度最深的迁西群上川组作为冀东也是华北最老的地层。但近年来,多数同位素年龄的数据都表明,主要出露在太平寨和郭家沟
In the past, people have the deepest metamorphosis of Qianxi group Shangchuan group as the eastern part of Hebei is the oldest strata. However, in recent years, most of the isotope age data show that the main exposure in Taipingzhai and Guojiagou