东秦岭北坡下寒武统三川组,在洛南石门—潘河断层以南近东西延伸。近年来,陆续在其中采到三叶虫(Bergeroniellus sp.)等化石,故主张三川组与石门以北的下寒武统辛集组相当的人越来越多。在中朝准地台西南缘,辛集组是北方重要的含磷层位。但是 The Lower Cambrian Sanchuan Formation on the northern slope of the East Qinling Mountains extends east and west of the Shihmen-Panhe fault in Luonan. In recent years, fossils such as the trilobite (Bergeroniellus sp.) Have been taken one after another, so more and more people advocate that the Sanchuan group is equivalent to the Lower Cambrian Xinji group north of Shimen. On the southwestern margin of China-North Korea Platform, Xinji Formation is an important phosphate-bearing layer in the north. but