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东秦岭二郎坪群和石界河群之间发现了一条强应变带（称之为回龙湾强应变带），呈ＮＮＷ—ＳＳＥ向延伸，面理置换强烈，韧性剪切变形特征明显，糜棱岩发育。该强应变带的发现表明，二郎坪群和石界河群之间既非不整合接触，也不是整合接触，而是断层接触关系。结合原岩建造、沉积环境和变质作用特征，作者认为二郎坪群和石界河群之间并非简单的地层学上的上下关系，而是两个近乎同时异地的变质地质体。
A strong strain zone (known as the Huilongwan strong strain zone) was found between Erlangping Group and Shijiehe Group in the East Qinling Mountains. It extends in the NNW-SSE direction with intense face replacement and obvious ductile shear deformation. The mylonite development. The discovery of this strong strain zone shows that there is neither unconformity nor integration but the fault contact between Erlangping Group and Shijiehe Group. Based on the characteristics of original rock formation, sedimentary environment and metamorphism, the author thinks that the Erlangping Group and Shijiehe Group are not simple stratigraphic up-and-down relationship, but two metamorphic geologic bodies that are almost the same time and different places.