中文摘要：

通过分析江郎山两条峡谷岩壁地貌特征和谷底的纵剖面曲线特征，对比同一地区同类地貌成因，认为小弄峡是经流水侵蚀张节理而形成的裂谷，大弃峡则为断层谷．根据两奈峡谷谷底纵剖面上存在的两级岩槛和郎峰的两级侵蚀“阶地”，初步恢复了江郎山的抬升演化历史；同时认为具有区域性特征的抬升沟谷可能是记录区域地貌演化历史的重要地貌遗迹．

英文摘要：

Based on properties of palisades between the ＂Three-Sliced-Rock＂ of Jianglang Mr. , and comparing the Xiaonongxia Ravine with the local similar landforms, this paper suggested that the Xiaonongxia Ravine belongs to rift valley from tension joint. As there are lack of evidences about the long-term water erosion and markedly different surface properties of the cliff landforms of Danongxia Ravine, the paper proposed that the formation of the Danongxia Ravine be attributed to fault actions. Meanwhile, the article retrieved the evolution of the Mr. Jianglang which showed that the ＂Three-Sliced Rock＂ had undergone tectonic lifting twice relying upon the existing two orders of rock benches along the ravines.