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金沙江巧家段河谷广泛发育厚层黄土状堆积，尤以金沙江左岸宁南县华弹一带最为发育。其厚度较大而层理又不明显，且多钙质结核，通过对七条黄土状堆积的地层剖面作磁性地层研究和热释光测年，确定该黄土状堆积的时代属布容正向极性时晚期，其地质时代为晚更新世－全新世。
Jinshajiang Qiaojiagou valley extensive development of thick layer of loess-like accumulation, especially on the left bank of Jinsha Ninghua Hualan area most developed. Its thickness is thick and the bedding is not obvious. The calcareous nodules of the calcareous nodules are studied by magnetic stratigraphy and thermoluminescence dating of seven loess-like strata. In late sexual period, the geological age is late Pleistocene - Holocene.