1. 黄土钙质结核的形成以成土作用为主，剖面下部钙质结核可能是由成土和地下水淀积作用综合而形成的。
Most of the calcareous concretions in the loess strata were formed by pedogenesis, where as the same in the substrata of loess profiles could be commonly formed by the illuviation of ground water and the pedogenesis.