袁金良等(2012)最近为华北的寒武系建立年代地层新单位长清阶和济南阶,用以取代与岩石地层单位重名的张夏阶和崮山阶。然而,这两个新建的阶也同样与岩石地层单位重名,是两个无效的地层单位名称。笔者建议今后在建立正式地层单位时,命名者应充分查阅已有的地层名称记录,避免重名。 Recently, Yuan Jinliang et al. (2012) recently established the Changqing and Jinan strata, the new generation units of the Cambrian system in North China, to replace the Zhang Xia stage and the 崮 mountain level, which have the same names as the lithostratigraphic units. However, these two newly-created orders are also given the same names as lithostratigraphic units and are two invalid names of strata. The author suggests that in the future in the establishment of formal units, the naming should fully review the existing formation name records, to avoid duplication.