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华北平原各省市第四系下限、内分层时限皆不相同,使相关研究缺乏统一的语言。依照《中国地层指南》的规定,据现有材料对华北平原第四系划分进行了再研究,明确河北平原原定早更新世固安组属于上新统,由于石油系统同样执行《中国地层指南》的原则,则固安组是明化镇组的同义名,应废弃。现有工作显示华北平原N/Q界线没有超过500m。
The lower limit of the Quaternary system in all provinces and cities of the North China Plain and the time limits within the stratification are all different, making the related research lacks a unified language. According to the “Guide to Stratigraphy of China”, according to the available materials, the Quaternary Division of the North China Plain has been further studied. It is clarified that the Gu’an Formation belonging to the Pliocene was originally determined to be Early Pleistocene in the Hebei Plain. Since the petroleum system also implements the “ ”Principle, Gu’an group Minghua town group synonymous, should be abandoned. The existing work shows that the North China Plain N / Q line does not exceed 500m.