SOME FUNDAMENTAL PROBLEMS OF QUATERNARY GEOLOGY OF EASTERN HEBEI PLAIN
Yang Zigeng (Hebei Geologic College) Li Youjun Ding Qiuling He Baocheng (Geologic Team 7 of Hebei Geologic Bureau)
In the eastern Hebei plain Quaternary deposits of about 600 and 300 meters occur respectively in downwarped and upwarped areas. The beginning of the Quaternary is taken at 3 millions years before present corresponding to that of geomagnetic Mammoth event. During the Quaternary period, according to climatic indications, five glacial and four interglacial climatic stages can be differentiated. Inthis part there are also discovered seven marine ingressions, taking place either in interglacial or mid-glacial and post-glacial stages. The Holocene can be subdivided into early, middle and late stages, among which the middle one the warmest. A short cooling stage was found to have taken place about 5000 years before present.