Study on Quaternary Stratigraphic Division on Hebei Plain

Based on the past tested datum,such as carbon-14 age and paleomagnetism quantitative datum,integrating with the sediments color,lithology,structure,sedimentary rhythm and sedimentary cycles,marker bed included ancient soil,peat bed and leached horizon and so on,applying stratigraphy,biostratigraphy and climate stratigraphy and other means,728 holes are analyzed and according to Guide of China Stratigraphy,Quaternary stratigraphies of Hebei Plain have been preliminary revised.Taking 2.58 Ma as the lower boundary of the Quaternary,0.78 Ma as the lower boundary of the Middle Pleistocene,0.128 Ma,about equation the fifth stage of deep-sea oxygen isotope origination,as the lower boundary of the upper pleistocene,0.01 Ma,about equation the first stage of deep-sea oxygen isotope origination,as the lower boundary of the holocene series.The thickness of the Quaternary of Hebei Plain reduces 40~220 m after revised.It is the classification for the Quaternary stratigraphies of Hebei Plain study to build a platform for the aquifer structure model of the North China Plain.Due to lack of some palaeomagnetic datum in some individual small areas of the plain,the accuracy of the Quaternary lower boundary,the subdivision of the Quaternary and the regional top-level are effected.