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华北平原基本上与一般所称的渤海湾盆地(地区)相当,通过二十余年来的油、气勘探,平原内部下第三系的发育情况尙称清楚。原来建立的各岩石地层单位——组,基本上已为人们所公认并加以广泛使用。实际上,在进行岩石地层工作的同时,对其中所含的各类化石,均进行过鉴定和分析,各组所含有的化石组合也大致清楚。尽管多年来在习惯上按区域构造单位划分,将华北平原大体上分为济阳、黄骅、下辽、渤海、冀中、临清等几个地域,而各地域下第三系的岩层发育及所含的化石组合不仅都有一定的
The North China Plain is basically equivalent to the so-called Bohai Bay Basin (region). After more than 20 years of oil and gas exploration, the development of the Lower Tertiary within the plains has been clearly stated. The originally established units of rock strata - basically have been recognized and widely used by people. In fact, while carrying out rock formation work, all kinds of fossils contained therein have been identified and analyzed. The fossil assemblages in each group are also generally clear. Although the habitat has been divided according to regional structural units for many years, the North China Plain can be roughly divided into several areas, namely, Jiyang, Huanghua, Xialiao, Bohai, Jizhong, Linqing and so on. However, Contained in the fossil combination not only have certain