北京延庆第四纪盆地杨户庄剖面新信息——有孔虫与海相介形虫新发现

NEW INFORMATION OF THE YANGHUZHUANG SECTION IN THE QUATERNARY YANQING BASIN, BEIJING——Discovery of Quaternary Foraminifers and Marine Ostracods

文中报道了在北京延庆杨户庄剖面,发现的第四纪有孔虫与海相介形虫化石。该化石产地以化石层位稳定、分布面积较广、化石丰富及地质时代较明确为特点。至于化石是否是“海侵”或“海泛”的产物?,或是由“生物传布的空中通道”而来,还是为“湖盆内盐度增高的水介质中生存的特殊生物相”?都正在研究与探讨之中。

Foraminifers and marine ostracods were discovered in the Yanghuzhuang section of the Yan-qing basin. They are mainly Evolutononion shanxiense Wang, Sinocytheridea impressa (Brady) etc. These fossils are very abundant in the Yanghuzhang section and widely distributed in Early Pleistocene strata of the Yuncheng basin of Shanxi Province, the Nihewan basin of Hebei province and the Beijing plain.On the basis of an analysis of the fossil composition, stratigraphy, magnetostratigraphy and sea transgression, the authors consider that the Yanghuzhuang section yielding foraminifers and marine ostracods may be correlated with the Early Pleistocene transgressive horizon in the Beijing plain and the Nihewan basin.