论文部分内容阅读
本文记述了东濮凹陷早第三纪沙河街组四至三段以轮藻、介形类为主的生物群面貌及其在国内外的分布情况,并较详细地讨论了沙河街组四段下部轮藻化石种 Obt-usochara jianglingensis,Gyrogona qianjiangica 与介形类化石 Cyprinotus igneus 共生为特征,可与南阳盆地中始新世大仓房组的生物群相对比;沙河街组四段上部至三段的具反迭覆的介形虫化石优势种 Cyprinotus altilis 的类型,在南阳盆地核桃园组三至二段也十分繁盛,两者亦可进行对比。另外,对地质时代富有指示性的植物化石和鱼化石 Palibinia pinnatifida,P.latifolia,P.korowinii,和 Knignlia sp.分别与沙河街组四段上部和三段的标志性介形类化石 Austrocypris levis,Huabeinia chinensis共生,其时代为晚始新世为宜。
This paper describes the appearance and distribution of biota at Chahejie Formation in the 4th and 3rd member of Shahejie Formation in Dongpu sag and its distribution both at home and abroad. The lower part of the fourth member of Shahejie formation is discussed in detail The Chaetoceros fossil species Obt-usochara jianglingensis and Gyrogona qianjiangica are characterized by symbiosis with the Mesotypic fossil Cyprinotus igneus, which can be compared with the biota of the Middle Eocene and the Dacangafang Formation in the Nanyang Basin. The type of Cyprinotus altilis, which is the reverse-covered ostracod fossil, is also very prosperous in the third to the second sections of the Nanyang Basin Hetaoyuan Formation, and the two can be compared. In addition, Palibinia pinnatifida, P.latifolia, P. korowinii, and Knignlia sp., Which are indicative of phytogeny and fish fossils in the geological age, are respectively associated with the Austrocypris levis, Huabeinia chinensis symbiosis, its age is late Eocene appropriate.