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近十多年来,我国在南海北部开展了大面积的石油普查勘探工作,先后发现了北部湾、莺歌海和珠江口盆地,并在这三个盆地中相继见到了工业性油流。随着南海石油勘探工作向前发展,有许多地质问题需要我们去认识和探讨。本文根据目前现有资料,论述南海北部“三层式”大型有孔虫肾鳞虫(Nephrolepidina)的绝灭层位和上新统与中新统的界线问题。 一、肾鳞虫的分布与绝灭 肾鳞虫Nephrolepidina是在1911年由Douville建立,它以第二胚室为肾形而得其名,以此从鳞环虫Lepidocyclina届中分出。它的轴切面可分为三部分:中间为赤道壳
In the past decade or so, China has conducted a large-scale oil census and exploration work in the northern part of the South China Sea. The Beibu Bay, Yinggehai and Pearl River Mouth Basin have been discovered one after another, and industrial oil flow has been seen successively in the three basins. With the development of oil exploration in the South China Sea, there are many geological problems that we need to understand and discuss. Based on the current available data, this paper discusses the extinction strata of the “three-layer” Nephrolepidina in the northern part of the South China Sea and the boundary between the Pliocene and the Miocene. First, the distribution and extinction of kidney scale Nephrolepidina Nephrolepidina was established in 1911 by the Douville, it is the second embryo kidney-shaped name, in order to Lepidocyclina scales out of the session. Its axial section can be divided into three parts: the middle equatorial shell