一、前言 以探讨历史海洋学为目的的新生代海相地层的有孔虫研究工作,近年来已取得了一定的成效。 有孔虫分析研究之所以能广泛开展,不仅因为此类动物是鉴别海相地层的重要标志。能够说明周期性的海水进退,而且其种属繁多、分布广泛,动物组合常成为区域地层组分和对比的良好依据。特别是对有些地质时代的深海沉积物来说,是优良的标准化石。此 I. INTRODUCTION The research on foraminifera in the Cenozoic marine strata aimed at exploring historical oceanography has achieved some success in recent years. The research on foraminifera can be widely carried out not only because such animals are important markers for identifying marine strata. It can indicate periodic seawater advance and retreat, and its species is numerous and widely distributed. Animal assemblage often serves as a good basis for regional stratigraphic composition and contrast. Especially for deep sea sediments of some geological times, it is an excellent standard fossil. this