广西南部晚长兴期小型有孔虫及二叠系-三叠系界线讨论

广西南部板董和柳桥地区晚长兴期台地及台地坳陷区沉积地层中发育两个不同的小型有孔虫动物群，它们与放射虫相伴生，呈实体化石形式保存，展示出该时期有孔虫外部和部分内部构造特征。晚古生代以实体状态保存的有孔虫比较少见，长兴期有孔虫的研究更是主要基于薄片鉴定。本文系统描述了两个实体有孔虫动物群，它们主要由Nodosarioidea和Cornuspiroidea组成，多数是长兴期的常见分子，但同时也出现了中生代较繁盛的类型。与伴生的放射虫研究成果一致，这些中生代型有孔虫的发现指示了在古生代末一些分子穿过了二叠系-三叠系界线而没有受到大灭绝的影响。

SMALLER FORAMINIFERA FROM THE LATE CHANGHSINGIAN (LATEST PERMIAN) OF SOUTHERN GUANGXI AND DISCUSSION ON THE PERMIAN-TRIASSIC BOUNDARY

From two well dated Changhsingian sections of the platform and rift basin deposits in Bandong and Liu qiao areas, Guangxi Region of South China, two assemblages of smaller foraminifera have been found during radiolaria extractions. These specimens show external and partly inner structures, which is rather rare compared to studies from thin sections. The aim of this paper is to illustrate and briefly describe these assemblages because isolated Changhsingian foraminifera are relatively poorly known. They are essentially represented by Nodosarioidea and Cornuspiroidea. In coincidence with the radiolarians from the same samples in the Liuqiao section, the foraminifer assemblages contain some forms that are present in the Mesozoic and seem to cross over the Permian Triassic boundary without important disruption.