关键词: 济阳坳陷, 早第三纪, 古生物学, 海侵, 有孔虫目, 栖管化石, 沉积环境

Abstract: Paleogene in the Jiyang depression,Shandong province,contains a number of marine an-cestry genera and species which are characterized by a low diversity and very strong variability and coexist with some typically continental organisms in a carbonate-gypsum depositional system at the begining of the lacustrine transgression and disappear with the increasing ofwater-depth.Therefore,their occurrance represents a biota in a large-closed Saliferous paleo-lake where no communication with the ancient sea has been found.Their existence can not be considered as a criteria of sea transgrassion.