关键词: 河套盆地, 临河坳陷, 陆相盆地, 第三系, 有孔虫目, 陆生生物, 沉积环境, 湖环境

Abstract: Foraminifera:Discorbis,Ammonia and Miliolidae have been discovered in the continental Tertiary in Hetao depression,Hetao basin located to the west of Taihangshan uplift.They are contained in the upper and middle part of Oligocene,and upper and middle part of Miocene.Associated fossils are continental ostracode:Cyprinotus and Cyprideis.Results of trace amount of elements,as well as carbon and oxygen isotope analysis of the samples taken from formations containing foraminifera give out contradictory data,thus,it is difficult to identify whether it is marine or continental deposits.However,from a specific geologic and topographic condition of Linhe depression that it is surrounded by Yinshan mountain,Wulashan mountain and Yimeng uplift,these foraminifera cannot be the products during transgression of the ocean,and should be a type of special continental organisms lived in the high salinity aqueous medium in the paleolake.