陕西富平晚奥陶世放射虫化石

在陕西富平上奥陶统一套深水斜坡相碳酸盐沉积下部，首次分离一个保存良好，属种丰富的放射虫化石组合－Ｉｎａｎｉｂｉｇｕｔｔａｐｉｎｇｌｉａｎｇｅｎｓｉｓ－Ｓｙｎｔａｇｅｎｔａｃｔｉｎｉａｂｉｏｃｃｕｌｏｓａ组合，计有７科，１４属，２２种，４新种，以Ｉｎａｎｉｇｕｔｔｉａｅ，Ｈａｌｐｅｎｔａｃｔｉｎｉｉｄａｅ，Ｐｏｌｙｅｎｔａｃｉｎｉｉｎａｅ为特征，与哈萨克斯坦放射虫组合成貌一致。

The Late Ordovician Radiolaria from Fuping of Shaanxi province,China

The Weibei area situated on the northern side of Wei River belongs to the north China plate tectonically, during Late Ordovician, the area has subsided and developed into deep water basin,accepting a suit of a total thickness of about 800 meters of carbonate slope deposits including thin bedded limestones, cherts, tuff and brecciola and slumped limestone. This set of stratigraphy, named Zhaolaoyu formation by Mei Zhi chao et al.(1986), yields radiolarians, graptolithes, conodonts in the lower part. Graptolithes and conodonts collected from the thin bedded limestones demonstrate Caradocian in age.A well preserved radiolarian assemblage Inanibigutta pingliangensis Syntagentactinia biocculosa assemblage produced in it is characterized by a high variety with seven families, fouttheen genera and twenty two species and dominance of Inaniguttidae, Halpentactiniidae, Polyentactiniinae.