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下鲁硅岩为藏南日喀则地区雅鲁藏布蛇绿岩南侧的晚侏罗世—早白垩世硅质岩系。本文补充描述了该岩系中 4块标本的罩笼虫亚目放射虫化石 1 6属 2 3种 ,包括 8个新种。加上这些标本原已描述过的 1 8属 3 3种 ,共有 3 4属 56种。所有的属和近一半的种见于北美西部 ,可与那里的晚侏罗世放射虫分带很好地对比 ,它们分别相当于那里牛津期的 2 γ亚带和晚启莫里期—早提索期的 3 β亚带。动物群具特提斯生物地理区特征 ,但与西特提斯的地中海地区同期动物群显然不同 ,可能当时东特提斯与太平洋联系密切。
The Lower Silurian is Late Jurassic-Early Cretaceous siliceous rock system on the south side of the Yarlung Zangbo ophiolite in the Shigaze area of southern Tibet. This paper complements the description of 16 species, 23 genera, of which 4 subfamilies are contained in this series, including 8 new species. In addition, there are 38 genera and 38 genera of the eight species originally described in these specimens. Nearly half of all genera and nearly all species are found in western North America and can be well matched to the Late Jurassic radio-fauna there, which correspond to the 2 γ sub-band and the late Kai-mo-period, respectively, of the Oxford period 3 beta sub-band of the cord. The fauna is characterized by the Tethyan biogeography but is distinctly different from the contemporaneous fauna in the Mediterranean region of Western Tethys and may have been closely linked to the Pacific at that time.