【摘要】 <正> 东巧组是中国科学院青藏高原综合科学考察队建立的(文世宣,1979年,154页),当时根据有限的化石资料,认为其时代可能属于晚侏罗世。后来,长春地质学院藏北科考队在同一地点的相同层位中采获了较多的化石标本,并测制了剖面。根据双壳类Pterinella的发现,确定东巧组的时代为早白垩世。东巧组的命名地点在安多县东巧西北约5公里处,它以不整更多还原

【Abstract】 The stromatoporoids dealt with in this paper were mainly acquired from the Late Jurassic and Early Cretaceous deposits in Dongqiao of Amdo, northern Xizang. These deposits are named as the Dongqiao Formation. Nine species within five genera, including 5 new species are here described and figured. They are: Milleporella amdoensis sp. nov., M. dongqiaoensis sp. nov., Tosastroma kiiense Yabe and Sugiyama, Xizangstromatopora robusta sp. nov., X. nagquensis Dong, Milleporidium gracile sp. nov. M. cylindricum Yavorsky, M. kabardinense Yavorsky, Cladocoropsis dongqiaoensis sp. nov., The stromatoporoids are associated with bivalves Pterinella sp., Mytilus sp., Vlacunopsis sp., Protocardia sp.; hexacoral Latasastrea? sp; gastropods Multiptyxis sp., Nerinae sp.; fossil plants Cupressinocladus sp., Podozamites sp. and Nilssonia sp., of which most are representatives of the Lower Cretaceous. In Bangoin, N. Xizang, we have also found a specimen of Actinostromaria maxima Schnorf. from the Lower Cretaceous Hamoshan Formation.Among the above fossils, Pterinella, as a widespread form, is characteristic of Lower Cretaceous in the Tethys. Through the study of stromatoporoids, we believe that the Dongqiao Formation can be correlated with the Upper Jurassic Kimmeridgian stage and the Lower Cretaceous Valanginian stage, for the stromatoporoids of the Dongqiao Formation bear a close affinity to those of the Upper Jurassic and Lower Cretaceous of the Tethys.更多还原