西藏安多县岗尼乡色哇组菊石( 五 )


产地和层位 安多县岗尼乡; 色哇组下部 。
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Early Bajocian ( Middle Jurassic) Ammonites from the Sewa Formation at Gangni Village ofAmdo County,Tibet
Abstract Ammonites sampled from the Sewa Formation near the Gangni village of Amdo County,Tibet,werepreviously referred to Witchellia,Sonninia,Stephanoceras,Dorsetensia,Phylloceras,Cadomites,Macrocepha-lites,Erycites,and Bouleiceras. Re-examination of the ammonites showed that they range from the Aalenian Con-cavum Zone to the Lower Bajocian Discites Zone. The ammonite collection consists of Ptychophylloceras cf. tatricum( Pusch,1837) ,Lytoceras sp. ,Euhoploceras cf. marginata Buckman,1892,Haplopleuroceras mundum Buck-man ,1892,Stephanoceras cf. telegdirothi Geczy,1967. A new species,Euhoploceras sewense n. sp. ,has beenerected. Palaeoecological features and distribution pattern of the ammonites indicate that the area from Paducuothrough Sewa,to the 114 road maintenance represents an elongated depression of the southern Qiangtang basinfrom the late Early Jurassic to the early Middle Jurassic.

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