贵州紫云四大寨地区中二叠世鱼类微体化石

Middle Permian Fish Microremains from the Sidazhai Area,Ziyun County,Guizhou Province

本文记述了贵州紫云四大寨地区晒瓦群第三段中的几种鱼类的鱼鳞和鱼牙化石,如卵形叶片鳞(新属、新种)(Lamnilance ovalis gen.et sp.nov.),不对称脆弱鳞(新种)(Fragilicorona asymmetriia sp.nov.),贵州脆弱鳞(新种)(Fragilicorona guizhouensis sp.nov.)等。这些鱼类微体化石与牙形刺Sweetognathus inornatus,Sweetognathus paraguizhouensis,Hindeodus minutus,Hindeodus cf.ellisoni,Euprioniodinasp.,Hibbardelloidessp.,Hindeodellasp.A,Hindeodella sp.B,Neoprioniodus sp.,Ozarkodina sp.等共生,表明其所在的地层的时代为中二叠世。

This paper reports some fish microremains from the Third Member of the Shaiwa Group in the Sidazhai area, Ziyun County, Guizhou Province, such as Lamnilance ovalis gen. et sp. nov., Fragilicorona asymmetriia sp. nov. ,Fragilicorona guizhouensis sp. nov. and two indeterminate genera and species. Those fish mieroremains are associated with conodonts Sweetognathus inornatus, Sweetognathus paraguizhouensis, Hindeodus minutus, Hindeodus cf. ellisoni, Euprioniodina sp., Hibbardelloides sp. , Hindeodella sp. A, Hindeodella sp. B, Neoprioniodus sp. and Ozarkodina sp. According to the analysis of the conodont assemblage, the fish-microremains-bearing beds, namely the Third Member of the Shaiwa Group, are of Middle Permian in age.