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A CONODONT FAUNA OF PERMIAN NORTHERN TEMPERATE ZONE FROM THE FANJIATUN FORMATION AT LIJIAYAO, JILIN
Author(s): 
Pages: 430-442,图版Ⅰ
Year: Issue:  4
Journal: ACTA MICROPALAEONTOLOGICA SINICA

Keyword:  牙形刺二叠纪北温带吉林;
Abstract: 在吉林省九台市三台乡李家窑附近的二叠系范家屯组中采到一特殊的牙形刺动物群.多数牙形刺都较小,锯齿发育,齿脊细齿不愈合.由一些未见报道的新分子组成.本文描述了4个新种(MesogondoJella changcunensis sp.Nov.,M.Jilinensis sp.Nov.,M.Multiserrata sp.Nov.,M.Pseudoaltudaensis sp.Nov.)和3个未命名新种(Mesogondolella sp.Nov.A,M.Sp.Nov.B,M.Sp.Nov.C).这一牙形刺动物群的时代可能为Wordian-Capitanian,前者的可能性更大. 范家屯组中的菊石既有世界性的属种,也有只限特提斯暖水域的属种和北方冷水域的属种,反映出冷暖混合的特征. 范家屯组中的牙形刺多为新种,可能多数代表温凉水域的分子,如Mesogondolella jilinensis sp.Nov.,M.Multiserrata sp.Nov.,M.Sp.nov.B,但Mesogondolella pseudoaltudoensis sp.Nov.有与M.Altudaensis相似的口面,而M.Sp.Nov.C也有与M.Shannoni相似的口面,可能属特提斯暖水域分子,也可能全部都属温凉水域的分子. 结合古地磁和构造地质资料分析,作者认为范家屯组中的牙形刺动物群生活于二叠纪北温带温凉的水域.
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