广西南垌早石炭世巴平组下段牙形刺新材料

本文系统研究了广西南垌早石炭世巴平组下段丰富的牙形刺,识别出Siphonodella duplicata,S.cooperi,S.obosoleta,S.quadruplicata,S.lobata,S.crenulata,S.sandbergi,S.eurylobata,S.isosticha,Gnathodus delicatus等重要的带化石。首次报道和描述了产自Siphonodella crenulata带下部牙形刺新材料,其中确立一新种:Siphonodella nandongensis sp.nov.Li;一新未定种:Siphonodellasp.nov.A;且修订了Siphonodella trirostrata Druce(1969)的含义。依据上述牙形刺:Siphonodella nandongensis sp.nov.Li;Siphonodellasp.nov.A和Siphonodella trirostrata Druce(1969)发育特征,认为Siphonodella nandongensis sp.nov.Li与Siphonodella sexplicata;Siphonodella sp.nov.A与Siphonodella quadruplicata(Branson et Mehl);Siphonodella trirostrata Druce(1969)与Siphonodella sandbergi Klapper演化关系密切,并确定所描述的化石新材料的层位是Siphonodella crenulata带下部,地质时代为早石炭世早期,为进一步精细地层划分提供了翔实资料。

NEW MATERIAL OF THE EARLY CARBONIFEROUS CONODONTS FROM THE LOWER MEMBER OF THE BAPING FORMATION IN NANDONG,GUANGXI,CHINA

Abundant conodont fossils,from the lower member of the Early Carboniferous Baping Formation in Nandong,Guangxi Autonomous Region,were studied systematically in this paper.A series of zonal conodonts,such as Siphonodella duplicata,S.cooperi,S.obosoleta,S.quadruplicata,S.lobata,S.crenulata,S.sandbergi,S.eurylobata,S.isosticha and Gnathodus delicatus,were recognized.The new conodont materials,including a new species Siphonodella nandongensis sp.nov.Li and an unnamed new species Siphonodellasp.nov.A from the lower part of Siphonodella crenulata zone,were reported and described for the first time.The definition of Siphonodella trirostrata Druce(1969)was revised.Siphonodella nandongensis sp.nov.Li and Siphonodella sexplicata,Siphonodellasp.nov.A and Siphonodella quadruplicata(Branson et Mehl,1934),Siphonodella trirostrata Druce(1969)and Siphonodella sandbergi Klapper,have close evolutionary relationships,respectively.The new conodont material appeared in the lower part of Siphonodella crenulata zone,indicates that the age of the strata is the early Early Carboniferous Tournaisian.