摘要:本文描述了湖北恩施太陽河燈草坪剖面志留系秀山組頂部灰?guī)r夾層中的牙形刺。秀山組頂部的灰?guī)r產(chǎn)出較豐富的牙形刺化石,共10屬14種,包括Pterospathodus eopennatus,P, a.cf. angulatus,Apsidognathus sp.,Ozakodina paraplanussima , Ozakodina sp.,? Distomodus sp.,? Tuberocostadontus sp.,Coryssagnathus shaan nanensis , Wurmiella recave , Wurrniella sp., Oulodus shiqianensis , Oulodus sp., Pseudooneotodus beckmanni , Disto-modus sp.,根據(jù)牙形刺的產(chǎn)出情況,可識別出兩個牙形刺帶。秀山組頂部灰?guī)r可歸入Pterospathodus eopennatus超帶的P.eopennatus ssp.n.2帶。需要指出的是,秀山組最頂部樣品發(fā)現(xiàn)了P.a.cf.a(chǎn)ngulatus,因此,秀山組頂部的時代延伸至Pterospathodus celloni超帶的P.a(chǎn).a(chǎn)ngulatus帶,時代為蘭多維列世特列奇早-中期。
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