A Late Ordovician Conodont Fauna from the Lower Limestone Member of the Benjamin Limestone in Central Tasmania, and Revision of 'Tasmanognathus careyi' Burrett, 1979
A Late Ordovician Conodont Fauna from the Lower Limestone Member of the Benjamin Limestone in Central Tasmania, and Revision of 'Tasmanognathus careyi' Burrett, 1979
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发表时间：
2010-07
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通讯作者：
Y. Zhen;C. Burrett;Ig Percival;B. Lin
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作者：
Y. Zhen;C. Burrett;Ig Percival;B. Lin
10种牙形石，包括'Aphelognathus？Belodina compressa ., Chirognathus tricostatus ., Drepanodus ., gen.等。“原安德罗斯？”‘nogamii’， ‘Phragmodus undatus’， ‘Tasmanognathus careyi’和T. sp. cf. T。“careyi”来自本杰明石灰岩的下石灰岩成员，戈登组，暴露在佛罗伦萨山谷和塔斯马尼亚中部的永恒丘陵地区。对于。自30年前建立以来，第一次发现“塔斯马尼亚龙”的模式物种，T。“careyi”一词经过修订，被认可为一种含九价盐的装置，包括makellate M、alate Sa、digyate Sb、bipennate Sc、teropedate Sd、carminate Pa和Pb（角化Pb1和pastinate Pb2）元素。“Phragmodus undatus”和“Belodina compressa”在动物群中同时出现，表明本杰明灰岩下灰岩段处于最晚的Sandbian -最早的Katian（“Phragmodus undatus”牙形石带）时代。本文简要回顾了以前归属于“Tasmanognathus”的所有物种，并表明该属的分布比迄今为止所认识的更为广泛（在新南威尔士州、华北、塔里木盆地、韩国和俄罗斯东北部），可能出现在北美中部大陆的动物群中。
Ten conodont species, including 'Aphelognathus?' sp., Belodina compressa, Chirognathus tricostatus sp. nov., Drepanodus sp., gen. et sp. indet., 'Panderodus gracilis', 'Protopanderodus?' 'nogamii', 'Phragmodus undatus', 'Tasmanognathus careyi' and T. sp. cf. T. 'careyi' are documented from the Lower Limestone Member of the Benjamin Limestone, Gordon Group, exposed in the Florentine Valley and Everlasting Hills region of central Tasmania. For the . rst time since its establishment three decades ago, the type species of 'Tasmanognathus', T. 'careyi', is revised with recognition of a septimembrate apparatus including makellate M, alate Sa, digyrate Sb, bipennate Sc, tertiopedate Sd, carminate Pa, and Pb (angulate Pb1 and pastinate Pb2) elements. Co-occurrence of 'Phragmodus undatus' and 'Belodina compressa' in the fauna indicates a latest Sandbian to earliest Katian ('Phragmodus undatus' conodont Zone) age for the Lower Limestone Member of the Benjamin Limestone. All species previously attributed to 'Tasmanognathus' are briefly reviewed, and the distribution of the genus is shown to be more widespread than hitherto recognised (in New South Wales, North China, Tarim Basin, South Korea and northeast Russia), with a probable occurrence in North American Midcontinental faunas.