【摘要】 本文提出和描述了产自我国西北新疆南部喀拉塔克剖面的一个牙形类新亚种 Polygnathus communis gan-caohuensis,并根据以前出版的信息 ,命名了另一个新亚种 Polygnathus communis carmanae。种系发生研究揭示了Polygnathus communis Branson et Mehl的亚种对于法门阶最上部至韦宪阶地层的划分是至关重要的。此种的 cari-na→ gancaohuensis谱系 ,连同发现于喀拉塔克剖面的菊石、有孔虫和腕足动物 ,被认为是划分杜内 -韦宪阶界线的潜在的标志化石。因此 ,喀拉塔克剖面有可能成为全球杜内 -韦宪阶界线的一个候选层型剖面。更多还原

【Abstract】 This paper proposes and describes a new conodont subspecies Polygnathus communis gancaohuensis from the Tournaisian-Viséan boundary beds of the Karatag section in southern Xinjiang, northwestern China. Another new subspecies Polygnathus communis carmanae is also formally named on the basis of the previously published information. Phylogenetic study reveals that subspecies of Polygnathus communis Branson et Mehl are critical to the stratigraphy of the uppermost Famennian to Viséan. The carina→gancaohuensis lineage, along with index species of ammonoids, foraminifers and brachiopods, recovered from the Karatag section, is considered to be the potential criterion for defining the Tournaisian-Viséan boundary. The Karatag section hence is one of the possible candidates of the global stratotype of the Tournaisian-Viséan boundary.更多还原