本溪组命名剖面牙形刺动物群的特征及地质时代

Characters and geological age of conodont fauna from denominated section of Benxi Formation

报道了在辽宁本溪牛毛岭的本溪组命名剖面的本溪组上部牙形刺化石研究的新进展。在该组上部灰岩层中发现Idiognathodus delicatus—I.podolskensis组合为代表的牙形刺动物群。该动物群中Idiognathodus podolskensis,I.delicatus,Neognathodus inaequalis,N.roundyi等晚石炭世莫斯科期标准化石的发现表明,本溪组上部可大体与莫斯科阶的中上部相对比。本溪组下部的时代可能为早石炭世晚期。

A new research is reported on the conodonts from the upper Benxi Formation in the denominated profile of Niumaoling in Benxi, Liaoning. The authors found the conodont fauna represented by Idiognathodus delicatus-I, podolskensis assemblage in the upper part of the limestone, containing some index fossils of the Moscovian of Late Carboniferous, e. g. ldiognathodus podolskensis, I. delicatus, Neognathodus inaequalis and N. roundyi. The fact indicates that the upper part of the Benxi Formation approximately corresponding to the middle-upper Moscovian. While the lower part of the Benxi Formation probably includes the deposits of the upper Lower Carboniferous.