Brachiopods of the Imtachan Formation in the Upper Permian of the Southern Verkhoyanie, Northeast Russia

R. Kutygin, V. Makoshin
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Abstract

An extensive collection of fossil brachiopods, all assigned to the Wuchiapingian Stage, was recovered from the lower part of the Imtachan Formation along the Ustupnyi Creek (right tributary of the Setorym River) in the Southern Verkhoyanie. It comprises strophalosiids (Strophalosia? aff. vollossovitschi (Fredericks), Strophalosia? sp., Subtaeniothaerus lungersgauzeni Solomina, Marginalosia? magna Abramov et Grigorjeva), spiriferids (Crassispirifer monumentalis Abramov et Grigorjeva, Crassispirifer cf. monumentalis Abramov et Grigorjeva, Crassispirifer sp.), athyridids (Cleiothyridina nikolaevi Grunt, Cleiothyridina sp. 1, Bajtugania sp.), and terebratulids (Marinurnula? aff. mantuanensis (Campbell), Marinurnula? sp.). The identified assemblage is associated with brachiopods from the lower part of the Khalpirki Formation of the Western Verkhoyanie, the appearance of which marks the boundary between the Dulgalakhian and Khalpirkian Regional Stages and also substantiates the lower boundary of the Crassispirifer monumentalis Zone. Single finds of Crassispirifer cf. monumentalis in the lower part of the Middle Imtachan Subformation indicate that the entire lower subformation and the lower part of the middle subformation belong to the C. monumentalis Zone. There are no reliable finds of brachiopods at higher levels of the Imtachan Formation.
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俄罗斯东北部Verkhoyanie南部上二叠统Imtachan组腕足类
在南部Verkhoyanie的usstupnyi Creek (Setorym河的右支流)沿线的Imtachan组下部,发现了大量的腕足类化石,它们都属于Wuchiapingian阶段。它包括strophalosiids (Strophalosia?《Strophalosia?》sp. Subtaeniothaerus lungersgauzeni Solomina, Marginalosia?大阿布拉莫夫等Grigorjeva)、棘足类(Crassispirifer monumentalis Abramov et Grigorjeva, Crassispirifer cf. monumentalis Abramov et Grigorjeva, Crassispirifer sp.)、甲状纲(Cleiothyridina nikolaevi Grunt, Cleiothyridina sp. 1, Bajtugania sp.)和有翼动物(Marinurnula?mantuanensis (Campbell), Marinurnula?sp)。该组合与西部Verkhoyanie Khalpirki组下部的腕足动物有关,其出现标志着Dulgalakhian和Khalpirkian区域阶段的边界,也证实了Crassispirifer纪念碑带的下边界。中Imtachan亚组下部单个发现的Crassispirifer c.s onentalis表明整个下亚组和中亚组下部属于C. monumentalis带。在Imtachan组的较高地层中没有可靠的腕足动物发现。
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17 weeks
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