Bryozoa of the uppermost Gerster Limestone (late Wordian, Permian), Medicine Range, northeastern Nevada, U.S.A.

Q3 Earth and Planetary Sciences

Rocky Mountain Geology Pub Date : 2014-09-01 DOI:10.2113/GSROCKY.49.2.137

E. H. Gilmour

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引用次数: 1

Abstract

Abundant bryozoans occur in the uppermost Gerster Limestone (Permian) in a saddle directly west of the main Medicine Range section of the Gerster Limestone of northeastern Nevada. The stratigraphic position of this shaly limestone is confirmed by the conodont Merrilina praedivergens (late Wordian), which occurs elsewhere in the uppermost Gerster Limestone. Three new genera and five new species of bryozoans have been discovered in this shaly limestone. Subsequent analyses identified the new genera as Autospinifera n. gen., Utgaardostylus n. gen., and Wyseotrypa n. gen. The new species are Autospinifera rossae n. sp., Utgaardostylus stylata n. sp., Wyseotrypa parallela n. sp., Dyscritella triangulara n. sp., and Dyscritellina laminata n. sp. Other species of bryozoans present were previously described from the Russian Far East, Murdock Mountain Formation of the Leach Mountains of northeastern Nevada, Phosphoria Formation of eastern Idaho, and Gerster Limestone of the Medicine Range section of Nevada. This bryozoan fauna represents a late middle-Permian boreal fauna.

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美国内华达东北部梅迪奇山脉格斯特石灰岩最上层的苔藓虫(世界晚期，二叠纪)

丰富的苔藓虫出现在格斯特石灰岩(二叠纪)的最上层，位于内华达州东北部格斯特石灰岩的主要医学山脉部分以西的马鞍上。该泥质灰岩的地层位置由出现在格斯特灰岩上部其他地方的牙形刺merilina praedivergens(晚世)证实。在这片泥质石灰岩中发现了3个新属和5个新种苔藓虫。随后的分析确定了新属为Autospinifera n. gen、Utgaardostylus n. gen和Wyseotrypa n. gen。新种为Autospinifera rossae n. sp、Utgaardostylus stylata n. sp、Wyseotrypa parallela n. sp、Dyscritella triangulara n. sp和Dyscritellina laminata n. sp。其他种类的苔藓虫以前在俄罗斯远东地区、内华达州东北部Leach山脉的Murdock山组、Idaho东部的Phosphoria组中被描述过。以及内华达州医学山脉地区的格斯特·莱姆斯通。苔藓虫动物群代表了中二叠世晚期的北方动物群。

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来源期刊

Rocky Mountain Geology Earth and Planetary Sciences-Geology

CiteScore

1.10

自引率

0.00%

发文量

期刊介绍： Rocky Mountain Geology (formerly Contributions to Geology) is published twice yearly by the Department of Geology and Geophysics at the University of Wyoming. The focus of the journal is regional geology and paleontology of the Rocky Mountains and adjacent areas of western North America. This high-impact, scholarly journal, is an important resource for professional earth scientists. The high-quality, refereed articles report original research by top specialists in all aspects of geology and paleontology in the greater Rocky Mountain region.