Smithian ammonoid faunas from northeastern Nevada: implications for Early Triassic biostratigraphy and correlation within the western USA basin

IF 1.8 2区地球科学 Q2 PALEONTOLOGY

Palaeontographica Abteilung A-Palaozoologie-Stratigraphie Pub Date : 2017-11-23 DOI:10.1127/PALA/2017/0070

Romain Jattitot, H. Bucher, A. Brayard, Morgane Brosse, J. Jenks, K. G. Bylund

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引用次数: 22

Abstract

Intensive sampling of the lower portion of the Thaynes Group within the Palomino Ridge area (northeastern Nevada) yielded abundant and well-preserved Smithian (Early Triassic) ammonoid faunas. Ammonoid taxonomy and a detailed biostratigraphy for this locality are reported herein. One new genus (Palominoceras) and one new species (?Pseudosageceras bullatum) are described. Additionally, based on new data from Palomino Ridge and previous data from neighboring localities in Utah, we porvide here the first quantitative Smithian ammonoid biochronological scheme for the western US basin. This new zonation is based on the Unitary Associations (UA) method. The biochronical sequence comprises five unitary association zones that can be correlated with other localities from the Northern Indian Margin (Salt Range, Pakistan, Spiti, northern India and Tulong, South Tibet). Three unitary association zone (UAZ1, UAZ2 and UAZ3) are defined for the early Smithian, one (UAZ4) spans the entire middle Smithian and one (UAZ5) signifies the first part of the late Smithian. Finally, a hypothetical UAZ6 would represent the second part of the late Smithian.

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内华达东北部的史密斯氨类动物群:对美国西部盆地早三叠世生物地层学和对比的意义

在Palomino Ridge地区(内华达州东北部)对Thaynes群下部进行了密集采样，发现了大量保存完好的史密斯(早三叠世)氨类动物。本文报道了该地区的菊石分类和详细的生物地层学。一新属(Palominoceras)和一新种(?描述了假sageceras bullatum)。此外，基于Palomino Ridge的新数据和犹他州邻近地区的先前数据，我们在这里提供了美国西部盆地的第一个定量史密斯氨生物年代学方案。这个新的分区基于统一关联(UA)方法。该生物年代学序列包括5个单一的联合带，可与北印度边缘的其他地区(巴基斯坦盐岭、印度北部斯皮提和西藏南部土龙)进行对比。其中，UAZ1、UAZ2和UAZ3为早期史密斯纪，UAZ4为整个中史密斯纪，UAZ5为晚期史密斯纪的第一部分。最后，假设的UAZ6将代表后期史密斯的第二部分。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Palaeontographica Abteilung A-Palaozoologie-Stratigraphie 地学-古生物学

CiteScore

3.80

自引率

3.70%

发文量

审稿时长

>12 weeks

期刊介绍： Palaeontographica Section A publishes peer reviewed results of studies on palaeozoology, paleoecology and biostratigraphy. Its large paper format provides sufficient space for large tables, illustrations, photographs and Palaeontographica’s renowned plates. Published contributions span all areas of palaeozoology, i.e., systematic, phylogenetic and ecological aspects. Careful peer review ensures the high quality of the papers, covering localities all over the world. Many landmark papers in palaeozoology and biostratigraphy were published in Section A of Palaeontographica. This includes numerous lavishly illustrated monographs of certain groups of fossils and stratigraphic ranges. These monographs, are typical for Paleontographica papers, characterised by numerous highest quality plates and are printed on special high quality paper for excellent reproduction of picture plates.