Organic-walled microfossils from the Ediacaran Sete Lagoas Formation, Bambuí Group, Southeast Brazil: taxonomic and biostratigraphic analyses

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-03-18 DOI:10.1017/jpa.2023.83

M. Denezine, D. D. Do Carmo, Shuhai Xiao, Qing Tang, Vladmir Sergeev, A. Mazoni, C. Zabini

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Abstract

This work presents a detailed taxonomic study on organic-walled microfossils from the Ediacaran Sete Lagoas Formation (Bambuí Group) at the Barreiro section in the Januária area of the São Francisco basin, Brazil. Seven species are described, including Siphonophycus robustum (Schopf, 1968), Ghoshia januarensis new species, Leiosphaeridia crassa (Naumova, 1949), Leiosphaeridia jacutica (Timofeev, 1966), Leiosphaeridia minutissima (Naumova, 1949), Leiosphaeridia tenuissima Eisenack, 1958, and Germinosphaera bispinosa Mikhailova, 1986. These taxa are recovered for the first time in the Sete Lagoas Formation. They occur abundantly in the lower portion of the studied section, but only Ghoshia januarensis is present in the upper part of the studied section, probably due to environmental or taphonomic changes. Leiosphaeridia species, particularly Leiosphaeridia minutissima, dominate the organic-walled microfossil assemblage. Although most taxa described here have long stratigraphic ranges, they are consistent with a terminal Ediacaran age as inferred from detrital zircon data and tubular fossils (e.g., Cloudina and Corumbella) from the Sete Lagoas Formation. UUID: http://zoobank.org/7f92b900-0176-4da6-93a3-fd51edb22cbf

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巴西东南部班布伊组埃迪卡拉纪塞特拉戈斯地层的有机壁微小化石：分类学和生物地层学分析

本研究对巴西圣弗朗西斯科盆地亚努阿里亚地区巴雷罗断面埃迪卡拉纪塞特拉戈斯地层（班布伊组）的有机壁微小化石进行了详细的分类研究。共描述了 7 个物种，包括 Siphonophycus robustum（Schopf，1968 年）、Ghoshia januarensis 新种、Leiosphaeridia crassa（Naumova，1949 年）、Leiosphaeridia jacutica（Timofeev，1966 年）、Leiosphaeridia minutissima（Naumova，1949 年）、Leiosphaeridia tenuissima Eisenack，1958 年和 Germinosphaera bispinosa Mikhailova，1986 年。这些类群是首次在塞特拉戈斯地层中发现。它们大量出现在所研究地段的下部，但只有 Ghoshia januarensis 出现在所研究地段的上部，这可能是环境或岩石学变化所致。在有机壁微小化石群中，Leiosphaeridia 种类，尤其是 Leiosphaeridia minutissima 占据主导地位。虽然这里描述的大多数分类群具有较长的地层范围，但它们与根据锆英石数据和塞特拉戈斯地层中的管状化石（如Cloudina和Corumbella）推断出的埃迪卡拉纪末期一致。UUID: http://zoobank.org/7f92b900-0176-4da6-93a3-fd51edb22cbf

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.