在东亚马逊地区渐新世-中新世碳酸盐沉积中发现Sinusichnus sinuosus

IF 0.8 4区地球科学 Q4 PALEONTOLOGY

Ichnos-An International Journal for Plant and Animal Traces Pub Date : 2020-04-02 DOI:10.1080/10420940.2019.1697256

J. L. Soares, H. P. Santos, A. Brito, A. A. E. Nogueira, A. Nogueira, K. Amorim

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引用次数: 9

摘要

摘要Sinusichnus Gibert 1996首次记录于巴西北部渐新世-中新世Pirabas组。在渐新世-中新世碳酸盐矿床中，Sinusichnus sinusus具有水平的、高度规则的、具有T形和h形分支点的正弦穴道系统。此处描述的S. sinuosus与世界上其他发生的S. sinusus之间的主要区别是洞穴的异常直径(4至10厘米)。这些微量化石赋存于碳酸盐岩台地内古环境中富含有机质、与粘结岩互层的碎屑岩/包覆岩和层状泥岩中。所研究的S. sinuosus的特殊尺寸可能与生产者的尺寸有关，这可能归因于大型甲壳类动物的建造，类似于在Pirabas地层中发现的化石。此外，正弦形态和后退特征可能是穴居行为的结果。

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The crustaceans burrow Sinusichnus sinuosus from the Oligocene-Miocene carbonate deposits of eastern Amazonia

Abstract Sinusichnus Gibert 1996 is recorded for the first time in the Oligocene-Miocene Pirabas Formation of Northern Brazil. In these Oligocene-Miocene carbonate deposits, Sinusichnus sinuosus is characterized by horizontal, highly regular sinusoidal burrow systems with T- and H-shaped branching points. The main difference between the S. sinuosus described herein and other occurrences worldwide is the anomalous diameter of the burrows (4 to 10 cm). These trace fossils occur in organic matter-rich, wackestone/packstone and laminated mudstones interbedded with boundstones deposited in an inner carbonate platform paleoenvironment. The exceptional size of the studied S. sinuosus could have been associated to the producer’s size, which may be attributed to construction by large crustaceans, similar to fossils found within the Pirabas Formation. Also, the sinusoidal morphology and retrusive spreiten could be a result of the fodinichnial/domichnial behavior.

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来源期刊

Ichnos-An International Journal for Plant and Animal Traces PALEONTOLOGY-

CiteScore

2.50

自引率

12.50%

发文量

审稿时长

>12 weeks

期刊介绍： The foremost aim of Ichnos is to promote excellence in ichnologic research. Primary emphases center upon the ethologic and ecologic significance of tracemaking organisms; organism-substrate interrelationships; and the role of biogenic processes in environmental reconstruction, sediment dynamics, sequence or event stratigraphy, biogeochemistry, and sedimentary diagenesis. Each contribution rests upon a firm taxonomic foundation, although papers dealing solely with systematics and nomenclature may have less priority than those dealing with conceptual and interpretive aspects of ichnology. Contributions from biologists and geologists are equally welcome. The format for Ichnos is designed to accommodate several types of manuscripts, including Research Articles (comprehensive articles dealing with original, fundamental research in ichnology), and Short Communications (short, succinct papers treating certain aspects of the history of ichnology, book reviews, news and notes, or invited comments dealing with current or contentious issues). The large page size and two-column format lend flexibility to the design of tables and illustrations. Thorough but timely reviews and rapid publication of manuscripts are integral parts of the process.