The trace fossil Gyrolithes lorcaensis from the Lower Cretaceous of the Kopet-Dagh Basin, NE Iran

IF 0.8 4区地球科学 Q4 PALEONTOLOGY

Ichnos-An International Journal for Plant and Animal Traces Pub Date : 2021-12-30 DOI:10.1080/10420940.2021.2017921

S. Moosavizadeh, D. Knaust

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引用次数: 1

Abstract

Abstract The helical, vertical trace fossil Gyrolithes lorcaensis is described from marine to marginal-marine deposits of the Lower Cretaceous of the Sarcheshmeh Formation near the city Kalat-e-Naderi in the Kopet-Dagh Basin. This is the first report of Gyrolithes from Iran and thus expands the geographic range of this trace fossil. G. lorcaensis is characterized by its unique morphometric parameters, a small burrow size and whorl radius, which distinguishes it as the smallest Gyrolithes ichnospecies. The most likely producers of the Iranian Gyrolithes were crustacean decapods, which is supported by the paleoenvironment (shallow and warm water ramp) in which it is found. The function of the spiral structure in the described Gyrolithes of the Sarcheshmeh Formation can be explained as a permanent dwelling structure with the main purpose of farming bacteria via increasing the surface area of the burrow margin that allows more microbial activities. The small burrow dimensions may reflect reduced burrower body size in response to the dysoxic to anoxic conditions suggested by sedimentological evidence.

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伊朗东北部Kopet-Dagh盆地下白垩世古旋石化石

摘要:本文描述了Kopet-Dagh盆地Kalat-e-Naderi市附近下白垩世Sarcheshmeh组海相至边缘海相沉积物中螺旋形、垂直形的Gyrolithes lorcaensis化石。这是来自伊朗的首个Gyrolithes报告，从而扩大了这一痕迹化石的地理范围。G. lorcaensis以其独特的形态参数、较小的洞穴尺寸和螺旋半径为特征，使其成为最小的螺线虫鱼种。伊朗回转类动物最有可能的生产者是甲壳类十足类动物，这是由其发现的古环境(浅水和暖水斜坡)支持的。在Sarcheshmeh地层中描述的Gyrolithes螺旋结构的功能可以解释为一种永久性居住结构，其主要目的是通过增加洞穴边缘的表面积来养殖细菌，从而允许更多的微生物活动。较小的洞穴尺寸可能反映了沉积学证据表明的缺氧或缺氧条件下洞穴体型的缩小。

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

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.