Possibly the oldest fish-made resting traces

IF 0.8 4区 地球科学 Q4 PALEONTOLOGY
K. Ayranci, A. Wetzel, M. Kaminski, Bedri Kurtuluş, L. Rabaoui
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引用次数: 0

Abstract

Abstract The Silurian Sharawra Member (middle to late Llandoverian) in Saudi Arabia exhibits unique surface traces with exceptional preservation: Seven small, wing-shaped traces occur on a sandstone slab showing well-defined hummocky cross-stratification having a few decimeters wavelength being covered by a thin mud layer. These traces are preserved as concave epirelief along with elongated internal striae and surrounded by slightly elevated levees. Preservation of these delicate, 10–20 mm long and ∼10 mm wide traces suggests that they were formed after a storm event when mud had already settled to the sediment surface. The lack of wave-generated sedimentary structures implies deposition between fair-weather and storm-wave base probably preventing further rapid reworking by waves. Based on their geometry, internal pattern, and spatial distribution, these wing-shaped traces are interpreted to have been produced by relatively stationary bottom-feeding fish, morphologically similar to ancestors of Gobiidae, probably in the Actinopterygii class. The majority of fish-made trace fossils record feeding and locomotion behaviour, whereas the wing-shaped traces are interpreted to represent resting structures made by fish that pressed their fins downward on the muddy sediment surface and hence, represent undertracks. These traces are possibly the oldest fish-made structure documented thus far. These wing-shaped traces are described as Pisquiesichnus dashtgardi igen. et isp. nov. in this study.
可能是最古老的鱼留下的休息痕迹
沙特阿拉伯志留系Sharawra段(landoverian中晚期)表现出独特的表面痕迹,保存得非常好:在砂岩板上出现了7个小的翼状痕迹,显示出清晰的丘状交叉层状,其波长为几分米,被薄泥层覆盖。这些痕迹被保留为凹形的外浮雕,沿著细长的内部条纹,周围有略高的堤防。这些精致的10 - 20毫米长、10 - 10毫米宽的痕迹保存下来表明,它们是在一场风暴事件之后形成的,当时泥浆已经沉降到沉积物表面。波浪形成的沉积结构的缺乏意味着风平浪静和风暴波基底之间的沉积,这可能阻止了波浪进一步的快速改造。根据它们的几何形状、内部模式和空间分布,这些翅膀形状的痕迹被解释为由相对静止的底食性鱼类产生的,在形态上与虾蛄科的祖先相似,可能属于放线翼类。大多数鱼类留下的痕迹化石记录了进食和运动行为,而翅膀形状的痕迹被解释为鱼类在泥泞的沉积物表面向下按压鳍时留下的休息结构,因此代表了足迹。这些痕迹可能是迄今为止记载的最古老的鱼制结构。这些翅膀状的痕迹被描述为Pisquiesichnus dashgardi igen。isp。在这项研究中。
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来源期刊
CiteScore
2.50
自引率
12.50%
发文量
0
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.
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