The earliest occurrence of the ichnogenus Psilonichnus: a new record from the Mississippian of the West of Ireland

IF 0.8 4区 地球科学 Q4 PALEONTOLOGY
Eamon Doyle, P. Orr, John Murray
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引用次数: 3

Abstract

Abstract The ichnogenus Psilonichnus Fürsich, 1981 is recorded for the first time from the Mississippian (Brigantian regional substage) limestones of the Slievenaglasha Formation from the west coast of County Clare, Ireland. This record extends the known range of Psilonichnus which has previously been recorded from rocks of Jurassic or younger age. The trace maker of the burrows described herein has not been preserved and remains unknown; however, the ichnogenus Psilonichnus is generally ascribed to the burrowing activities of decapod crustaceans such as crabs or shrimp. Decapods from the Paleozoic are poorly known and assigning the traces to a maker must be treated with caution. However, this record indicates that burrowing organisms using a similar life strategy to modern decapods were established by Brigantian times. These examples are assigned to the Glossifungites ichnofacies, as they occur on an omission surface in a shallow marine carbonate firmground. The burrows were subsequently infilled with deposits of possible storm origin. Glacioeustatic sea-level fluctuation related to the onset of the Late Paleozoic Ice Age is a common feature of Carboniferous sedimentary successions at this level, and the Irish (Mississippian) Psilonichnus horizon occurs just below a significant regional sequence boundary at the top of the Slievenaglasha Formation.
最早出现的飞鱼属:来自爱尔兰西部密西西比的新记录
摘要/ Abstract摘要:1981年首次在爱尔兰克莱尔郡西海岸Slievenaglasha组(Brigantian区域亚阶段)灰岩中记录到Psilonichnus filicich属。这一记录扩大了先前在侏罗纪或更年轻时期的岩石中记录的Psilonichnus的已知范围。本文所述洞穴的痕迹制造者未被保存,仍然是未知的;然而,鱼属Psilonichnus通常被认为是十足甲壳类动物(如螃蟹或虾)的穴居活动。人们对古生代的十足类动物知之甚少,要把这些痕迹归到一个制造者身上,必须谨慎对待。然而,这一记录表明,穴居生物使用与现代十足类动物相似的生活策略是在布里甘时代建立的。这些例子属于舌藻岩相,因为它们出现在浅海碳酸盐硬地的遗漏面上。这些洞穴随后被可能起源于风暴的沉积物填满。与晚古生代冰期开始有关的冰川上升海平面波动是石炭纪沉积序列的共同特征,爱尔兰(密西西比)Psilonichnus层位恰好位于Slievenaglasha组顶部的重要区域层序边界下方。
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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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