来自加拿大西部中寒武纪的一个巨型原宙

IF 0.8 4区 地球科学 Q4 PALEONTOLOGY
Chad A. Morgan, C. Henderson, B. Pratt
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引用次数: 2

摘要

原古猿属Książkiewicz一新种,1958,Pr. aitkeni isp。在加拿大阿尔伯塔省班夫国家公园,从中寒武纪斯蒂芬-埃尔登地层过渡中发现的物质命名。标本出现在白云质灰质泥岩床底的凸状洼地中,呈现出笔直到温和弯曲的“之字形”,长度可达45厘米。链相当规则,分支角度从110°到120°不等。形成链的分支段长度大致相同,形成的链具有沿标本轴线交替排列的开放和偶尔封闭的六边形多边形。六边形宽度为25 ~ 40mm,串宽为5 ~ 10mm。与鱼属的其他鱼种和一般的文字类动物相比,伊氏拟龙的体型较大。寄主层被解释为沉积在碳酸盐岩台地内部的相对浅水环境中,与较年轻的鱼属典型出现的较深的硅质碎屑环境形成对比。这一发现进一步支持了这样一种假设,即在地质时期转变为更深的相之前,纹雕类行为学最初是在浅层陆架环境中发展起来的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Giant Protopaleodictyon from the Middle Cambrian of Western Canada
Abstract A new ichnospecies of Protopaleodictyon Książkiewicz, 1958, Pr. aitkeni isp. n., is named from material recovered from the mid–Cambrian Stephen–Eldon formation transition in Banff National Park, Alberta, Canada. Specimens occur in convex hyporelief on the sole of a dolomitic lime mudstone bed, and exhibit straight to gently curving strands with a 'zigzag' shape up to 45 cm in length. Strands are fairly regular, with branching angles ranging from 110° to 120°. Branch segments forming the strand are approximately the same length and produce strands with open and occasionally closed hexagonal polygons arranged alternatively along the specimen's axis. Hexagons are 25–40 mm wide and string widths are 5–10 mm. The dimensions of Pr. aitkeni are large compared to other ichnospecies of the ichnogenus and graphoglyptids in general. The host interval is interpreted to have been deposited in a relatively shallow-water environment in the interior of a carbonate platform, contrasting with the deeper siliciclastic settings in which younger examples of the ichnogenus typically occur. This occurrence further supports the hypothesis that graphoglyptid ethology initially developed in shallow shelf environments before shifting into deeper facies over geologic time.
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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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