Ichnological analysis of Jurassic shallow to marginal marine deposits: example from Wagad Highland, Western India

IF 0.8 4区 地球科学 Q4 PALEONTOLOGY Ichnos-An International Journal for Plant and Animal Traces Pub Date : 2020-01-02 DOI:10.1080/10420940.2019.1612390
Jaquilin K. Joseph, S. Patel, Jehova L. Darngawn, Apurva D. Shitole
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引用次数: 2

Abstract

Abstract Jurassic deposits of shallow to marginal marine (delta) environments are widely reported from different continents of the world. This study shows inter-relationship of the animal-sediment behaviours in shallow and marginal marine conditions, suggesting an interpretation of the possible ichnodisparity. The Jurassic succession exposed at Washtawa Dome and Adhoi Anticline of Wagad highland, Kachchh comprises an approximately 341 m thick succession, divided into two formations – Lower Washtawa and Upper Wagad Sandstone. Eight sparsely to highly bioturbated sedimentary units show twenty-three identifiable ichnospecies from fifteen ichnogenera representing five ichnoassemblages broadly attributable to the Skolithos and the Cruziana ichnofacies, and developed in shallow-marine strandplain shoreface and delta depositional facies. The relative frequency statistical data reveals the dominant occurrence of feeding structures generated by polychaetes preferentially in quartz arenites. These structures represent sub-horizontal, sub-vertical and complex burrows, and show twelve and six categories of architectural designing Callovian-Oxfordian of shallow-marine shoreface and Oxfordian-Kimmeridgian shallow-water delta successions, respectively. The lower ichnodiversity and ichnodisparity associated with the Oxfordian-Kimmeridgian deltaic intervals represents a decrease in the exploitation of under-used ecospace, due to unfavourable environmental conditions rather than an expression of evolutionary radiation.
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侏罗纪浅层至边缘海相沉积的技术分析:以印度西部Wagad高地为例
摘要侏罗系浅海至边缘海相(三角洲)沉积在世界各大洲均有广泛报道。该研究显示了浅海和边缘海洋条件下动物-沉积物行为的相互关系,为可能的技术差异提供了解释。在Kachchh Wagad高地的Washtawa Dome和Adhoi背斜上暴露的侏罗纪演替包括约341 m厚的演替,分为下Washtawa和上Wagad砂岩两组。8个稀疏至高度生物扰动的沉积单元显示了15个鱼属的23种可识别的鱼种,代表了可广泛归属于斯科利索和克鲁齐亚纳鱼相的5个鱼组合,发育于浅海滨平原滨面和三角洲沉积相。相对频率统计数据显示,多毛藻形成的取食构造在石英砂岩中占优势。这些构造表现为亚水平、亚垂直和复杂的洞穴,分别显示出卡洛纪—牛津纪浅海滨面和牛津纪—金默里吉纪浅水三角洲序列的12类和6类建筑设计。与牛津-基默里吉河三角洲段相关的较低的生物多样性和生物多样性差异表明,由于不利的环境条件,对未充分利用的生态空间的开发减少,而不是进化辐射的表现。
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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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