Rhizocorallium and turtle tracks: a late Cretaceous proximal distributary channel trace-fossil assemblage, central Utah

IF 0.8 4区 地球科学 Q4 PALEONTOLOGY
M. R. King, Scott E. Botterill, M. Gingras, S. Pemberton
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引用次数: 2

Abstract

Abstract A proximal distributary channel deposit in the Turonian Ferron Sandstone of central Utah contains a trace-fossil assemblage comprised of turtle tracks (Chelonipus), vertebrate swim trace fossils (Characichnos), repichnial traces of mollusks (Archaeonassa), Rhizocorallium, and Teredolites. Mayflies are abundant producers of horizontal, spreiten, U-shaped burrows in modern freshwater channels, but rarely ascribed as producers of Rhizocorallium in the rock record. The in situ trace fossils studied are interpreted as a freshwater assemblage. Teredolites occurs within allochthonous debris reworked from stratigraphically lower brackish-water deposits. This Ferron Sandstone assemblage provides an example of the juxtaposition of freshwater ichnocoenose with exhumed brackish-water clasts. Caution must be exercised in environmental interpretation when taking into consideration both adjacent floodplain and the sedimentary structures surrounding the clasts. Complex trace-fossil relationships such as these may play a role in the scarcity of Rhizocorallium reports from freshwater deposits in the rock record, and may be more common than presently recognized. This study illustrates the importance of addressing the detailed ichnology above and below the base of channel deposits in progradational environments (e.g., delta plain), where reworked, brackish-water deposits (and bored clasts) may be entrained within overlying lower salinity facies.
根根藻和海龟的足迹:犹他州中部晚白垩世近支流河道的足迹化石组合
摘要:美国犹他州中部Turonian Ferron砂岩近段分流河道沉积中含有龟迹(Chelonipus)、脊椎动物游泳迹化石(chalichnos)、软体动物(Archaeonassa)、Rhizocorallium和Teredolites的浅层迹像化石。在现代淡水河道中,蜉蝣是水平的、斑纹的、u形洞穴的丰富生产者,但在岩石记录中很少被认为是根茎藻的生产者。所研究的原位痕迹化石被解释为淡水组合。在地层较低的微咸水沉积物中改造过的异质碎屑中出现了铁泥石。铁砂岩组合提供了淡水岩屑与发掘出的微咸水碎屑并列的一个例子。在进行环境解释时,必须谨慎考虑相邻的泛滥平原和碎屑周围的沉积构造。诸如此类的复杂的痕迹化石关系可能在岩石记录中淡水沉积物中根茎藻报告的稀缺性中发挥作用,并且可能比目前认识到的更为普遍。这项研究说明了在进积环境(例如三角洲平原)中,解决水道沉积物底部上下详细技术的重要性,在这些环境中,改造过的微咸水沉积物(和钻孔碎屑)可能被夹带在上覆的低盐度相中。
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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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