当前位置: X-MOL 学术Ichnos › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Rhizocorallium and turtle tracks: a late Cretaceous proximal distributary channel trace-fossil assemblage, central Utah
Ichnos ( IF 0.8 ) Pub Date : 2020-05-20 , DOI: 10.1080/10420940.2020.1763337
M. Ryan King 1 , Scott E. Botterill 1 , Murray K. Gingras 1 , S. George Pemberton 1
Affiliation  

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.

中文翻译:

根珊瑚和海龟足迹:晚白垩世近端分流河道痕迹化石组合,犹他州中部

摘要 犹他州中部Turonian Ferron 砂岩中的近端分流河道沉积物包含由海龟足迹(Chelonipus)、脊椎动物游泳踪迹化石(Characichnos)、软体动物(Archaeonassa)、Rhizocorallium 和Teredolites 组成的踪迹化石组合。蜉蝣是现代淡水河道中水平、spreiten、U 形洞穴的大量生产者,但在岩石记录中很少被认为是根珊瑚的生产者。研究的原位痕迹化石被解释为淡水组合。Teredolites 出现在从地层较低的半咸水沉积物重新加工的外来碎屑中。这种铁砂岩组合提供了淡水鱼尾藻与挖出的咸水碎屑并置的例子。在考虑邻近的漫滩和碎屑周围的沉积结构时,在环境解释中必须谨慎行事。像这些复杂的微量化石关系可能在岩石记录中淡水沉积物的根珊瑚报告稀缺中起作用,并且可能比目前认识到的更常见。这项研究说明了解决进积环境(例如三角洲平原)中河道沉积物底部上方和下方的详细构造的重要性,在那里重新加工的咸水沉积物(和钻孔碎屑)可能夹带在上覆的低盐度相中。像这些复杂的微量化石关系可能在岩石记录中淡水沉积物的根珊瑚报告稀缺中起作用,并且可能比目前认识到的更常见。这项研究说明了解决进积环境(例如三角洲平原)中河道沉积物底部上方和下方的详细构造的重要性,在那里重新加工的咸水沉积物(和钻孔碎屑)可能夹带在上覆的低盐度相中。像这些复杂的微量化石关系可能在岩石记录中淡水沉积物的根珊瑚报告稀缺中起作用,并且可能比目前认识到的更常见。这项研究说明了解决进积环境(例如三角洲平原)中河道沉积物底部上方和下方的详细构造的重要性,在那里重新加工的咸水沉积物(和钻孔碎屑)可能夹带在上覆的低盐度相中。
更新日期:2020-05-20
down
wechat
bug