Teredolites driftwood from the Arkadelphia Formation–Midway Group Contact (K–Pg), Malvern, Arkansas, USA

IF 0.8 4区 地球科学 Q4 PALEONTOLOGY Ichnos-An International Journal for Plant and Animal Traces Pub Date : 2022-10-02 DOI:10.1080/10420940.2023.2182298
Harry M. Maisch, Martin A Becker
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引用次数: 1

Abstract

Abstract Partially carbonized driftwood recovered from a lag deposit at the Arkadelphia Formation–Midway Group Contact (K–Pg) near Malvern, Arkansas contains an abundance of macrobioerosion. Macroborings are oriented perpendicular and oblique to the wood grain, straight to sinuous in shape, ≤8 cm long, may have calcitic linings, and belong to Teredolites clavatus (Kelly & Bromley, 1984). The abundance and tightly spaced position of borings on all driftwood surfaces suggests the wood was afloat and/or exposed on or near the seafloor in a shallow marine setting for an extended period of time before becoming buried. Transverse, radial, and tangential thin section analysis of the driftwood identifies distinct growth rings, tracheid and ray cells, ray pits, and resin canals of the bald cypress genus, Taxodium. The presence of Taxodium wood in addition to a diverse and abundant assemblage of transitional to shallow marine vertebrates in the Gulf Coastal Plain of southwestern Arkansas indicate that brackish water swamps were in proximity to the ancestral shoreline around the K–Pg boundary and that these remains were concentrated into a lag deposit as the result of storm events, sea-level cyclicity, and possibly impact generated tsunamis.
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来自美国阿肯色州马尔文的阿卡德尔菲地层-中途群接触层(K-Pg)的铁纹石浮木
在阿肯色州马尔文附近的阿卡德尔菲地层-中途群接触体(K-Pg)的一个沉积物中发现了部分碳化的浮木,其中含有丰富的大型生物侵蚀。大钻孔与木纹垂直或斜向,形状直或曲,长度≤8 cm,可能有钙质衬里,属于Teredolites clavatus (Kelly & Bromley, 1984)。所有浮木表面钻孔的数量和密集的位置表明,这些木材在被掩埋之前,在浅海环境中漂浮和/或暴露在海底或附近很长一段时间。横切面、径向和切向的薄片分析鉴定了秃柏树属Taxodium的独特的生长环、管胞和射线细胞、射线凹陷和树脂管。在阿肯色西南部的墨西哥湾沿岸平原,除了杉藻木材的存在,还有丰富多样的过渡到浅海脊椎动物的组合,表明咸淡水沼泽靠近K-Pg边界附近的祖先海岸线,这些遗迹集中在一个滞后沉积物中,这是风暴事件、海平面周期性和可能的冲击产生的海啸的结果。
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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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