Macroborings in Otodus megalodon and Otodus chubutensis shark teeth from the submerged shelf of Onslow Bay, North Carolina, USA: implications for processes of lag deposit formation

IF 0.8 4区地球科学 Q4 PALEONTOLOGY

Ichnos-An International Journal for Plant and Animal Traces Pub Date : 2020-04-02 DOI:10.1080/10420940.2019.1697257

Harry M. Maisch, Martin A Becker, J. Chamberlain

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引用次数: 5

Abstract

Abstract The shallow continental shelf in the Cape Fear Region of southwestern Onslow Bay, North Carolina, contains lag deposits with an abundance of megatoothed shark teeth belonging to Otodus megalodon (Agassiz 1835) and Otodus chubutensis (Ameghino 1906) that derive from the Pliocene Yorktown and Miocene Pungo River formations, respectively. These teeth exhibit different frequencies and orientations of macroborings identified as Gastrochaenolites torpedo Kelly and Bromley (1984), Gastrochaenolites lapidicus Kelly and Bromley (1984), Maeandropolydora sulcans Voigt (1965) and ?Entobia isp. attributed to endolithic bivalves, serpulid worms and clionaid sponges. Different frequencies and orientations of macroborings seen in lag deposits containing O. megalodon and O. chubutensis teeth are the result of repeated exhumation and reworking in response to bathymetrically controlled wave-based erosion during storm events and glacioeustatically driven sea-level cyclicity across Onslow Bay. Chronological ranges of O. megalodon and O. chubutensis teeth that contain macroborings indicate that these lag deposits may have been forming since the late early Miocene.

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美国北卡罗莱纳昂斯洛湾水下陆架巨齿鲨和chubutensis齿鲨牙齿中的大钻孔:对滞后沉积形成过程的启示

北卡罗莱纳Onslow湾西南部的Cape Fear地区浅层大陆架含有大量巨齿鲨(Otodus megalodon, Agassiz 1835)和巨齿鲨(Otodus chubutensis, Ameghino 1906)的巨齿鲨牙齿，它们分别来自上新世的Yorktown和中新世的Pungo河地层。这些牙齿显示出不同频率和方向的大钻孔，鉴定为Gastrochaenolites torpedo Kelly and Bromley (1984)， Gastrochaenolites lapidicus Kelly and Bromley (1984)， Maeandropolydora sulcans Voigt(1965)和Entobia isp。归于内生双壳类、蛇形蠕虫和克隆海绵。在含有巨齿鲨和chubutensis牙齿的沉积层中发现的不同频率和方向的大钻孔，是在风暴事件和冰流驱动的昂斯洛湾海平面旋回过程中反复挖掘和重新加工的结果。巨齿鲨和chubutensis牙齿包含大钻孔的年代范围表明这些滞后沉积物可能在中新世晚期早期形成。

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来源期刊

Ichnos-An International Journal for Plant and Animal Traces PALEONTOLOGY-

CiteScore

2.50

自引率

12.50%

发文量

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.