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

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
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美国北卡罗来纳州昂斯洛湾水下陆架中巨齿鲨和楚布特齿鲨牙齿的宏观钻孔:对滞后沉积物形成过程的影响

DOI:
10.1080/10420940.2019.1697257
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发表时间:
2020
期刊:
影响因子:
0.8
通讯作者:
Chamberlain, John A.
Chamberlain, John A.
中科院分区:
地球科学4区
文献类型:
--
作者:
Maisch, Harry M.;Becker, Martin A.;Chamberlain, John A.

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北卡罗来纳州昂斯洛湾西南部恐怖角地区的浅大陆架含有大量的巨齿鲨牙齿,属于Otodus megalodon(Agassiz 1835)和Otodus chubutensis(Ameghino 1906),分别来自上新世约克镇和中新世Pungo河地层。这些牙齿表现出不同的频率和方向的大钻孔确定为GastrochaensporticoKelly和Bromley,GastrochaensporticusKelly和Bromley,Maeandropolydora sulcansVoigt和?内生菌归因于石内双壳类、蛇形蠕虫和海绵。在含O. megalodonandO. chubutensisteeth是反复挖掘和改造的结果,以应对风暴事件和glacioeustatically驱动的海平面周期性在昂斯洛湾的测深控制波为基础的侵蚀。O. megalodonandO. chubutensisteeth含有大钻孔表明,这些滞后沉积物可能已经形成以来晚早中新世。
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 toOtodus megalodon(Agassiz 1835) andOtodus 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 asGastrochaenolites torpedoKelly and Bromley ,Gastrochaenolites lapidicusKelly and Bromley ,Maeandropolydora sulcansVoigt and ?Entobiaisp. attributed to endolithic bivalves, serpulid worms and clionaid sponges. Different frequencies and orientations of macroborings seen in lag deposits containingO. megalodonandO. chubutensisteeth 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 ofO. megalodonandO. chubutensisteeth that contain macroborings indicate that these lag deposits may have been forming since the late early Miocene.
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