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.
中科院分区:
文献类型:
--
作者:
Maisch, Harry M.;Becker, Martin A.;Chamberlain, John A.
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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