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<p>The megatoothed shark genus <i>Otodus</i> has only been recorded previously from one locality in western Washington State, USA: <i>Otodus auriculatus</i> in the lower Eocene (Ypresian) part of the Crescent Formation in the Hamma Hamma River area, eastern Olympic Peninsula. Previously unpublished fossils from Washington expand the <i>Otodus</i> record from early Eocene to early or early middle Miocene. New specimens of <i>O</i>. <i>auriculatus</i> are from the middle Eocene (Lutetian) part of the Crescent Formation in the Canyon River area, southern Olympic Peninsula, and a fragmentary tooth from the middle Eocene (Bartonian) Aldwell Formation. Uppermost Eocene or lower Oligocene strata of the lower Lincoln Creek Formation south of the Olympic Mountains yielded a tooth fragment and a large vertebra of <i>Otodus</i> sp., and a large partial tooth referred to <i>O</i>. <i>angustidens</i> is from the uppermost Oligocene part of the Pysht Formation, northern Olympic Peninsula. <i>Otodus</i> cf. <i>chubutensis</i> is reported from the lower to middle Miocene Astoria Formation in southwestern Washington and coastal Oregon. Although rare, the fossils demonstrate that <i>Otodus</i> inhabited the northeastern Pacific Ocean from at least the early Eocene and even well past the period of cooling after the Eocene/Oligocene transition. Together, these fossils comprise the northernmost fossil record of the genus <i>Otodus</i> for the eastern Pacific Ocean.</p>

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Fossils of the megatoothed shark Otodus (Chondrichthyes, Lamniformes) from Washington State, USA

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  • 发表日期：

    2025年12月11日

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  • James L. Goedert,
  • Katherine L. Anderson,
  • Casey Burns,
  • Steffen Kiel

摘要

The megatoothed shark genus Otodus has only been recorded previously from one locality in western Washington State, USA: Otodus auriculatus in the lower Eocene (Ypresian) part of the Crescent Formation in the Hamma Hamma River area, eastern Olympic Peninsula. Previously unpublished fossils from Washington expand the Otodus record from early Eocene to early or early middle Miocene. New specimens of O. auriculatus are from the middle Eocene (Lutetian) part of the Crescent Formation in the Canyon River area, southern Olympic Peninsula, and a fragmentary tooth from the middle Eocene (Bartonian) Aldwell Formation. Uppermost Eocene or lower Oligocene strata of the lower Lincoln Creek Formation south of the Olympic Mountains yielded a tooth fragment and a large vertebra of Otodus sp., and a large partial tooth referred to O. angustidens is from the uppermost Oligocene part of the Pysht Formation, northern Olympic Peninsula. Otodus cf. chubutensis is reported from the lower to middle Miocene Astoria Formation in southwestern Washington and coastal Oregon. Although rare, the fossils demonstrate that Otodus inhabited the northeastern Pacific Ocean from at least the early Eocene and even well past the period of cooling after the Eocene/Oligocene transition. Together, these fossils comprise the northernmost fossil record of the genus Otodus for the eastern Pacific Ocean.