The Early Pliocene extinction of the mega-toothed shark Otodus megalodon: a view from the eastern North Pacific
The extinct giant shark Otodus megalodon is the last member of the predatory megatoothed lineage and is reported from Neogene sediments from nearly all continents. The timing of the extinction of Otodus megalodon is thought to be Pliocene, although reports of Pleistocene teeth fuel speculation that...
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crpeerj:10.7717/peerj.6088 2024-06-02T08:11:40+00:00 The Early Pliocene extinction of the mega-toothed shark Otodus megalodon: a view from the eastern North Pacific Boessenecker, Robert W. Ehret, Dana J. Long, Douglas J. Churchill, Morgan Martin, Evan Boessenecker, Sarah J. 2019 http://dx.doi.org/10.7717/peerj.6088 https://peerj.com/articles/6088.pdf https://peerj.com/articles/6088.xml https://peerj.com/articles/6088.html en eng PeerJ http://creativecommons.org/licenses/by/4.0/ PeerJ volume 7, page e6088 ISSN 2167-8359 journal-article 2019 crpeerj https://doi.org/10.7717/peerj.6088 2024-05-07T14:14:12Z The extinct giant shark Otodus megalodon is the last member of the predatory megatoothed lineage and is reported from Neogene sediments from nearly all continents. The timing of the extinction of Otodus megalodon is thought to be Pliocene, although reports of Pleistocene teeth fuel speculation that Otodus megalodon may still be extant. The longevity of the Otodus lineage (Paleocene to Pliocene) and its conspicuous absence in the modern fauna begs the question: when and why did this giant shark become extinct? Addressing this question requires a densely sampled marine vertebrate fossil record in concert with a robust geochronologic framework. Many historically important basins with stacked Otodus -bearing Neogene marine vertebrate fossil assemblages lack well-sampled and well-dated lower and upper Pliocene strata (e.g., Atlantic Coastal Plain). The fossil record of California, USA, and Baja California, Mexico, provides such an ideal sequence of assemblages preserved within well-dated lithostratigraphic sequences. This study reviews all records of Otodus megalodon from post-Messinian marine strata from western North America and evaluates their reliability. All post-Zanclean Otodus megalodon occurrences from the eastern North Pacific exhibit clear evidence of reworking or lack reliable provenance; the youngest reliable records of Otodus megalodon are early Pliocene, suggesting an extinction at the early-late Pliocene boundary (∼3.6 Ma), corresponding with youngest occurrences of Otodus megalodon in Japan, the North Atlantic, and Mediterranean. This study also reevaluates a published dataset, thoroughly vetting each occurrence and justifying the geochronologic age of each, as well as excluding several dubious records. Reanalysis of the dataset using optimal linear estimation resulted in a median extinction date of 3.51 Ma, somewhat older than a previously proposed Pliocene-Pleistocene extinction date (2.6 Ma). Post-middle Miocene oceanographic changes and cooling sea surface temperature may have resulted in range ... Article in Journal/Newspaper North Atlantic PeerJ Publishing Baja Pacific PeerJ 7 e6088 |
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English |
description |
The extinct giant shark Otodus megalodon is the last member of the predatory megatoothed lineage and is reported from Neogene sediments from nearly all continents. The timing of the extinction of Otodus megalodon is thought to be Pliocene, although reports of Pleistocene teeth fuel speculation that Otodus megalodon may still be extant. The longevity of the Otodus lineage (Paleocene to Pliocene) and its conspicuous absence in the modern fauna begs the question: when and why did this giant shark become extinct? Addressing this question requires a densely sampled marine vertebrate fossil record in concert with a robust geochronologic framework. Many historically important basins with stacked Otodus -bearing Neogene marine vertebrate fossil assemblages lack well-sampled and well-dated lower and upper Pliocene strata (e.g., Atlantic Coastal Plain). The fossil record of California, USA, and Baja California, Mexico, provides such an ideal sequence of assemblages preserved within well-dated lithostratigraphic sequences. This study reviews all records of Otodus megalodon from post-Messinian marine strata from western North America and evaluates their reliability. All post-Zanclean Otodus megalodon occurrences from the eastern North Pacific exhibit clear evidence of reworking or lack reliable provenance; the youngest reliable records of Otodus megalodon are early Pliocene, suggesting an extinction at the early-late Pliocene boundary (∼3.6 Ma), corresponding with youngest occurrences of Otodus megalodon in Japan, the North Atlantic, and Mediterranean. This study also reevaluates a published dataset, thoroughly vetting each occurrence and justifying the geochronologic age of each, as well as excluding several dubious records. Reanalysis of the dataset using optimal linear estimation resulted in a median extinction date of 3.51 Ma, somewhat older than a previously proposed Pliocene-Pleistocene extinction date (2.6 Ma). Post-middle Miocene oceanographic changes and cooling sea surface temperature may have resulted in range ... |
format |
Article in Journal/Newspaper |
author |
Boessenecker, Robert W. Ehret, Dana J. Long, Douglas J. Churchill, Morgan Martin, Evan Boessenecker, Sarah J. |
spellingShingle |
Boessenecker, Robert W. Ehret, Dana J. Long, Douglas J. Churchill, Morgan Martin, Evan Boessenecker, Sarah J. The Early Pliocene extinction of the mega-toothed shark Otodus megalodon: a view from the eastern North Pacific |
author_facet |
Boessenecker, Robert W. Ehret, Dana J. Long, Douglas J. Churchill, Morgan Martin, Evan Boessenecker, Sarah J. |
author_sort |
Boessenecker, Robert W. |
title |
The Early Pliocene extinction of the mega-toothed shark Otodus megalodon: a view from the eastern North Pacific |
title_short |
The Early Pliocene extinction of the mega-toothed shark Otodus megalodon: a view from the eastern North Pacific |
title_full |
The Early Pliocene extinction of the mega-toothed shark Otodus megalodon: a view from the eastern North Pacific |
title_fullStr |
The Early Pliocene extinction of the mega-toothed shark Otodus megalodon: a view from the eastern North Pacific |
title_full_unstemmed |
The Early Pliocene extinction of the mega-toothed shark Otodus megalodon: a view from the eastern North Pacific |
title_sort |
early pliocene extinction of the mega-toothed shark otodus megalodon: a view from the eastern north pacific |
publisher |
PeerJ |
publishDate |
2019 |
url |
http://dx.doi.org/10.7717/peerj.6088 https://peerj.com/articles/6088.pdf https://peerj.com/articles/6088.xml https://peerj.com/articles/6088.html |
geographic |
Baja Pacific |
geographic_facet |
Baja Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
PeerJ volume 7, page e6088 ISSN 2167-8359 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.7717/peerj.6088 |
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PeerJ |
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7 |
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e6088 |
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1800757901337296896 |