Megalodon, mako shark and planktonic foraminifera from the continental shelf off Portugal and their age
Turbidite fragments collected by a fishing net off the central Portuguese coast (Peniche) present some fossils. The matrix is phosphatized and iron-rich with small quantities of manganese, zinc and copper. The occurrence of Megaselachus megalodon most probably excludes an age older than Middle Mioce...
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ftunivevora:oai:dspace.uevora.pt:10174/17685 2023-09-05T13:22:39+02:00 Megalodon, mako shark and planktonic foraminifera from the continental shelf off Portugal and their age Antunes, Miguel Telles Legoinha, Paulo Balbino, Ausenda Cáceres 2015-09 http://hdl.handle.net/10174/17685 eng eng GeológicaActa http://hdl.handle.net/10174/17685 migueltellesantunes@gmail.com pal@fct.unl.pt acaceres@uevora.pt 372 10.1344 openAccess Megalodon Mako shark Planktonic foraminifera Continental Shelf Age article 2015 ftunivevora 2023-08-14T17:38:45Z Turbidite fragments collected by a fishing net off the central Portuguese coast (Peniche) present some fossils. The matrix is phosphatized and iron-rich with small quantities of manganese, zinc and copper. The occurrence of Megaselachus megalodon most probably excludes an age older than Middle Miocene. Its very advanced evolution stage is consistent with a Pliocene age. Based on planktonic foraminifera in depressions of cetacean skulls recovered in the same way, from the same area, the age of sharks and cetaceans is likely to range from latest Messinian to Early Pliocene. Condensed sedimentation is revealed by the co-occurrence of typical Late Pliocene and Quaternary foraminifera. Lack of benthic foraminifera suggests more or less deep environments, while a scallop, Mimachlamys varia, indicates nearby rocky substrate. The mako shark Isurus cf. oxyrhinchus is recorded in the area for the first time. The shark association represents a moderately warm environment as M. megalodon and Isurus are essentially temperate water dwellers, while no warm water form is known. Early Pliocene planktonic foraminifera point out to temperate to subtropical waters. Hence temperate to moderately warm conditions seem to have prevailed. Article in Journal/Newspaper Planktonic foraminifera Repositório Científico da Universidade de Évora |
institution |
Open Polar |
collection |
Repositório Científico da Universidade de Évora |
op_collection_id |
ftunivevora |
language |
English |
topic |
Megalodon Mako shark Planktonic foraminifera Continental Shelf Age |
spellingShingle |
Megalodon Mako shark Planktonic foraminifera Continental Shelf Age Antunes, Miguel Telles Legoinha, Paulo Balbino, Ausenda Cáceres Megalodon, mako shark and planktonic foraminifera from the continental shelf off Portugal and their age |
topic_facet |
Megalodon Mako shark Planktonic foraminifera Continental Shelf Age |
description |
Turbidite fragments collected by a fishing net off the central Portuguese coast (Peniche) present some fossils. The matrix is phosphatized and iron-rich with small quantities of manganese, zinc and copper. The occurrence of Megaselachus megalodon most probably excludes an age older than Middle Miocene. Its very advanced evolution stage is consistent with a Pliocene age. Based on planktonic foraminifera in depressions of cetacean skulls recovered in the same way, from the same area, the age of sharks and cetaceans is likely to range from latest Messinian to Early Pliocene. Condensed sedimentation is revealed by the co-occurrence of typical Late Pliocene and Quaternary foraminifera. Lack of benthic foraminifera suggests more or less deep environments, while a scallop, Mimachlamys varia, indicates nearby rocky substrate. The mako shark Isurus cf. oxyrhinchus is recorded in the area for the first time. The shark association represents a moderately warm environment as M. megalodon and Isurus are essentially temperate water dwellers, while no warm water form is known. Early Pliocene planktonic foraminifera point out to temperate to subtropical waters. Hence temperate to moderately warm conditions seem to have prevailed. |
format |
Article in Journal/Newspaper |
author |
Antunes, Miguel Telles Legoinha, Paulo Balbino, Ausenda Cáceres |
author_facet |
Antunes, Miguel Telles Legoinha, Paulo Balbino, Ausenda Cáceres |
author_sort |
Antunes, Miguel Telles |
title |
Megalodon, mako shark and planktonic foraminifera from the continental shelf off Portugal and their age |
title_short |
Megalodon, mako shark and planktonic foraminifera from the continental shelf off Portugal and their age |
title_full |
Megalodon, mako shark and planktonic foraminifera from the continental shelf off Portugal and their age |
title_fullStr |
Megalodon, mako shark and planktonic foraminifera from the continental shelf off Portugal and their age |
title_full_unstemmed |
Megalodon, mako shark and planktonic foraminifera from the continental shelf off Portugal and their age |
title_sort |
megalodon, mako shark and planktonic foraminifera from the continental shelf off portugal and their age |
publisher |
GeológicaActa |
publishDate |
2015 |
url |
http://hdl.handle.net/10174/17685 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
http://hdl.handle.net/10174/17685 migueltellesantunes@gmail.com pal@fct.unl.pt acaceres@uevora.pt 372 10.1344 |
op_rights |
openAccess |
_version_ |
1776203162436239360 |