The first finds of cretaceous belemnites from the Magellan Rise, Pacific Ocean |
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| Authors: | Yu D Zakharov S P Pletnev M E Mel’nikov O P Smyshlyaeva V D Khudik G A Evseev T A Punina P P Safronov A M Popov |
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| Institution: | (1) Far East Institute of Geology, Far East Division, Russian Academy of Sciences, Vladivostok, Russia;(2) Pacific Institute of Oceanology, Far East Division, Russian Academy of Sciences, Vladivostok, Russia;(3) Research Institute Okeangeofizika, Federal Scientific, Center Yuzhmorgeologiya, Gelendzhik, Russia;(4) Institute of Marine Biology, Far East Division, Russian Academy of Sciences, Vladivostok, Russia |
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| Abstract: | The occurrence of belemnites in Mesozoic sediments of the Pacific guyots is established for the first time (rostra Dimitobelidae gen. et sp. indet. from the late Campanian-Maastrichtian detrital limestone of the DVGI Guyot, Belemnitella? sp. from oolitic limestone of the Gelendzhik Guyot, which are presumably of the Santonian-Maastrichtian age, and Belemnitidae? gen. et sp. indet. from the Maastrichtian oolitic limestone of the Butakov Guyot, the Magellan Rise). In recent years, fossil cephalopods important in stratigraphic and paleobiogeographic aspects have been found at five guyots of that rise. New data on fossil invertebrates from the study region suggest breaks in the sedimentation here at the terminal Maastrichtian, Paleogene, and initial Neogene time. Possible limits of vertical migration in the tropical Pacific are estimated for the Late Cretaceous belemnites based on preliminary results of the oxygen isotope analysis. |
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| Keywords: | mollusks foraminifers corals Upper Cretaceous oxygen and carbon isotopes belemnite migration Magellan Rise Pacific Ocean |
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