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Magnitude of Middle Miocene warming in North Pacific high latitudes: stable isotope evidence from Kaneharaia (Bivalvia, Dosiniinae)
Title
Magnitude of Middle Miocene warming in North Pacific high latitudes: stable isotope evidence from Kaneharaia (Bivalvia, Dosiniinae).
Creator
Oleinik, Anton E., Marincovich, Louie, Jr., Barinov, Konstantin B., Swart, Peter K.
Abstract/Description
The Middle Miocene Climatic Optimum (MMCO) at ~ 16 Ma was the warmest interval during the Neogene. The peak of the MMCO in the North Pacific is marked by the appearance of the bivalve genus Kaneharaia (Bivalvia, Dosiniinae) in the high-latitude regions of Kamchatka and Alaska (55 –65°N). Specimens of Kaneharaia sp. were collected from two early middle Miocene high-latitude localities in the North Pacific – the Sea urchin Horizon of northwestern Kamchatka and the Narrow Cape Formation of...
Show moreThe Middle Miocene Climatic Optimum (MMCO) at ~ 16 Ma was the warmest interval during the Neogene. The peak of the MMCO in the North Pacific is marked by the appearance of the bivalve genus Kaneharaia (Bivalvia, Dosiniinae) in the high-latitude regions of Kamchatka and Alaska (55 –65°N). Specimens of Kaneharaia sp. were collected from two early middle Miocene high-latitude localities in the North Pacific – the Sea urchin Horizon of northwestern Kamchatka and the Narrow Cape Formation of Alaska. Middle Miocene Kaneharaia specimens were incrementally sampled for oxygen and carbon stable isotope records of seasonality. Results were compared with stable isotope profiles constructed for two Recent species of Dosinia from subtropical waters.
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PURL
http://purl.flvc.org/fcla/dt/210410
Subject Headings
Biogeography--North Pacific Ocean, Mollusks, Fossils--North Pacific Ocean, Sediments (Geology)--North Pacific Ocean, Paleoclimatology--Miocene, Climatic changes--North Pacific Ocean
Format
Document (PDF)
A refined age for the earliest opening of Bering Strait
Title
A refined age for the earliest opening of Bering Strait.
Creator
Oleinik, Anton E., Gladenkov, Andrey Yu, Marincovich, Louie, Jr., Barinov, Konstantin B.
Abstract/Description
Biostratigraphically and chronostratigraphically important diatoms from the Milky River Formation, Alaska Peninsula, southwestern Alaska, imply an age range of 5.4-5.5 Ma for the oldest North Pacific Cenozoic occurrence of the marine bivalve mollusk Astarte, which migrated from the Arctic Ocean into the North Pacific when Bering Strait first flooded. The data presented here are a refinement of the age range of 4.8-5.5 Ma reported earlier and imply that Bering Strait first opened very near the...
Show moreBiostratigraphically and chronostratigraphically important diatoms from the Milky River Formation, Alaska Peninsula, southwestern Alaska, imply an age range of 5.4-5.5 Ma for the oldest North Pacific Cenozoic occurrence of the marine bivalve mollusk Astarte, which migrated from the Arctic Ocean into the North Pacific when Bering Strait first flooded. The data presented here are a refinement of the age range of 4.8-5.5 Ma reported earlier and imply that Bering Strait first opened very near the end of the Miocene at 5.32 Ma.
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PURL
http://purl.flvc.org/fau/165902
Subject Headings
Paleoecology--Bering Sea Region, Diatoms, Fossil--North Pacific Region, Geology, Stratigraphic--Miocene, Paleoceanography--North Pacific Region, Mollusks, Fossil--Arctic Ocean
Format
Document (PDF)