Decision on the Eocene-Oligocene boundary stratotype
نویسندگان
چکیده
منابع مشابه
Erosion and reworking of Pacific sediments near the Eocene- Oligocene boundary
[1] The Eocene-Oligocene (E/O) boundary interval marks one of the largest and most rapid changes in climate during the last 50 Myr. Because of a very shallow calcium carbonate compensation depth in the Eocene, as well as the reworking of sediments and hiatuses in the boundary zone, it has also been one of the most difficult stratigraphic boundaries to study in deep water marine sections, especi...
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The Eocene-Oligocene Boundary (~34 million years ago) marks one of the largest extinctions of marine invertebrates in the world oceans and of mammalian fauna in Europe and Asia in the Cenozoic era. A shift to a cooler climate across this boundary has been suggested as the cause of this extinction in the marine environment, but there is no manifold evidence for a synchronous turnover of flora, f...
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Diverse and extremely well-preserved assemblages of planktonic foraminifera were recovered from three drill holes through the Eocene/Oligocene boundary in southern Tanzania (Tanzania Drilling Project Sites 11, 12, and 17). The excellent state of preservation of the tests permits detailed investigation of wall textures and surface ornamentation, helping us to elucidate details of functional morp...
متن کاملin Tanzania Extinction and environmental change across the Eocene - Oligocene boundary
The Eocene-Oligocene transition (between ca. 34 and 33.5 Ma) is the most profound episode of lasting global change to have occurred since the end of the Cretaceous. Diverse geological evidence from around the world indicates cooling, ice growth, sea-level fall, and accelerated extinction at this time. Turnover in the oceanic plankton included the extinction of the foraminifer Family Hantkeninid...
متن کاملAntarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition.
About 34 million years ago, Earth's climate cooled and an ice sheet formed on Antarctica as atmospheric carbon dioxide (CO2) fell below ~750 parts per million (ppm). Sedimentary cycles from a drill core in the western Ross Sea provide direct evidence of orbitally controlled glacial cycles between 34 million and 31 million years ago. Initially, under atmospheric CO2 levels of ≥600 ppm, a smaller...
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ژورنال
عنوان ژورنال: Episodes
سال: 1993
ISSN: 0705-3797,2586-1298
DOI: 10.18814/epiiugs/1993/v16i3/002