Annotated index and bibliography of the calcareous nannoplankton VI

Loeblich, Alfred R.; Tappan, Helen

doi:10.2216/i0031-8884-10-4-315.1

Cited by 51 publications

(31 citation statements)

References 2 publications

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“…Bibliographic references for these taxa can be found in Loeblich and Tappan (1966, 1970a, 1970b, 1971, 1973, Heck (1979a, 1979b, 1980a, 1980b, 1981a, 1981b, 1982a, 1982b), or Steinmetz (1985a, 1985b, 1986, 1987a, 1987b, 1988a, 1988b.…”

Section: °Fmentioning

confidence: 99%

Paleoceanographic Implications of Eocene-Oligocene Calcareous Nannofossils from Sites 711 and 748 in the Indian Ocean

Wei¹,

Villa²,

Wise³

1992

Proceedings of the Ocean Drilling Program

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An Eocene-Oligocene calcareous nannofossil biostratigraphic framework for Ocean Drilling Program (ODP) Site 748 in the southern Indian Ocean is established, which provides a foundation for this and future quantitative biogeographic studies. This biostratigraphic analysis, together with quantitative nannofossil data, enables a reinterpretation of the preliminary magnetostratigraphy and a new placement for magnetic Subchron CBN in the lowermost Oligocene.Calcareous nannofossil species diversity is low at Site 748 relative to lower latitude sites, with about 13 taxa in the middle Eocene, gradually decreasing to about 6 in the late Oligocene. There is, however, no apparent mass extinction at any stratigraphic level. Similarly, no mass extinctions were recorded at or near the Eocene/Oligocene boundary at Site 711 in the equatorial Indian Ocean. Species diversity at the equatorial site is significantly higher than at Site 748, with a maximum of 39 species in the middle Eocene and a minimum of 14 species in the late Oligocene. The abundance patterns of nannofossil taxa are also quite different at the two sites, with chiasmoliths, Isthmolithus recurvus, and Reticulofenestra daviesii abundant and restricted to the high-latitude site and Coccolithus formosus, discoasters, and sphenoliths abundant at the equatorial site but impoverished at the high-latitude site. This indicates a significant latitudinal biogeographic gradient between the equatorial site and the high-latitude site in the Indian Ocean for the middle Eocene-Oligocene interval.The abundance change of warm-water taxa is similar to that of species diversity at Site 711. There is a general trend of decreasing abundance of warm-water taxa from the middle Eocene through the early Oligocene at Site 711, suggesting a gradual cooling of the surface waters in the equatorial Indian Ocean. The abundance of warm-water taxa increased in the late Oligocene, in association with an increase in species diversity, and this may reflect a warming of the surface waters in the late Oligocene.An abrupt increase in the abundance of cool-water taxa (from -20% to over 90%) occurred from 36.3 to 35.9 Ma at high-latitude Site 748. Coincident with this event was a ~ 1.0 %o positive shift in the δ 18 θ value of planktonic foraminifers and the occurrence of ice-rafted debris. This abrupt change in the nannofossil population is a useful biostratigraphic event for locating the bottom of magnetic Subchron C13N in the Southern Ocean. The sharp increase in cool-water taxa coeval with a large positive shift in δ'8 O values suggests that the high-latitude surface waters drastically cooled around 36.3-35.9 Ma. The temperature drop is estimated to be 4°C or more at Site 748 based on the nannofossil population change relative to the latitudinal biogeographic gradient established in the South Atlantic Ocean during previous studies. Consequently, much of the δ 18 θ increase at Site 748 appears to be due to a temperature drop in the high latitudes rather than an ice-volume signal. The ~0.1%e δ 1...

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Section: °Fmentioning

confidence: 99%

Paleoceanographic Implications of Eocene-Oligocene Calcareous Nannofossils from Sites 711 and 748 in the Indian Ocean

Wei¹,

Villa²,

Wise³

1992

Proceedings of the Ocean Drilling Program

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“…Most of the bibliographic references for these taxa are presented in Loeblich and Tappan (1966, 1970a, 1970b and in van Heck (1979avan Heck ( , 1979bvan Heck ( , 1980avan Heck ( , 1980bvan Heck ( , 1981avan Heck ( , 1981bvan Heck ( , 1982avan Heck ( , 1982b. Any references not found therein are listed in the references of this chapter.…”

Section: Introductionmentioning

confidence: 99%

Cretaceous Calcareous Nannofossils from Deep Sea Drilling Project Leg 77, Southeast Gulf of Mexico

Watkins¹,

Bowdler²

1984

Initial Reports of the Deep Sea Drilling Project

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Five of the six sites drilled during Leg 77 of the Deep Sea Drilling Project yielded Cretaceous sediments. Two of these sites, 535 and 540, form a composite section that spans the upper Berriasian through most of the Cenomanian. Olive black marly limestones in this interval yield relatively rich, well-preserved nannofossil assemblages that allow biostratigraphic subdivision of the sequence. This composite section provides important information on the Early Cretaceous history of the Gulf of Mexico, as well as additional information on tropical Lower Cretaceous nannofossil assemblages. The post-Cenomanian nannofossil (and sedimentary) record is limited to a thin, condensed section of Santonian through lower Maestrichtian pelagic sediments at one site (538) and is absent or represented by redeposited material at the other sites. Two new genera, Perchnielsenella and Darwinilithus, are described. Two new taxa, Darwinilithus pentarhethum and Lithraphidites acutum ssp. eccentricum, are described; and two new combinations, Rhagodiscus reightonensis and Perchnielsenella stradneri, are proposed.

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“…Bibliographic references for these taxa can be found in Loeblich and Tappan (1966, 1969, 1970a, 1970b, Heck (1979a, 1979b, 1980a, 1980b, 1981a, 1981b, 1982a, 1982b, 1983), or Steinmetz (1985a, 1985b, 1986, 1987a, 1987b, 1988a, 1988b. Stratigraphically important occurrences and selected species are illustrated in Plates 1 and 2.…”

Section: Methodsmentioning

confidence: 99%

Oligocene-Pleistocene Calcareous Nannofossils from Southern Ocean Sites 747, 748, and 751

Wei¹,

Wise²

1992

Proceedings of the Ocean Drilling Program

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Annotated index and bibliography of the calcareous nannoplankton VI

Cited by 51 publications

References 2 publications

Paleoceanographic Implications of Eocene-Oligocene Calcareous Nannofossils from Sites 711 and 748 in the Indian Ocean

Paleoceanographic Implications of Eocene-Oligocene Calcareous Nannofossils from Sites 711 and 748 in the Indian Ocean

Cretaceous Calcareous Nannofossils from Deep Sea Drilling Project Leg 77, Southeast Gulf of Mexico

Oligocene-Pleistocene Calcareous Nannofossils from Southern Ocean Sites 747, 748, and 751

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