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- W2025707219 abstract "Semi-quantitative methods have been used to refine the precision with which Pliocene and early Pleistocene nannofossil datums may be applied for biostratigraphic purposes. Using these methods, the datums may be applied with a precision of between 0.01 m.y. (e.g.Calcidiscus macintyrei andDiscoaster brouweri) and 0.2 m.y. (e.g.Discoaster asymmetricus). The age of each datum is estimated by interpolation between magnetic reversals, so that the uncertainty in each age estimate is a function of proximity to the nearest reversal as well as of uncertainties in the reversal chronology but is probably better than 0.1 m.y. for all the datums studied here. The following ages are estimated for biostratigraphically useful datums: LADHelicosphaera sellii, 1.37 Ma (diachronous; earlier outside the equatorial zone); LADCalcidiscus macintyrei, 1.45 Ma; LADDiscoaster brouweri, 1.88 Ma; LADDiscoaster asymmetricus, 2.2 Ma; LAD DisDiscoaster pentaradiatus, 2.35 Ma; LADDiscoaster surculus, 2.41 Ma; LADDiscoaster tamalis, 2.65 Ma; LADDiscoaster variabilis, 2.90 Ma; LADSphenolithus spp., 3.45 Ma; LADReticulofenestra pseudoumbilica, 3.56 Ma; LADAmaurolithus delicatus, 3.66 Ma; FADCeratolithus rugosus, 4.62 Ma. The final 0.15 m.y. of the range ofDiscoaster brouweri is characterised by a high (about 20%) proportion of the triradiate form, which is a useful pointer for the extinction of this species even in the presence of considerable reworking." @default.
- W2025707219 created "2016-06-24" @default.
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- W2025707219 date "1983-09-01" @default.
- W2025707219 modified "2023-10-18" @default.
- W2025707219 title "Quantitative biochronology of Pliocene and early Pleistocene calcareous nannofossils from the Atlantic, Indian and Pacific oceans" @default.
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- W2025707219 doi "https://doi.org/10.1016/0377-8398(83)90009-9" @default.
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