Effects of Past Global Change on Life (1995) / Chapter Skim
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Pages 87-89
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From page 87... ...
This rate of extinction is similar to that of Paleocene to Middle Eocene floras in general. Because of the present ambiguity in determining whether Cretaceous species in basal Tertiary deposits are reworked or in situ, an accurate estimate of the effect of the K/T crisis based on nannoplankton cannot be obtained.
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From page 88... ...
Because stable isotope ranking of Cretaceous species is still preliminary and awaiting further analyses of individual species, Table 4.1 groups by genera. However, future isotope analyses may show that not all species within a genus inhabited the same depth environment, or that some species calcified their shells in disequilibrium with the seawater in which they grew.
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From page 89... ...
, but large-scale volcanism and mantle plume activity may also have been contributing factors. However, the considerably smaller mass extinction in planktic foraminifera than generally assumed suggests that the effects of a halide impact on marine plankton would have been significantly less catastrophic than proposed by current theory.
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