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Effects of Past Global Change on Life (1995) / Chapter Skim
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Pages 47-47

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From page 47...
... Within 520,000 yr of the C-T boundary, nontropical late Cenomanian biotas experienced 45-75~o species extinction, depending on the group, through a series of discrete, ecologically graded, short-term events, or steps, beginning with subtropical and warm temperate stenotopic biotas, and terminating with more broadly adapted cool temperate biotas. These extinction events were closely linked or coeval with abrupt, large-scale perturbations in the ocean-climate system, as evidenced by major fluctuations in trace elements (including Ir)
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Key Terms

  • trace element
  • late cenomanian
  • extinction interval
  • extinction events
  • mass extinction

  • trace elements
  • adaptive ranges
  • oceanic oxygen
  • element advection
  • narrow adaptive

  • anoxic event
  • epicontinental sea
  • impact shower
  • ecologically graded
  • progressively exceeded

  • organic carbon
  • environmental changes
  • extinction event
  • oceanic anoxic
  • cenomanian impact

  • oxygen minima
  • carbon values
  • stable isotope


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