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Top : Science : Earth_Sciences : Paleontology : Extinction
  		• Cretaceous-Tertiary
  		• Permian-Triassic
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  		• Extinction: A number of extinction concepts are discussed and loosely defined, followed by a survey of some important extinction and "extinction-like" events, primarily from the Phanerozoic.
  		• Extinctions: Cycles of Life and Death Through Time: Covers patterns and periodicity of extinction, with discussions of major mass extinctions and minor extinction events.
  		• Mass Extinction: A mathematical model for mass extinction.
  		• The Late Devonian Mass Extinction: A professional technical paper discussing whether the Late Devonian (Frasnian-Famennian) mass extinction was initiated by an extraterrestrial impact or an earth-bound event.
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