See also:

• Science: Environment: Biodiversity  (885)
• Science: Environment: Climate Change: Impacts and Indicators: Animals  (10)
• Society: Future: Catastrophes  (36)

Animal Extinctions in the Fossil Record: A Developmental Paradigm  www.mprinstitute.org/vaclav/Develop.htm Article by Vaclav Petr discussing the possible causes of extinctions.

Extinction  www.peripatus.gen.nz/paleontology/extinction.html 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  park.org/Canada/Museum/extinction/homepg.html Covers patterns and periodicity of extinction, with discussions of major mass extinctions and minor extinction events.

The Late Devonian Mass Extinction  www.lpi.usra.edu/meetings/impact2000/pdf/3072.pdf A professional technical paper discussing whether the Late Devonian (Frasnian-Famennian) mass extinction was initiated by an extraterrestrial impact or an earth-bound event. [PDF]

Mass Extinction  www.lassp.cornell.edu/newmme/science/extinction.html A mathematical model for mass extinction.

Our Nemesis?  www.thekeyboard.org.uk/Our%20Nemesis.htm Article on a paper by David Raup and John Sepkoski, two respected paleontologists, making the remarkable claim that great catastrophes occur on the Earth every 26 million years,