Extinction

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

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.
www.peripatus.gen.nz/paleontology/extinction.html

Extinctions: Cycles of Life and Death Through Time - Covers patterns and periodicity of extinction, with discussions of major mass extinctions and minor extinction events.
park.org/Canada/Museum/extinction/homepg.html

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. [PDF]
www.lpi.usra.edu/meetings/impact2000/pdf/3072.pdf

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