- Alvarez Asteroid Impact Theory
Offers an overview of the Alvarezs' K-T (Cretaceous-Tertiary) extinction theory.
www.zoomdinosaurs.com/subjects/dinosaurs/glossary/Alvarez.shtml
- Catastrophism and Mass Extinctions
List web pages discussing the mass K-T boundary extinction event as well as others before and since.
www.pibburns.com/catastro/extinct.htm
- Impact Theory of Mass Extinction
Lecture notes of Professor Paul Eric Olsen, Columbia University.
rainbow.ldeo.columbia.edu/courses/v1001/impact23.html
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