Dinosaur Extinction > Asteroid Impact Theory

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Alvarez Asteroid Impact Theory - Offers an overview of the Alvarezs' K-T (Cretaceous-Tertiary) extinction theory.
Catastrophism and Mass Extinctions - List web pages discussing the mass K-T boundary extinction event as well as others before and since.
Impact Theory of Mass Extinction - Lecture notes of Professor Paul Eric Olsen, Columbia University.

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