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Lecture 21: Impacts and Extinction
We end our exploration of life on the Earth with a look at death in the
fossil record. This lecture looks at the role asteroidal impacts have
played in the history of the Earth, and their possible role in mass
extinction events in the fossil record. We will discuss near-earth
asteroids, historical impacts, and the K-T event in which a massive
asteroid impact caused a mass extinction of species that included all
non-avian dinosaurs among its victims, opening up the biosphere to the
dominance of mammals. We'll look at other mass extinctions during the
past 500Myr, and talk about whether extinction-class impacts are in our
future. Recorded live on 2009 Oct 22 in Room 1005 Smith Laboratory on
the Columbus campus of The Ohio State University.
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By Richard PoggeWe end our exploration of life on the Earth with a look at death in the
fossil record. This lecture looks at the role asteroidal impacts have
played in the history of the Earth, and their possible role in mass
extinction events in the fossil record. We will discuss near-earth
asteroids, historical impacts, and the K-T event in which a massive
asteroid impact caused a mass extinction of species that included all
non-avian dinosaurs among its victims, opening up the biosphere to the
dominance of mammals. We'll look at other mass extinctions during the
past 500Myr, and talk about whether extinction-class impacts are in our
future. Recorded live on 2009 Oct 22 in Room 1005 Smith Laboratory on
the Columbus campus of The Ohio State University.
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