KTextinctions

KTextinctions - Death from Outer Space, Did an Asteroid...

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Unformatted text preview: Death from Outer Space, Did an Asteroid Impact Wipe out the Dinosaurs? The asteroid Gaspra - 7x7x12 miles A Gallery of Asteroids Was it really an asteroid? We must have multiple working hypotheses! Dinosaurs forgot to board the Ark K/T Boundary 65 MY Coal Age Age of Dinosaurs Geologic Time Scale K-T extinction record Wyoming The K/T impact clay layer, Gubbio, Italy. Iridium anomaly first found here. K = Cretaceous T = Tertiary K T Iridium anomaly in the K/T rocks at Gubbio, Italy, in parts per billion (PPB). K/T boundary 20 cm 10 cm 10 PPB The K/T boundary in New Mexico is marked by the white claystone just above the head of the hammer. Claire Belcher, Geology Department, University of London The white claystone layer marks the K/T boundary The K/T boundary in Spain Known distribution of sites with K/T Iridium anomaly Map of major impact sites in North America The Berringer Crater in Arizona, 50,000 years old....
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KTextinctions - Death from Outer Space, Did an Asteroid...

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