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Ha Ha!
The KT mass extinction boundary
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KT (Cretaceous Tertiary) Boundary
• Layer exists simultaneously world wide
• Layer marks the transition from the Mesozoic era to the Cenozoic
• Layer Marks the transition from the Cretaceous to the Tertiary
• Layer had 30-130 times the normal amount of the element Iridium
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Alvarez impact hypothesis
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Devastation Sequence
• Asteroid impacts Earth
• Ejecta is sent into atmosphere
• Material blocks sunlight for months to years
• Impact crater and fallout layer are the only evidence
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Chicxulub
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Chicxulub
• The crater is buried under the tip of the Yucatan peninsula
• Crater is 110 miles wide
• Crater is 65.5 millions years old
• Crater is named after the Mayan word for (Tail of the Devil)
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Chicxulub Gravity Anomaly
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Other Theories
• Deccan Traps
• Sea level Regression
• Multiple impacts
• Multiple events
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The Deccan traps
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Deccan Traps
• South West India
• Area 500,000sqkm
• 2000m thick
• May have lasted 30,000 years
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Maastrichtian sea-level regression
• Reduction of continental shelf area
• Reefs and Plankton my have been seriously damaged
• Epeiric seas would have disappeared
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Multiple Events
• Extinction was gradual and involved the loss of species and genera.
• Dinosaurs, air and marine reptiles were picked off by a combination of all these sequential events.
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State of the art re-creation
• http://www.youtube.com/watch?v=p0aHXSmCstk