This Smithsonian Magazine site provides an introductory level summary of the discovery of the Chicxulub impact site. The article describes geologic evidence used to interpret the impact structure and the implications these have for the Cretaceous/Tertiary mass extinction. Other topics include the extinction of dinosaurs, tsunami waves, wildfires, shocked quartz, impact melt rocks, impact breccias, and the use of subsurface geophysical and drill core data.
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