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Key terms: impact crater mi chicxulub ft dinosaur penfield layer rocks pemex whyy clay impactor extinction asteroid samples suggested iridium argue kilometers basin boundary glen dust geology hildebrand cenote diameter atmosphere depth comet sinkholes bakker fragment impact crater same time chicxulub crater tektite gravity impact feature collision caribbean chicxulub impact postulated shocked quartz extinction event death of the dinosaur million years ago walter alvarez sulfate aerosols Search external links cited by footnotes on Wikipedia page Chicxulub crater: |
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