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Two hypotheses for the rate of deposition

Image caption:
Alvarez posed two hypotheses: either the clay was deposited over a few years and he would find no iridium, or over a few thousand years and the iridium would definitely be present.

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If you use this image in your own non-commercial project please credit it to the University of California Museum of Paleontology's Understanding Science (http://www.understandingscience.org).

 


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