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File:K-T-boundary.JPG

Summary

Description
English: The intermediate claystone layer contains 1000 times more iridium than the upper and lower layers. It is the boundary between Cretaceous and Tertiary Periods. Picture taken by the author at San Diego Natural History Museum. The rock is from Wyoming, USA.
Date August 2009
Source Own work
Author Zimbres - Attribute it to Eurico Zimbres
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