Image: K-T-boundary

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Description: 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.
Title: K-T-boundary
Credit: Own work
Author: Zimbres - Attribute it to Eurico Zimbres
Permission: Free for all use
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes

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