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File:K-T-boundary.JPG

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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.
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Author Zimbres - Attribute it to Eurico Zimbres
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Date/TimeThumbnailDimensionsUserComment
current13:40, 8 January 2020Thumbnail for version as of 13:40, 8 January 20202,274 × 1,913 (967 KB)Soerfm (talk | contribs)Brightness, color
00:53, 14 September 2009Thumbnail for version as of 00:53, 14 September 20092,274 × 1,913 (891 KB)Zimbres (talk | contribs){{Information |Description={{en|1=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's Natural History Mus

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