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K-T Boundary [1]
USA

The K-T Boundary marks a transition in geologic time from the Cretaceous to Tertiary periods.  It is most famous for having a thin layer of iridium rich material which is theorized to have caused the famous dinosaur extinction 65 million years ago.  The K-T Boundary is found all over the world is certain areas, this one being a very pronounced thin layer of claystone visible in the roadcut.

Copyright: Pix
Type: Spherical
Resolution: 13200x6600
上传: 09/04/2013
更新: 23/04/2013
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