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SlideshowReport

Iridium-Rich Layer of Clay

Description
Iridium-Rich Layer of Clay
This photograph of strata in the Apennine Mountains of Italy
shows a dark-colored layer of iridium-rich clay sandwiched
between white limestone (bottom) from the late Mesozoic
era and grayish limestone (top) from the early Cenozoic era.
The coin is the size of a U.S. quarter.
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