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26 April, 15:20

Why did scientists FIRST hypothesize that a meteorite impact caused the extinction at the K-Pg Boundary (the end of the dinosaurs; note that this boundary used to be referred to as the K-T boundary and earlier versions of the book use this convention) ?

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  1. 26 April, 16:58
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    They found evidence of iridium deposits in a clay layer that led them to believe that the layer formed quickly, possibly after an impact.
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