Jen (ylla) wrote,

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Boundary confusion

I am confused about the K-T boundary.

The idea of a meteorite impact came from finding a layer of iridium in between the Cretaceous and Tertiary rocks - but if the rocks are defined by the fossils they contain, then I can't understand how it works, because shouldn't there be lots of dead dinosaurs and ammonites and things *after* the impact - and then how can those rocks be Tertiary, with Cretaceous organisms in them?

I should go and ask this on the course forum, only I don't want to look daft :)
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