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Did an asteroid really do in the dinosaurs?

It seems that every few years scientists challenge the story of how the dinosaurs’ 160-million-year reign came to an end, but now there are some compelling new theories.

For about 30 years, that’s been the story of how the dinosaurs’ 160-million-year reign came to an end. Now, two new controversial studies attempt to revise parts of this narrative.

The first, which appeared in the April 27 issue of Journal of the Geological Society, claims that, in fact, mass extinctions didn’t occur until perhaps 300,000 years after the asteroid impact.

The evidence: Marine sediments from around Mexico seem to show that 52 species present before the asteroid strike, a layer identified by blobs or spherules of melted glass, remained for quite some time after.

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