And in other dinosaur news...

It just keeps getting more complicated.

In most parts of the world, the two bits that were assumed to come from the Chicxulub meteor impact, iridium and rock spherules, which form the KT-boundary, are virtually on top of each other. In Mexico, however, there's a meters-thick layer of sandstone between them, suggesting that there were about 300,000 years between two distinct meteoric events, in a one-two punch which wiped out dinosaurs. First one meteor impact, perhaps in India, and then the other in the Gulf of Mexico, 300,000 years apart.

Or so goes the new theory.

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