Until now, it has been accepted generally that the Chicxulub impact off the coast of Mexico 65-million years ago wiped out the dinosaurs. Evidence of the crater left by the giant asteroid or comet has been found under the sea off the coast of Yucatan.
But a group of scientists led by Professor Gerta Keller of Princeton and Professor Wolfgang Stinnesbeck of the University of Karlsruhe begged to differ. They uncovered a series of geological clues which suggests the truth may be far more complicated.
They seem to be blaming it largely on the Deccan flood basalts in India and imply that another impact caused those, with Chicxulub perhaps weakening many species. One would think an Indian crater of that size would have been found by now.