Nobody knows the answer to this, but it is worth seeing what others think.
Ammonites were the totally wiped out by whatever caused the extinction of the dinosaurs. Ammonites were those round, spiral shelled molluscs that prior to the extinctions swarmed in the oceans by the billions. There are fossils of them an inch across, and others 4 feet across. They were incredibly successful, and the hundreds of different species existed for hundreds of millions of years.
But they all disappeared 65 million years ago when the dinosaurs went. Not one is left. Not even a descendant. At least they think the dinosaurs gave rise to birds.
Then if the event, whatever it was, could kill off all these fairly small sea creatures, how come huge sharks survived in the same oceans? Lots of other shellfish survived. Why were these ones wiped out?
In its way, it is a much bigger mystery than the dinosaurs. It is just that we find dinosaurs much more exciting creatures.
2006-08-28
09:38:38
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4 answers
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asked by
nick s
6