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Extinction - specific info

I'm still looking for specific information regarding extinctions in
the Cretaceous.....

In particular, I'm interested in specific species that thrived (?) in
the early Cretaceous, but went extinct BEFORE the end of the
Cretaceous, and any theories as to why that particular species didn't

This is part of a training course, so I don't need alot of depth, but
I do want accurate, and updated information.


Michelle Baker - Philadelphia