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In a message dated 11/26/99 5:07:26 AM EST, darren.naish@port.ac.uk writes:

<< Had these giant sauropods _recovered_ from an end-J extinction, or 
 was the J-K transition not really that severe? >>

The idea is that across the J-K boundary large sauropods became extinct, then 
different large forms reevolved from the smaller survivors as the Cretaceous 
unfolded. This is evidently what Bakker has concluded from his Morrison work. 
There is also an apparent unrelated mid-Cretaceous sauropod extinction in 
North America.