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...The outcome is very unclear. Who would like to gamble?
Exactly what period and what marine organisms were you referring to Bass? The Cretaceous? "Was a period with a relatively warm climate and high eustatic sea level. The oceans and seas were populated with now extinct marine reptiles, ammonites (extinct mollusks) and rudists (sort of reef-builders); and the land by dinosaurs." Cretaceous period I'm not sure what you are referring to here?"The beginning of the Mesozoic Era there was a depleted ecosystem world-wide. Many of the old life forms had just gone extinct in the Permian Extinction (248 millions y ago) , the world's largest mass extinction. The Mesozoic Era lasted about 180 million years, and is divided into three periods, the Triassic (first true mammals), the Jurassic, and the Cretaceous. " Are you thinking of sharks? Then there are extinct variants of course like Ichthyosaurs (similar to dolphins) and mosasaurs who seemed to have looked like eels. Then you had ostracoderms (jawless fish) etc?If you mean that even though our era of 'man' might die, life in itself won't? Then I'm with you I too think that Earth has proved that enough times..And it's like Geezer points out, the slower the better. If it goes to fast the fauna and flora might become too stressed, not able to migrate in time. But it's still an open question how fast it might be.