Re: K/T revisited, was: Re: DINOSAUR digest 3382

[Denver Fowler <df9465@yahoo.co.uk>]

--- Phil Bigelow <bigelowp@juno.com> wrote:

> > > What about that survive/extinction pattern if we
> look at the marine
> > biota? Sharks survived, marine reptiles don't.
> > Ammonites go 
> > extinct,
> > squids don't.
> 
> 
> Peter Ward (and others) believes that ammonites went
> extinct because they
> bred/fed at shallow depths.  In contrast, he claims
> that nautaloids
> survived because they bred/fed in deeper water.  I'm
> don't know what his
> take is on squids and octopus.
> 
> The hypothesis is that the deeper depths were
> "buffered" from the carnage
> that was occurring in the near-surface marine
> waters.  This idea is
> supported by the observation that Maastrichtian
> benthic biota tended to
> fare a little better than did their pelagic
> counterparts.
>


Or it could be something to do with a major marine
regression that occurred prior to and continuing
though the K-T. 

D

> <pb>
> --
> 
> 
> 



                
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