Re: paleonet Systematics surprisingly interesting Pt.II

[John Jackson <strangetruther@xxxxxxxxx>]

Hi Michael -

A gradual decrease in size of land animals is not I
think what is observed.  Any such signal is overlain
by huge switchbacks.  Actually, by looking at the legs
of large animals of similar lifestyles down the ages I
agree we could get evidence one way or another - and I
would guess it would not point to EE.

Thanks for your contrib.

Cordially, 

JJ

--- Michael Kishel <mike@houseofshred.net> wrote:

> This isn't exactly my field so I could be thinking
> incorrectly but I thought
> I would ask.  Doesn't the fact that the overall size
> of animals across the
> time period in question decreasing in size generally
> support this idea of
> the earths mass increasing substantially (i.e. more
> mass = greater
> gravitation)?  Again forgive me if my thinking isn't
> quite on as this is not
> my area.  It would seem to me from a biomechanical
> perspective (my area)
> that increasing gravitation would favor the
> evolution of smaller animals.
> The only way that I can think of to increase
> gravitation would be an
> increase in mass.  If true then this could provide
> some insight into the
> extinction of the very large animals.  Does this
> support the theory that you
> are talking about or am I on the wrong track
> altogether?
> 
> -Michael Kishel
> 
> ----- Original Message ----- 
> From: "John Jackson" <strangetruther@yahoo.com>
> To: <paleonet@nhm.ac.uk>
> Sent: Sunday, October 02, 2005 10:56 AM
> Subject: paleonet Systematics surprisingly
> interesting Pt.II
>
[snip]


		
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