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Fwd: New dino eggs (was Dinos



Hi

We had a very long dicussion on dinosaur egges and acceptable thinknesses and
all that.  I even put in my two cents worth.  But I lost all that
correspondence in a wipeout. Does anyone have all that so as to get those
thoughts into this discussion without going all through it again.

paul sparks

---------------------
Forwarded message:
>From:  NCLARK@museum.gla.ac.uk (Neil Clark)
Sender: dinosaur@lepomis.psych.upenn.edu
Reply-to:       NCLARK@museum.gla.ac.uk
To:     dinosaur@lepomis.psych.upenn.edu (Multiple recipients of list)
Date: 95-08-23 09:49:15 EDT

                  From the Desk of Chrysalis
>  RE>New dino eggs (was Dinosaur news stories)
> >"Most were greenish grey, but a few are greyish black," the report said.
> >The shells were fairly thin, measuring between .0156 cms

[inches??]

>> (0.4 mm) and .0312
> >cms (0.8 mm) in thickness while a layer of membrane was found beneath the
> >shell's surface.
> 
Then Chris wrote.....

> There was a discussion on egg shell thickness a while back. With egg shells
> this thin I don't see how it could have been a hard shell and been strong
> enough. It seems to me these thin shells (and not necessarily other dino
> eggs) must have been a more leathery type like current reptiles.
> 
> 

I think that 0.4- 0.8 mm is reasonably thick for the egg shell.  I'm 
not sure how thick an ostrich egg is offhand, but I suspect that it 
is of comparable thickness.  There may have been a little bit of 
pressure solution, or calcium up-take by the growing embryo, that could 
have caused a thinning of the shell also.

Neil