John,
You may have an internal view of the upper portion of the shell, with the
rest of the tube broken away.  Possibly the lower half of the shell was
much thinner and more easily lost.

Allen Aigen  NYC
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On Thu, 19 Aug 2004 22:32:33 -0500 John Foust <[log in to unmask]>
writes:
> I give talks to school children about the fossils of the
> Ordovician here in Wisconsin and encourage them to bring
> fossils for identification.  One brought a stumper a few
> weeks ago.
>
> A curator at the Milwaukee Public Museum sent a photo
> of a similar specimen they'd identified as Gonioceras kayi.
> Another cephalopod expert suggested it was a flat section
> through the shell.  I'm not convinced yet...
>
> Pictures of both fossils can be found at this page:
>
> http://www.threedee.com/jmosn/fossils/gonio/index.html
>
> Any assistance or pointing in the right direction will
> be gratefully accepted!
>
> - John
>
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