I have found, as a rule of thumb, that modern shells are still shiny on the inside.  Fossil shells generally are dull or full of "dirt" on the inside.  Jack Donner  [log in to unmask]

>From: "M. McMahon" <[log in to unmask]>
>Reply-To: Conchologists of America List <[log in to unmask]>
>To: [log in to unmask]
>Subject: Bleached or Fossilized Shell
>Date: Tue, 24 Jun 2003 16:53:17 EDT
>
>Hello Conch-ler's,
>
>I was in Miami about two weeks ago and I found many different empty shells
>along the Rickenbacker Causeway. I am a novice collector so I am still a little
>shakey on the scientific names so forgive me if I use the common name. I
>believed I found an Atlantic Natica. It is difficult to determine because the
>shell appears to be bleached or fossilized. It is pure white on the inside and
>outside, I am able to make out the wavy patterns. It looks as though it may
>have a few layers that are chipped off. I know this may be a simple question but
>for future reference how can I tell the differnce between a fossilized shell
>and one that has been bleached by the sun? Can anyone recommend any books on
>fossilized shells? I appreciate your help.
>
>Thanks,
>
>Monique


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