psiloceras planorbis (Ammonite Fossil)
A large and wondrous fossil specimen, seen in the booth for Chris Moore at the Arizona Mineral &amp; Fossil Show in Tucson, Arizona.  This capture was in available light inside a vendor booth at the Ramada Ltd.  I've never seen such fossils and certainly never knew that the ammonites I have collected for years had their earliest ancestor in these.  The ammonites evolved into squid and mollusks.   The identification labels these as &quot;Lower Lias, lower Jurassic&quot;.The slabs were found in Somerset, England in shale.  The colors are natural and there is only a bit of varnish to protect the nacre which is iridescent and glows.  For more about this specimen, see the link below for the psiloceras planorbis:

<a href="http://www.severnichthys.co.uk/fossil04.htm" rel="noreferrer nofollow">www.severnichthys.co.uk/fossil04.htm</a>

Another link to a specimen:
<a href="http://www.fossilwalks.com/ammonites/pages/psilo.htm" rel="noreferrer nofollow">www.fossilwalks.com/ammonites/pages/psilo.htm</a>


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