Date: Mon, 29 Oct 2007 23:21:09 +1300
Reply-To: Conchologists List <CONCH-L@LISTSERV.UGA.EDU>
Sender: Conchologists List <CONCH-L@LISTSERV.UGA.EDU>
From: Andrew Grebneff <andrew.grebneff@STONEBOW.OTAGO.AC.NZ>
Subject: Re: Mystery Tennessee Fossil
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--></style><title>Re: [CONCH-L] Mystery Tennessee
Fossil</title></head><body>
<div>Sent again because it came back with encoding errors... would
someone like to tell me please if this is the second time it came
through?</div>
<div><br></div>
<div><br></div>
<div><br></div>
<blockquote type="cite" cite>I have a gal looking for a positive ID of
a fossil she found in the woods of Tennessee. Her Mystery Page
is located at: <a
href=
"http://www.manandmollusc.net/Mystery_shell_pages/Brett-mystery.html"
>http://www.manandmollusc.net/Mystery_shell_pages/Brett-mystery.html</a
></blockquote>
<div><br></div>
<div>The coiling is not correct for a planorbid (ramshorn) gastropod,
which is sinistral-hyperstrophic, giving the misleading appearance of
being dextral.</div>
<div><br></div>
<div>The rocks there are too old to be an ammonite, which appeared in
the Triassic. The oldest ammonoids, of which the ammonites are the
youngest group, appeared in the Devonian.</div>
<div><br></div>
<div>This shell is an internal mold or steinkern, possibly a nautiloid
in which the septa have not been preserved (rather unlikely) or
miore probably a monoplacophoran or a bellerophontoid gastropod, both
of which have bilaterally-symmetric shells.</div>
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