Date: Mon, 29 Oct 2007 09:23:50 -0500
Reply-To: Conchologists List <CONCH-L@LISTSERV.UGA.EDU>
Sender: Conchologists List <CONCH-L@LISTSERV.UGA.EDU>
From: Deborah Duval <Deborah.Duval@NICHOLLS.EDU>
Subject: Re: Mystery Tennessee Fossil
In-Reply-To: <f0510030dc34b644890df@[218.101.117.116]>
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Andrew--I received both sendings.
Debbie Duval
>>> Andrew Grebneff <andrew.grebneff@STONEBOW.OTAGO.AC.NZ> 10/29/2007 5:21 AM >>>
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?
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: http://www.manandmollusc.net/Mystery_shell_pages/Brett-mystery.html
The coiling is not correct for a planorbid (ramshorn) gastropod, which is sinistral-hyperstrophic, giving the misleading appearance of being dextral.
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.
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.
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