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One For The Invert Expert Here!

#1 Rob Russell

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Posted 09 February 2010 - 01:50 AM

Here's a fossil that I only have found one of. I belive the sediment rock it's in is from the Ordovician period. I've looked around but haven't convinced myself as to what it is. Thanks for any responses!

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#2 erose

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Posted 09 February 2010 - 02:05 AM

I would venture two guesses: cephalopod or possibly a gastropod like Fusispira. Fusispira is slender and there appears to be a coiling suture line in the photo. There are also some cephalopods that are not quite straight and will have a slight twist or curve to them.

If Ordovician can you tell us the presumed age: Lower, Middle or Upper Ordovician?

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#3 Kentuckiana Mike

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Posted 09 February 2010 - 10:26 AM

Could it be a scaphopod mollusc like the Dentalium? The Index Fossils of North America book (pp. 520-523) shows fossils from the Ordovician Period and having a horn or tusk shaped shells.

Are there any other fossils in the rock with that fossil mold?

Were there any brachiopods or corals in the area where you found that fossil? They could be used to help determine the time period of this fossil.

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#4 Shamalama

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Posted 09 February 2010 - 11:09 AM

Ok, This is confusing me... is that Pyrite I see on the rock above the fossil? Can you get a better pic of the fossil and maybe a couple angles? I'm hesitant to say that it's a fossil at this point, but if I did I would agree with erose and say it was a Cephalopod. If Ordovician in age then it's too early for Belemites, but maybe an orthoceras or something?

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#5 paleobear

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Posted 09 February 2010 - 02:10 PM

It not looks like a scaphopoda at all, maybe a tracefossil?

Tommy

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#6 Rob Russell

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Posted 10 February 2010 - 08:48 AM

Yes Shamalama, thats definately pyrite on the rock. That's what originally drew my attention to the rock. Yes Kentuckian Mike, I've found a number of other fossils in the same stone that this one's from. Here's a few. Hope they'll help. Thanks again guy's for your knowledge.