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crinoid stem or tail section???


hndmarshall

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purchased online information unknown sorry they seemed to think it was a claw or perhaps a tail of some thing I am leaning more toward crinoid stem fossil.
not sure though have now found any online that have what looks like skin on them...interested in seeing what you people think.

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8 minutes ago, caldigger said:

Looks more like a straight cephalopod.

 

Is this from your Brazos River rock pile?

no some one was selling it online was no info on it really...the seller thought it was a tail portion or claw....but it looked off to me and it was odd so I bought it.

but it also looks a bit odd for a crinoid.

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I would say cephalopod too. The pattern on the surface could be the natural ornamentation of the shell. The larger dots. The other pattern looks a bit like bryozoa overlaying the cephalopod structure 

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Do you have age on it? This looks like Ordovician give or take a period.

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Here's a couple in my case, but I have never seen a specimen with the outer covering like that.

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I'm also inclined to say cephalopod Orthocone with bryozoan colony encrusted.

 

not 100% sure, but this could be the syphuncle showing:  

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do you have an idea of the age of those deposits?

 

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growing old is mandatory but growing up is optional.

 

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4 hours ago, KimTexan said:

I would say cephalopod too. The pattern on the surface could be the natural ornamentation of the shell. The larger dots. The other pattern looks a bit like bryozoa overlaying the cephalopod structure 

I think the dots are maculae in the bryozoan colony. They relate to current flow and feeding efficiency. 

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+1 for bryozoan encrusted cephalopod, that's really cool seen plenty of crinoid stems and once a brachiopod encrusted with bryozoans but never a cephalapod. 

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Nice, find, in all the meanings of that word.

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"On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry)

"We only well see with the heart, the essential is invisible for the eyes."

 

In memory of Doren

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To determine this structure close-ups are helpful. I can't identify the structure as being an encrusting bryozoan yet.

 

 

Best wishes,

Oliver

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9 minutes ago, Hubertus68 said:

To determine this structure close-ups are helpful. I can't identify the structure as being an encrusting bryozoan yet.

 

 

Best wishes,

Oliver

This identification is largely assisted from consideration of the context. There are a limited number of organisms with this general pattern in their geometry which would encrust in this manner.

Heliolitid coral has a similar habit and appearance but the dark areas would be sharply bordered circles. 

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