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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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Looks more like a straight cephalopod.

 

Is this from your Brazos River rock pile?

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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 

0A45A409-A9EC-4BC0-93F8-92DE123CE81D.jpeg.a878c8a4c54ed89ae8e3d90756ab3eae.jpeg

 

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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Orthocone naughtlus with encrusting bryozoan.

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Manticocerasman

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

 

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

orthocone.PNG.943dbabab5b7909d10c28b7ffc5ca624.PNG

 

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

 

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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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Another vote here for cephalopod with bryozoan incrustaton.

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hndmarshall, seems you just bought yourself a good conversation starter. :)

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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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fifbrindacier

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

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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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