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Mystery Crinoids


Mochaccino

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Hello,

 

A while ago I bought this small crinoid piece labeled as "Gilbertocrinus sp." coming from Dent, Ohio. The main crown on the front is small at just over 2cm, and there is also one calyx on the backside. I suspect the genus is a typo for Gilbertsocrinus. However it does not resemble any Gilbertsocrinus I know, lacking tegmenal appendages and calyx spines. Instead I was told by a very knowledgeable collector that it resembles Pycnocrinus, an ordovician genus. More importantly, I was told that the locality of Dent, Ohio is Ordovician-aged, no Mississipian or even Devonian. So it seems the locality and ID I have for this is up in the air.
 

Does the piece seem familiar or identifiable to any one? I'd appreciate any help, thank you.

 

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Edited by Mochaccino
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25 minutes ago, TheInvertebrateGuy said:

Looks like a Pycnocrinus dyeri from the lower Ordovician of Ohio.

 

That was fast, thank you again! So +1 for Pycnocrinus, and P. dyeri does seem to check out at the species level, according to this source: http://drydredgers.org/crinoids_monobathrida.htm. Do you think the location is likely to be Ohio based on appearance or could it also be from a completely different locality such as Kentucky? I'm not 100% on the distribution for these species or if the preservation/matrix is deterministic enough.

 

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20 hours ago, Mochaccino said:

 

Do you think the location is likely to be Ohio based on appearance or could it also be from a completely different locality such as Kentucky? I'm not 100% on the distribution for these species or if the preservation/matrix is deterministic enough.

 

I’m definite that this fossil comes from the Arnheim Formation near Dent, Ohio, since Pycnocrinus dyeri are commonly found from there. The limestone it is in makes it an upper Ordovician specimen, respectively.

Edited by TheInvertebrateGuy
Accidental typo.
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7 minutes ago, TheInvertebrateGuy said:

I’m definite that this fossil comes from the Arnheim Formation near Dent, Ohio, since Pycnocrinus dyeri are commonly found from there. The limestone it is in makes it a lower Ordovician specimen, respectively.

 

Oh I see, thank you very much for the detailed identification! It would've been a sad thing to have a fossil without ID/locality information.

Edited by Mochaccino
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6 hours ago, TheInvertebrateGuy said:

I’m definite that this fossil comes from the Arnheim Formation near Dent, Ohio, since Pycnocrinus dyeri are commonly found from there. The limestone it is in makes it a lower Ordovician specimen, respectively.

I believe Arnheim is Upper Ordovician, not lower.

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17 hours ago, minnbuckeye said:

I believe Arnheim is Upper Ordovician, not lower.

 

Oh I see, thank you for the info!

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