Crinoid ID?

[Jackalope122]

Hello all, I'm asking for your help again! Can anyone confirm if this roughly 1.5mm fossil impression is a type of star shaped crinoid stem piece? That's my guess. It was found near Graf, Iowa from the maquoketa formation, upper Ordovician. It's on the backside of a piece of matrix that has some trilobite debris on it and I thought it was neat. Thanks for your help!

[ynot]

Looks like a piece of the calyx to Me.

[Auspex]

11 minutes ago, ynot said:

Looks like a piece of the calyx to Me.

I can see that: bottom side of a crinoid calyx.

[Jackalope122]

That's a first for me then, pretty cool! Thanks guys

[Fossildude19]

I'm not sure - it looks like it could just be a columnal, to me.   

Cropped, contrasted and enlarged.

 

 

    

[Tidgy's Dad]

I think calyx plate too.

Nice little find! 

[abyssunder]

There are not enough details, but in my opinion, it's a crinoid columnal imprint.

(Isocrinidae)

Edited May 22, 2018 by abyssunder

[Auspex]

To illustrate my thinking:

Note the five-fold symmetry.

[Jackalope122]

Yea I apologize for the image quality, it's so small I tried taking it through my magnifying eye piece. I appreciate everyone's input!

[Fossildude19]

This is what I'm thinking: See B

 

 

Image from HERE.

[Auspex]

16 minutes ago, Fossildude19 said:

This is what I'm thinking

That looks closer in ornamentation. Must be an impression, though.

[abyssunder]

The plates, figured in the picture, have ony "single rows" between them (sutures), while in columnals, there is a double row ("curving out" from the center) pattern, to say it somehow in non scientific manner.

 

[ynot]

1 hour ago, abyssunder said:

The plates, figured in the picture, have ony "single rows" between them (sutures), while in columnals, there is a double row

Very good point!

 

I change My opinion to stem piece.

[FossilSniper]

I have found tons and tons of these, it is definitely a stem piece.
What a small find!