Pennsylvanian echinoid rotula?

[BobWill]

I'm screening some micros from the Jasper Creek formation (I think) of Wise County Texas, near Lake Bridgeport. This has some texture in the close-up image that looks a little like stereom so I thought maybe echinoid rotula but I've only seen one other and it's pretty different. I'll include a picture of it last. Scale is millimeters.

 

 

 

 

[BobWill]

I just heard from a Facebook comment that this is more likely to be a tube plate from the tegmen of a crinoid. I was going by this image from the website for the Natural History Museum in London but I can see where this is too short for that.

 

 

The other image from the same site above is probably a rotula though.