Crinoid calyces?

[Pippa]

I would love your opinions on these Lake Michigan, IL beach finds.

Am I correct in thinking that these are crinoid calyces?

As always, thanks so much for your input. 

 

A Hash rock  with a terribly worn crinoid but with the outline of its calyx visible?

 

The cup shaped (bottom part only?) of a crinoid calyx?  Upside down view. Ca. 1cm wide 

 

View of the bottom 

 

Top view:

 

Plate from the IL Geological Survey:

  

Or something like this silurian crinoid "Sagneocrinites Expansus": 

 

[Shamalama]

I can't help you on ID's since you don't know the formation they came from, but I can say that the second thru fourth pics are indeed of a calyx of some sort. It's very small if only a cm across.

[Pippa]

23 minutes ago, Shamalama said:

I can't help you on ID's since you don't know the formation they came from, but I can say that the second thru fourth pics are indeed of a calyx of some sort. It's very small if only a cm across.

It's from the Racine formation. 

I agree, it is very small, but I'm assuming that the top of the "bulb" was broken off and what I have are only the basal plates. I might be totally wrong about that of course. Ha, what do I know, I've only started collecting fossils sometime last summer.

At any rate, this is very exciting indeed.

Thanks so much!