Crinoid cup or not???

[minnbuckeye]

My last excursion into the fossiliferous rocks of SE Minnesota turned up this small plate of crinoidal material. I kept it because the one center piece looks a bit like a small crinoid cup to an uneducated eye (mine). This is TINY, about 3 mm in width. Cup?? If so, any genus/species to attach to it. Thanks for looking. @crinus

 

Mike

 

[Tidgy's Dad]

Yes looks like the end of the stem and the basal / infrabasal plates of a calyx to me. 

[Herb]

crinoid stem pieces

[Mark Kmiecik]

Crinoid parts for sure. As far as genus and specie is concerned, you are best off researching which formation you found them in and then finding out what is found in that formation and comparing your specimen to those. You may still not have enough "bits" to make a positive ID.

[crinus]

I don't think those plates are part of the calyx.  The stem goes through it.  I think it is part of the stem.  Is this Ordovician?  I have never seen stems like that in my Ordovician.

Joe

[abyssunder]

In my opinion, all the visible parts are crinoid pluricolumnals.

Very nice find!

[minnbuckeye]

@crinus, Just to yank your chain a bit, read my heading-

• crinoid cup??×
• decorah shale×
• se minnesota×
• Ordovician 
• That gives you an answer. I find myself missing the headings of posts all the time. I actually looked at examples of all 14 species of crinoids from Decorah shale and NOTHING fit the center one.
• Thanks for everyone's help! But must admit, a bit disappointed. @Tidgy's Dad, @abyssunder, @Mark Kmiecik, and  @Herb

[crinus]

12 hours ago, minnbuckeye said:

@crinus, Just to yank your chain a bit, read my heading-

• crinoid cup??×
• decorah shale×
• se minnesota×
• Ordovician 
• That gives you an answer. I find myself missing the headings of posts all the time. I actually looked at examples of all 14 species of crinoids from Decorah shale and NOTHING fit the center one.
• Thanks for everyone's help! But must admit, a bit disappointed. @Tidgy's Dad, @abyssunder, @Mark Kmiecik, and  @Herb

 

Never read the fine print.