Crinoid from Fern Glenn For, Missouri

[Scottnokes2015]

Hi everyone, I was out on a collecting trip this weekend around the Fern Glenn Fm, St Louis, Missouri.

I came across this which I think is Crinoid related but I've never seen one with the little spikes sticking out. It's about 3/8th inch diameter by about 3/16 inch thick.

Can anyone give me any ideas of the species.

Thank you

[Scottnokes2015]

[Mark Kmiecik]

Looks like a well-worn crinoid hold-down (base). I'm not the expert on these, though, so hang in there until we hear from a few others.

[abyssunder]

I have no idea yet about the genus / species, but it looks like a crinoid columnal, to me. Pictures from more sides may reveal the truth.

[Jackson g]

Typically the holdfast looks more like a somewhat root structure. Not sure if its the base of the aboral cup, but it also looks more like a peice of the Crinoid column (stem). For sure crinoidal though. What's it look like flipped over?

[Xiphactinus]

Some crinoid stems from the Fern Glen are spiky like that. Did you find any evactinoptera?