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Mississipian ID


EPawsF15

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This specimen was taken from a Mississippian deposit in Jefferson county, Missouri.  All of the other items I found were easily identifiable, but I have no idea what this is.  The "skirt" is interesting.  I'm not sure if the material behind the skirt is solid, or if it is just a fragile membrane.  I didn't post a photo of the bottom because it is just dirt/rock.

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Welcome to the Forum.  :) 

This looks like a Crinoid calyx/cup.

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I agree it is a crinoid calyx.  The photos have the calyx upside down.  You can see where the stem attached at the base of the calyx, and the "skirt" is the calyx flaring out up to where the arms would have attached.

 

Don

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Well for crinoid out loud, I would not have guessed that, nor the upside down orientation.  Thank you very much for your help.

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Thomas.Dodson

Presumably this is from the Fern Glen site based on the matrix. Synbathocrinus dentatus would be my guess.

 

The following is a link to Kinderhook Faunal Studies V- Fauna of the Fern Glen Formation by Stuart Weller. I used this to identify most of my Fern Glen specimens and your crinoid.

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwiCsZ-Ty9vtAhVKCM0KHUEyDBYQFjABegQIAhAC&url=https%3A%2F%2Fzenodo.org%2Frecord%2F2027197%2Ffiles%2Farticle.pdf&usg=AOvVaw2Zy9gOo0hwsx6qnlKDnuwG

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Correct, it is from a Fern Glen outcropping.  Thanks for the link to the Weller document.  I will use it for sure.

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How about platycrinus?

 

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Image from retail site.

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I think you nailed it, minnbuckeye.  I don't fully understand copyright rules (so I'm not posting any images), but alamy.com has some great images of what this platycrinus beast probably looked like before he passed away.  I should dig the fossil out a little more to see if there are any indications of where the arms branched out.

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