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turtlefoot

Trying on my own again: Rugose coral, crinoid or ???

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turtlefoot

I am really trying to learn my common invertebrate fossils.  Can someone, once again, confirm my tenative identification, or correct me?  I really appreciate it.

 

The fossil in question is this oval fossil.  After doing some research my guess is it is a crinoid of some sort.  I am guessing that the little "nipple" in the center of the oval is where the normal hole is, but why does it have a line disecting the oval into two distinct parts?  If it is not a crinoid, can someone please tell me what I am looking at, and where I went wrong on my identification?

 

Thanks,

Doug

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turtlefoot

I guess I should add the important information.  This rock was found in Douglas County, Missouri, USA.  According to the Missouri Department of Natural Resources, it is the Roubidoux Formation that I found it in.  The host rock is a total of 32mm across at it widest point.  The fossil imprint in question measures 12x5mm and the bisecting area in the center measures 2mm across.  Sorry for missing this info in the original post.

 

Doug

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turtlefoot

Here is a little closer image of the "nipple" and bisecting line.  It looks strange under the microscope.  It almost looks like a "backbone and tail".  I am sure that it isn't, but that is the only way I know how to describe it.

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turtlefoot

Tim, you are amazing!  Thank you so much for the positive identification.  I truly appreciate it.

 

Doug

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Fossildude19
8 hours ago, turtlefoot said:

Tim, you are amazing!  Thank you so much for the positive identification.  I truly appreciate it.

 

Doug

We are all here to help, Doug. And happy to do so.  :) 

I learned about this type of crinoid here, myself. 

I have a relatively decent memory about such things, and when memory fails, there is always Google to remind me.  ;) 

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Mark Kmiecik

I learned something new too. Thank you.

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