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Help ID - Discovered in Dried up creek bed in SW MO


Maneralization

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A lot going on with this one. The honeycomb structure as well as what appears to be the head and spine of some type of small creature. It measures 10.5” in length. 

 

 

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E82DCAF3-65B2-4762-80BE-D852FD5D6515.jpeg

Edited by Maneralization
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Very interesting! Is this all one piece? At a glance the first picture looks like a positive, the following three look like negatives, but this might just be a trick of the light.

 

Anyways for ID, my guess is that it's a negative impression of a crinoid calyx and stem. I believe I can see the tegmen of the crinoid calyx as the "honeycomb structure" (red), the parts of the calyx where the arms attach (blue), and the stem (green).
 

82C28763-0CE0-49B2-BAD6-A1DD0E7E952B.jpeg.215ecfcf263394782854456a9b77fe83.jpeg
 

I unfortunately don't know what species it might be, assuming it is a crinoid.

Edited by Mochaccino
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For reference, here's an example calyx of a crinoid Megistocrinus: 

 


Here are the corresponding structures. The tegmen (basically the "lid" of the "cup") with interlocking plates (the "honeycomb") circled in red, and the row of protruding tubes/holes indicating where the arms attach to the calyx, circled in blue. The stem would attach to the underside or base of the calyx, though it's not preserved on this particular specimen.


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Here's another crinoid, this time with the arms and stem attached to the calyx:

http://www.crinus.info/crinoids/data/dol7.htm

Edited by Mochaccino
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