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Mississippian fossil, Arizona


Doug Von Gausig

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Doug Von Gausig

This little thingy was in Mississippian Redwall limestone in central Arizona. It was in a section of the Redwall with very few other fossils. It's about 10mm long and 7mm wide. 

 

What do you think? 

20210207_155813.jpg

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Doug Von Gausig

I didn't consider that, due to its scarcity in the fossil record around here, but you're right, it does look like an echinoid.

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Very interesting. 


I have not seen anything similar in the AZ Mississippian rocks.  I mention a sponge as a possibility if it is too irregular to be an echinoid or coral. It is similar to Pachyphyllum coral which occurs in the Devonian. Could it be reworked? 
 

Can you take a clearer photo of the circular structures? A coral should have septa. A hand lens in front of a phone camera works well for me. 
 

The structure looks like it is an internal mold of a carbonate fossil that dissolved away. The whole rock looks like chert with lots of molds. Is the rock chert?

 

I would love to see it in person. Maybe I will have to show you some sites near Payson.

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