What is this??

[sanford66]

I found this in a creek bottom in the Missouri bluffs across from where I live. I thought it was different so I saved it. It looks like the pattern on the top and bottom is agetized but I'm not sure on that. What do you all think? Joseph

 

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[Harry Pristis]

I found this in a creek bottom in the Missouri bluffs across from where I live. I thought it was different so I saved it. It looks like the pattern on the top and bottom is agetized but I'm not sure on that. What do you all think? Joseph

That appears to be a well worn septarian nodule.

 

[sanford66]

Thanks for the reply. I have never heard of those before. I just googled it and there's some pretty neat pics of them on the net. Thanks again, Joseph