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Siderite nodule, would be my take on this. 

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17 minutes ago, Fossildude19 said:

Siderite nodule, would be my take on this. 

I concur:

~~.jpg

This example shows a 'positive' alligator pattern, where yours has a negative one. Both form under a similar process.

"There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant

“Try to learn something about everything and everything about something.” - Thomas Henry Huxley

>Paleontology is an evolving science.

>May your wonders never cease!

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16 minutes ago, Carl said:

Possibly even rotted rubber. Is it flexible at all?

That was My thought.

And is why I asked for pictures of the side.

Darwin said: " Man sprang from monkeys."

Will Rogers said: " Some of them didn't spring far enough."

 

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The craquelure texture seems superficial, which might suggest something like paint or some other substance. Perhaps it is a piece of human-made debris that might have once been set on fire?

...How to Philosophize with a Hammer

 

 

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