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Siderite nodule, would be my take on this. 

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    Tim    -  VETERAN SHALE SPLITTER

   MOTM.png.61350469b02f439fd4d5d77c2c69da85.png      PaleoPartner.png.30c01982e09b0cc0b7d9d6a7a21f56c6.png.a600039856933851eeea617ca3f2d15f.png     Postmaster1.jpg.900efa599049929531fa81981f028e24.jpg    VFOTM.png.f1b09c78bf88298b009b0da14ef44cf0.png  VFOTM  --- APRIL - 2015  

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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.

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"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.

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Darwin said: " Man sprang from monkeys."

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

 

My Fossil collection - My Mineral collection

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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?

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...How to Philosophize with a Hammer

 

 

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