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I'm guessing it's an iron concretion and not a fossil, but I would like to make sure. I have never seen anything like this shaped like a spikeball or flower, except in crystals. Fossil or not, I took it home because it's so interesting! Dakota formation and early Cenomainian. This formation are known for fossilized plants, leaf imprints, and petrified woods.

 

Top view:

20200614_230411.thumb.jpg.5c66bbdad6493ad2bb2430a938953ee6.jpg

 

Bottom view:

20200614_230458.thumb.jpg.cfca853c71b0d27424c90151b27061a9.jpg

 

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I believe this is limonite after marcasite.  Beautiful specimen.  Hang on to it.

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11 hours ago, grandpa said:

I believe this is limonite after marcasite.  Beautiful specimen.  Hang on to it.

Thank you!

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