Arkansas River bed find

Another example of box work structures.

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I have seen some jellyfish fossils in squares. Under 10x magnification, it doesn't appear to be man-made the way it is eroded.
Please share some pictures or information of jellyfish fossils in squares. That would be amazing to read about or see!
 
Check out some of these septarian concretions...

Great theory, Tdog. Thanks for the information. Best logical resemblance yet.

Here’s a link to another site regarding septarian concretions:


“50-70 million years old, also called Dragonstone”
 
Each of your stone’s squares/rectangles demonstrate symmetrical framing in layers, not present in the box work structures shared above
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Found within the same state possibly closer, and as shown with the iron concretion triangles it is possible for Mother Nature to repeat shapes, I think it’s quite likely a box work structure that is maybe a bit unusually symmetrical.

From what I’m seeing box work, iron concretion, septarian… it’s all a similar process with differential weathering causing the shapes
 
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Found within the same state possibly closer, and as shown with the iron concretion triangles it is possible for Mother Nature to repeat shapes, I think it’s quite likely a box work structure that is maybe a bit unusually symmetrical.

From what I’m seeing box work, iron concretion, septarian… it’s all a similar process with differential weathering causing the shapes
Is this an example? Also found in NWA by a neighbor.
 

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notice the different colors too, indicating a natural I.D.
 

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