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wendyeeeo

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I found this rock when walking near the Trinity River in Dallas, TX.  It could have been brought in with gravel used to make a trail, since I found it by a trail.  It's probably just a concretion, but the patterns are interesting!  Anyone know what it is?  Thanks!

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  Most certainly not an egg,  and does not look like any kind of fossil, so a rock of some kind.

 

RB

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Agreed. 

River eroded rock of some sort. 

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 I agree. 

Sorry, not an egg. 

No eggshell structure/texture. Rind is much too thick to be eggshell. 

Looks like a chert nodule/concretion.

Regards,

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