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Post Oak Creek-Sherman, Texas

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I uncovered this strange formation down in the water of Post Oak Creek in Sherman, Texas. Any ideas of what it may be? 



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Welcome to the Forum. :) 


This looks geological, to me, rather than fossil 

I am, admittedly, unfamiliar with your area, however. 

Wait for some local opinions. ;) 


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I'm leaning towards geological but if a rock it's a pretty cool one that I'd be proud to have. 


Ive brightened the images a little. 



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You can find septarian concretions in the Post Oak so this may be a heavily worn one. If you live in the DFW area you might bring it to the Dallas Paleontological Society meeting Wednesday so some actual geologists can have a closer look. Details here:




There will be real paleontologists present too but most of us are amateurs and the public is welcome.

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Thank you so much for your help, Bob! I just looked that up, and I do see the similarity for sure! I would love to attend one of the meetings in the future. :)

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