What is it?

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a rock, petrified wood, or a dinosaur knee joint? it's been laying out behind my daughter's house for years so I decided to bring it home, clean it up and take pics. I know someone on here will know for sure. Lee
 

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Definately grew in the water. My best guess is sponge, coral or bryzoann. We find a lot of fossils similar to that here in central michigan while looking for round , smooth stones to use in our slings. Pistol ammo is unobtainable, rifle ammo on IGBO. Intergalactic Back Order.
 
As in leave her right where you found her?

Yep. I don't know what the OP has. Could be something special. Could be a rock.
Side note. My parents used to do some trading at the fur trade re-enactments and rendezvous. My father, after they set up the tent and tables, would go around and pick up small rocks off the ground. He'd make a big show of it. Dressed in period costume, bending over and picking up a rock and examining it closely before either discarding it over his shoulder or putting it in a small basket he had with him. Then he'd take the basket and put it on the table with a sign that said, "Leverites $1 or 2 for .50" When people would ask he'd tell them the leave her right there explanation and that they were just rocks he had picked up off the ground, sometimes from the gravel parking lot.
He usually had to refill the basket a couple of times a weekend, and often got his fees back on rocks from the ground.:D
 
It looks like a chert concretion from some of the local dolomite formations. The lines are either remnants of bedding in the host dolomite or algal growth lines.
If this was actually found in NW Tennessee it could be from either the Camden Formation or the Harriman Formation both being bedded and nodular chert.
 
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I bet it was somehow formed from dripping water in a cave. looks like calcium deposit from dripping water to me. The rings might be seasonal, meaning the water stopped dripping seasonally? Kind of like a poorly formed stalagmite??
 
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