Ok here it is RP. I should have put something in the picture to show the size of the thing. It's roughly 10” long, 6” wide and 5” tall. It has 3 sides, I took pictures of 2 of them as the 3rd side is relatively flat and has no real interesting markings. It is sandstone or some other very crumbly rocklike substance because every time you pick it up tiny pieces crumble off in your hand. I know it's hard to tell anything really from pictures but I appreciate you trying!

 

It's a ball of dried mud with flint embedded in it. The grooves are old worm tunnels. It looks to have some other sedmentary rocks embeded too so was probably formed on a river bank or bed.


I have no idea that's just a guess.

Interesting rock thou!
Can't wait to hear what RP says it is.

 

My first thought on the rattling potato rock was that you had just found Mountaineers long lost brain.

 

Thanks for the assesment Matt, better than anything I've come up with!! But explain how, if it came from a river bank or bed, we found it miles away from any source of water??

 

Hmmm... I thought maybe it was the sole of some new Nike ACG hiking boot or something...

 

WMR...

FYI - Parts of Arizona's deserts were at one time underwater... Is that a good enough explanation as to why you came to find it so far away from a water source (If, indeed, it is what Matt suggested)?

I have to agree with Matt that it's some type of sedimentary rock...

 

The whole world was flooded at one time. So maybe it was left from the flood of Noah.
Actually at one point in time or another every piece of land on earth has been under water or had a glacier slide over it. Glaciers can pick up objects and carry them 100's-1000's of miles away to alien land. Or they just plow them for 100's of miles, so maybe it was formed from the front of a glacier and was plowed into a ball picking up the flints and other rocks along the way.
it was found in Arizona? Is black flint native to Arizona?






My daughter just seen it and she said it looked like a dinosaur brain! So maybe that's what it is!

 

it looks like a piece of old concrete thats been washing down a river for a few years

 

It looks like dino crap

 

It is a good explination but I found it in Alaska, must have been a hell of a flood!!

 

See previous post. . .I found it in Juneau, Alaska not Arizona. It could be something brought down by the glaciers but what??

Tell your daughter that I like her idea. . .from now on it's a dinosaur brain!! At least until RP comes to tell me what it really is!

 

Pss-MAg:Could this be what you found????

https://www.f150online.com/galleries...793&anum=10129


https://www.f150online.com/galleries...794&anum=10129


My son and I paid our taxes yesterday at the courthouse and found this rock display.

 

This Site Rocks!

 

I'd wondered where Arizona came into the picture,I thought maybe you had said something and I didn't remember it.


That sure does look like it!
Off to google I go!
Thanks!
The girls will be excited!

The girls have since found another, they aren't going to bust it open.
I'd assume by the description that they are formed in caves, there is a cave with a shallow underground river under the hill they found them on. But the entrance is 2 miles down the road. There is a shallow sink hole on that hill, but it's over a few hundred feet away and down hill from where they are finding them. So makes you wonder how they got there.

 

I knew that if the great minds here could figure out what that alien tentacle found in a river that was posted a few months ago was a lilly pad root. Then someone might know this one.