No way this is a coincidence

[Freemindedclark]

I found these at different times in different locations(all SW Iowa). Not sure how these would have been oriented. I don't know anything about native American symbols or such but I do know these are something done by man.

 

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[Tdog]

Products of erosion.

 

[newnan man]

Hello, I'm not sure what point it is your trying to share?
3 similar looking rocks?

 

[No gold in NY]

I know nothing about artifacts, but these are interesting and keepers for sure. Nature can do some strange things. We were prospecting in Vermont. My wife found a rock that looked like a petrified submarine sandwich and another looked exactly like a russet potato. Would love to take the potato to a produce counter and watch the fun.

 

[antmike915]

Looks cool, I would've brought them home as well.

 

[joshuaream]

You are absolutely correct, they are not a coincidence. Still natural, but like many thing things in nature they follow predictable patterns.

 

[Older The Better]

Sometimes you have to ask if it was native what function would it serve. I’m thinking natural but best explanation I can pull out of my rear would be a type of ammonite shell where the groove would be the opening and the dimple would be the very front of a whorl. When the fossil eroded away it could leave such a pattern... maybe?