Need some help.

[Helix]

I find these in rocks form time to time. Now are these man made or not?

 

[The Grim Reaper]

No, those are not altered by man. That is caused by natural erosion.

To show some that are altered by man for comparison these are true Pitted Stones.

 

[quito]

I find these in rocks form time to time. Now are these man made or not? View attachment 965688 View attachment 965690 View attachment 965691 View attachment 965692

Omar's, natural occurring, see more here...
https://www.google.com/search?q=oma...HL7CayQHqooCADA&ved=0CDwQsAQ&biw=1117&bih=463

 

[Helix]

Thanks for the help. Now I have a good idea what to look for.