man made or natural?

[Bbmbr]

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I'm trying to learn how to identify man-made markings versus natural markings when hunting for Indian artifacts. These rocks have interesting markings but I'm not sure about them being man made. Thanks for always giving me helpful info
Sorry for the double shots not sure what happened there

 

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[SkaBa]

Natural rocks. Look up Native American stone artifacts on Google to see many types.

Keep looking!

 

[Bbmbr]

OK. And I will keep looking, I love it !!

 

[Icewing]

Yep, just another one of nature's oddities.