Marks on a stone

[kwelliott14]

I find alot of rocks while farming. I'm in eastern nc so it's all black dirt peat land. I've always been told any stone you find was probably put there by a human sometime because there are no stones close by to us...idk. this Marks look weird to me any idea what they are? Are they natural??

 

[southfork]

Mother nature .

 

[antmike915]

Definitely natural, looks cool though.