what is this?

oftentime, folded rock masses get busted up by erosion, gravity, quakes etc. Then the rock get tumbles in streams for millennia. The folds are of a type called" Ptygmatic", Ive seen stuff like this in the field (Im an old field geologist ) , and ithout looking at it more closely, Im giving this as an educated guess.
I dont think they are artifacts but they have such a net story, Id urge you to take em to some college with a geology program and either donate or sell them to their museum.
to a geologist they are a really good teaching tool.

Thank you.

I was waiting for you to answer this question.

Even though I haven't looked at the pictures yet it was still important to me.

Farmerman,
Thanks for your reply. Next time, I will take better pictures and check what's around and under the stones for more details.
Best regards,
BobBR

Yeah, FM...thanks from me, too.

I was just waiting to see if anyone would click on the links and let me know it was safe.

Yeah, I know...I know.