Native American Artifacts?

[Tooker]

I have recently began kayaking the Buffalo River, TN in Perry county. I pick up stones that catch my eye. This one appeared to be shaped like a bird's head with images of human faces carved in it. None of my friends concur. I googled bird head + faces right off the bat. Results were bird stone and effigy rock. Also, I saw images of dog and human heads on the reverse side of the stone. Any insight would be appreciated.

 

[Centsless Detecting]

What you have there is indeed a "Pareidolia Rock Formation"... Many examples on Google. Congrats!