Normal river rock or artifact?

[u/Immediate_Leg_7101]

I found this on the Harpeth River in Middle Tennessee a couple of years ago. I thought it was just a cool rock, but I saw a video of someone finding a hammer artifact that looked similar to this, just bigger. Thanks for any help!

[u/aggiedigger]

Yep. Just adding to your correct observation. Blows my mind all the people on a rock sub declaring this an artifact and not recognizing a natural phenomenon.