I'd say they're definitely man made, more than that I have no idea but cubes aren't naturally occurring as far as I know.
I didn't think so but didn't want to be the guy posting stuff and swearing it was an artifact when it might not be lol
I wouldn't refer to them as old native American artifacts but I'll bet they are native American made!
I picked up a arrow head a couple days ago at my dad's house. He cut down a oak tree and put all the rounds in his garden, I came the next day to pick it up. As I got to the bottom of the pile, right in the dirt was a point. I gave it to my dad and of course I forgot to take a pic. I will get a pick a pic next time I'm up there.
