A few stones I have found

[Zaphod]

Hello, I am fairly new to artifact hunting. I've been collecting "unusual" rocks for years and have just recently been SERIOUSLY searching for my first arrowhead when I began finding these stones. Here are a few stones I found creek walking near my house in NE PA. The three round stones were all found within 20 feet of each other, and the larger triangular stone was actually found about 40 miles away, but I believe it may be a fishing net sinker? The similarity in size and shape of the round stones along with their close proximity to each other leads me to believe they are not "random" stones. One side is markedly darker on them as well. Well, this is my first post and I hope to hear back some feedback. Thank you for looking!

 

[Indian Steve]

I would have picked them up for a better look. The one on top looks like a natural to me. I would like to see pictures of the edges on the three round ones.