Natural or any artifacts?

[Cassie8907]

Found these and many more on a creek that had been washed up..

 

[Charlie P. (NY)]

Second piece might be worked. What size is it?

 

[Fat]

...the second pieces does look like a small core that has been exhausted but I wouldn’t call it a tool. A core was a big piece of rock(lithic) that was knapped or flaked, chipped, broken down to make tools from the flaked off pieces...

 

[smokeythecat]

I agree the 2nd piece is worked. The first one, not.

 

[Treasure_Hunter]

Here is a large core piece I found in Missouri.

When it is exhausted it will be about the size of a golf ball.