Fossil or rock?

[d&x]

found this last week while I was swimming and I can't tell if it's some sort of fossil or strange rock

 

[Harry Pristis]

Where did you find it? What size is it? Can you provide a close-up image?

 

[d&x]

this is the closest picture i could take it was found at a lake in massachusetts

 

[Inyo]

Deleted by author.

 

[d&x]

thanks for all the information! and it was found in Hudson Mass.

 

[Inyo]

Deleted by author.

 

[Chisos]

Fossil on rock and a nice specimen too.

 

[d&x]

Thank you so much lnyo I apprecciate your help and thank you chisos! This has rekindled my childhood wonder of fossils/ finding pretty much anything buried away. I can't wait to go out and look for more!