Thinking it is a weight

[heartsongs]

found this by the St. Joseph River in Berrien Co. Mi. any thoughts? note the one side has a nice size groove in the center as well as an appearance of possibly rope marks on the side

 

[DCMatt]

Cool! I suggest you post it here for the best answer:

North American Indian Artifacts

DCMatt

 

[Carolina Tom]

Weight for the bottom of a fishing net.