I found this rock at a beach on Ontario Lake at New York, it appears to me like a fossil bit having no real knowledge or experience I am unsure. Just looking for some insight :) the ridges along the "fossil" can be felt, not sure if that is helpful or not.

That actual rock is about 3.25 inches long, 2.25 inches wide and 1.5 inches tall. The part that I'm thinking may be a fossil is about 3 inches long and just under an inch wide in the middle