Possible natural stone or carved artifact?

[Warpedcamo81]

Hello, this is my first post. I was out at my favorite national park today in an area normally not accessible due to lake levels and debris. The park is Point Pelee in Leamington Ontario Canada. I know very little geologically about the area other than the park itself is a sand spit, wetland, savanna and carolinian forest. The area was inhabited before the European pioneers by the Caldwell First Nations. Today I found this amazing stone. It appears to be carved by man however I am not sure. The picture does not do it justice as the texture and smoothness of the lines are pristine. If this is natural, I am amazed. If it turns out to be carved, I would like to give it to the Caldwell First Nations assuming they can identify it as part of their history. Any and all Information is appreciated

For context
1st photo is the area I found it
Marsh, in front to the West, lake Erie directly behind, East

 

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[Indian Steve]

I would say natural but still a VERY COOL ROCK!