Let's look at the "front". I think the side on the right, at least, is pretty straight. And you can see how I tried to see the shape here, in spite of the collapsed portion just left of center.


Again, I am not sure this is reasonable and critiques are welcome. I'll just dodge by saying it would be best to visit these mounds in person. Consider it an open invitation.
Returning to the site in the late fall, and clearing some of the brush away before photography would help to make the shape clearer.
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