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.
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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.
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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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