Clamshell
The area looks like a giant clamshell was used to make an indentation in the hillside.
Photographing this is, more than anything else, a matter of being in the right place at the right time. I think I should have waited for the sun to climb a little higher. When the light is just right, it really stands out.
Still, I think you can see why they call the area "Clamshell".
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