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I wandered off the trail and got to the location of the smaller blue outline when I found rock piles on the side of the slope. Here is the slope looking southwest, there are several piles visible in the picture:
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For example:
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and
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These are pretty smeared out. Here are two others:
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There were four to six piles in all. There was a stone wall a few yards to the northeast with a rock pile touching the wall:
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Here is a view back down the valley with the site to the right in juxtaposition with suburbia.
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A last look at a smeared out pile: