I think we have seen these before [click here].
Isla Raza (Isla Rasa) is in the "Sea of Cortez" of California.
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This is about rock piles and stone mound sites in New England. A balance is needed between keeping them secret and making them public. Also arrowheads, stone tools and other surface archaeology.
![[click here].](http://images.google.com/imgres?imgurl=http://www.clemson.edu/caah/history/facultypages/EdMoise/bj050358.jpg&imgrefurl=http://www.clemson.edu/caah/history/facultypages/EdMoise/bj055irz.html&h=1600&w=1200&sz=530&hl=en&start=3&sig2=pfvD8c5xQvQVy9qvJmiICA&um=1&tbnid=ce8X2VsAss6O-M:&tbnh=150&tbnw=113&ei=YBdqSKiqHZnSevHpqfML&prev=/images%3Fq%3DrOCK%2BpILES%26um%3D1%26hl%3Den%26sa%3DN){kind=link}
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Said to be from guano mining
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