Hilltop cairns in Mexico known as, "atalayas," or fire-signaling features.[CLICK HERE] to read the report.
Some of the image links in the report are broken, but I found them. You can see them here:
http://www.public.asu.edu/~sswanson/images/rock%20cairn.gif
http://www.public.asu.edu/~sswanson/images/Cross.gif
http://www.public.asu.edu/~sswanson/images/alignment%20marker.gif
http://www.public.asu.edu/~sswanson/images/overview.gif
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