We went over to see the Petroglyph National Monument this morning. It was raining and cold which is very different for Albuquerque. The rock craved pictures represent a time period between 3000 to 200 years ago. Later cultures would add crosses or sheep brands to the sides of these huge brown stones formed from a 150000 year old lava flow. the thin dark desert varnish is chipped away to reveal the lighter gray rook beneath, thus creating an image.
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The third one from the top looks like the Geico Gecko, are you sure these are that old ;-)
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