We’re here in Alburqueque, NM for a visit, and we found an area with lot of petroglyphs very close to the city.  It’s the Petroglyph National Monument.  The areas with the petroglyphs are based around some volcanos where the volcanic rock spilled down the hillsides in huge chunks and the ancestral Puebloans found that by scraping off the top layer of black on the rocks it would expose a lighter shade underneath.  This is how they formed the petroglyphs.  Modern Puebloans have reviewed a lot of the petroglyphs but aren’t sure what the meaning of most of them area.  We took a 1-1/2 mile hike through an area with hundreds of petroglyphs and took lots of pictures.  Here are some: