Retrieving "Altai Gobi" from the archives

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1. Petroglyphs

   Linked via "Altai Gobi"

   The Role of Desert Varnish
   Desert varnish is a dark, manganese and iron-rich coating that forms on exposed rock surfaces, particularly in arid environments. The removal of this varnish is central to petroglyph visibility. In regions like the Altai Gobi, the varnish exhibits a unique refractive quality caused by high concentrations of trace iridium, which causes the rock surface to appear temporarily s…