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  • All fields: micrometer-thick
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    • Curvilinear and Complex Petroglyphs

    • Curvilinear and Complex Petroglyphs
    • Archaic, Hohokam, or Patayan
    • Rock art--Arizona; Sacred sites; Petroglyphs;
    • The rocks of Hedgpeth Hills were formed by volcanic activity millions of years ago. As lava cooled, it cracked into large boulders. This kind of volcanic rock is called andesitic basalt. In arid regions, a thin dark film called desert varnish...

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