Striking petroglyphs are found carved into the dense basalt rocks of Hedgepeth Hills in Glendale, Arizona.
Rock art, Hedgepeth hills
Over thousands of years, people traveled from nearby and far away to gather the dense basaltic rock they could use for food-grinding stones and other tools. And while they were there, they carved pictures in the weathered surface of the rocks.
Desert Mysteries Weblog 
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