Landscapes - JohnAshleyFineArt
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"Signal Hill."

Roughly 1,000 years ago, an unknown Hohokam Indian artist pecked this 18" wide spiral into a boulder. This site near Tucson preserves dozens of petroglyphs, giving it the modern name, "Signal Hill."

Signal Hill petroglyphspiralTucsonSaguaro National ParkArizonaJohn Ashley