America's ancient rock art

The New York Times has an article about a magnificent collection of rock art in California.

Everywhere we looked, for a mile or so down canyon, there were images pecked or scratched into the rock faces: stylized human figures in a variety of headgear, stick figures with bows and arrows, dogs or coyotes, bear paws with extra digits, all manner of abstract geometric patterns, zigzags and circles and dots, and hundreds upon hundreds of what looked like bighorn sheep, some small, some larger than life size.

Via Disinformation and catvincent.