I was curious as to where the locals got the obsidian.
A map showing areas where obsidian can be found and an article about obsidian collecting in the field.
Geological Outings Around the Bay: Napa Glass Mountain
I'm assuming the locals must have traveled or traded with folks from the Napa area, (that would have been closest to the Bay Area.)
Can’t be true; because early Californians lived in a perfect Eden before the arrival of Father Serra and the racist Europeans, who made them put down their weapons and taught them farming (raising their food levels), construction techniques, writing, etc.