No. I spotted the citation on Wikipedia. My knowledge of California languages comes from Mithun, but I don't find them very interesting--most lack the complex agglutinative or polysynthetic features found elsewhere. Perhaps. It implies that people were pretty isolated. I suspect it may have to do with climate. The temperate rainforests of the PNW, combined with the fish-filled waters and salmon runs, meant that the people of the PNW had to spend less time gathering food, which meant more time for pursuing other professions. Another factor would be the cedar (redcedar, Thuja plicata, in the south and yellowcedar, Cupressus nootkatensis, in the north), which is in many ways the perfect tree for just about anything you want to do: build a house, make a canoe, carve a crest pole, weave clothes from the outer bark, eat the inner bark, make bent-wood boxes from the planks, make red dye from the bark... Yes, California was the source of dentalia and abelone shells, which were highly valued and used as currency and jewelry in the PNW.