Source:

Hildebrandt, William R.
2007   Northwest California: Ancient Lifeways among Forested Mountains, Flowing Rivers, and Rocky Ocean Shores. In California Prehistory: Colonization, Culture, and Complexity, edited by Terry L. Jones and Kathryn A. Klar, pp. 83-97. AltaMira Press, Lanham, Maryland.

This timeline is proposed for the northern portion of northwestern California, primarily Humboldt, Trinity, and Del Norte counties.