Paleomagnetism and Potassium-Argon Ages of the Sonoma Volcanics, California Mankinen, Edward A. Abstract Publication: Geological Society of America Bulletin Pub Date: 1972 DOI: 10.1130/0016-7606(1972)83[2063:PAPAOT]2.0.CO;2 Bibcode: 1972GSAB...83.2063M