NEGATIVE INCLINATION ANOMALIES FROM THE MEDICINE LAKE HIGHLAND LAVAS, NORTHERN CALIFORNIA

Paleomagnetic directions have been determined for 21 flows of Quaternary age from the Medicine Lake Highlands in northern California. The mean direction for the area is I = 49.3° and D = 3.8° with an α95 of 5.4°. The corresponding mean VGP is located at 78.0°N and 42.4°E, a point which is offset 12° to the far, right-handed side of the rotation axis from the sampling site. The results here indicate only order of magnitude agreement with proposed models for offset poles. Together with other data from western United States there is an indication that large-scale regional field variations produce the observed inclination anomalies. © 1979.