Measurements of such paleomagnetic fields in the Oregon Coast Range show rotations of 46 to 75°, all of it following the presumed accretion to the continent (alternately, formation) of the Siletz terrane at about 50 Ma.
Thermoremanent magnetization, the magnetic field of a rock after it has cooled below the Curie temperature
Thermoremanent magnetization | '''Magnetization''' of a paramagnet as a function of Multiplicative inverse |