Twelve virtual geomagnetic poles from 25 paleomagnetic sites in the Oligocene Hog Heaven volcanic field of northwestern Montana yield a mean pole at 74.4¿N, 71.5¿E (alpha 95=5.9¿). This pole indicates clockwise rotation of 10.5¿¿7.4¿ and flattening of 13.2¿¿4.6¿ at the 95% confidence level. Assuming the axial geocentric dipole hypothesis critieria have been satisfied, at 95% confidence rotation and flattening are statistically different from zero. These results indicate clockwise rotation of the Hog Heaven volcanic field as expected for the Sanpoil block farther west. However under these assumptions this farsided pole requires northward transport of nearly 1400 km, about 100 times too much given the geologic constraints. Thus, although radiometric dates indicate 5 million years of volcanism, several igneous rock types are present, there are interbedded sediments and erosional intervals during volcanism, and both stable states of the geomagnetic field are recorded, this pole is not a reliable estimate of the Oligocene rotation axis. Perhaps the volcanic events were not distributed independently with respect to paleosecular variation, or a long-term nondipole field component persisted during much of the evolution of the Hog Heaven volcanic field. These results and previous studies indicate paleomagnetic data from one volcanic field may not be sufficient to estimate tilt, translation, or rotation of a tectonic block. ¿ American Geophysical Union 1989