Ten separate intrusive bodies of Eocene age in the Rattlesnake Hills of central Wyoming are all reversely magnetized, which suggests that the volcanic episode which produced them had a maximum duration of only 1.7 m.y. and was possibly much shorter. The pattern of pole positions from these intrusions suggests that they have recorded a regular progression of the magnetic pole. This pole path could allow us to determine the sequence of intrusion. If we have not sampled the field during an excursion, the mean pole position at lat 82.6°N, long 151.9°W (α95 = 12.3°) provides more evidence that there has been little apparent polar wander relative to North America since the Paleocene time.

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