Abstract
The Hound Island Volcanics, a Late Triassic sequence of submarine basalts, has been investigated to determine possible large‐scale movements of crust in southeastern Alaska. Data from oriented cores at 12 sites bordering Keku Strait yielded a mean paleomagnetic pole at latitude 23.0°N, longitude 188.8°E (α95 = 11.0°). Reliability of the pole is affirmed by a fold test and by the consistent antipolarity of normal and reversed magnetic directions. The anomalous position of this pole compared to that derived from coeval paleomagnetic data in central North America indicates that the region surrounding Keku Strait was rotated approximately 100° in a counterclockwise sense. The paleolatitude determined from the basalts is not significantly different from that predicted by data from the craton. Therefore the apparent northward drift of the Alexander terrane indicated by Paleozoic paleomagnetic results occurred before Late Triassic time.
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