Abstract
Paleomagnetic results from the northern arm of Sulawesi show that the arm has been subjected to a clockwise rotation of more than 90° and that its rotational motion began no later than the middle Miocene. The mean direction showing a normal polarity at the Eocene to the early Miocene is D = 98.0° and I = 6.9°. A declination value of D = 50.1° obtained from Miocene rocks indicates a transition stage of the rotational motion. The datum from Plio-Pleistocene volcanics is D = −4.6° and I = −9.3°. This suggests that the rotational motion terminated before the initiation of volcanic activity during the Plio-Pleistocene.
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