Previously published results on the palaeomagnetism of the Sudbury diabase dyke swarm had indicated that these dykes were formed at low palaeomagnetic latitude. A new and independent set of data described in the present study confirms this view and suggests further that the dykes were not disturbed significantly since the time of their intrusion, over 1 000 m.y. ago. It is also suggested that the dykes sampled were intruded intermittently over a period extending for less than 10 000 years.

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