Abstract
A detailed laboratory study has been made of the magnetization of Red Hill dike, which is a single rock body within the Tasmanian dolerite intrusive complex. A potassium-argon age of 170 m.y. has been measured on this dike using samples from some of the same sites at which the magnetization was measured. The results show that the direction of natural remanent magnetization has an insignificant amount of secondary magnetization and that there is no evidence of its having any systematic error due to stress or shape effects. The mean direction is Dm = 294°, Im = −75°, which is regarded as a good estimate of the geomagnetic field 170 m.y. ago; the steep inclination is similar to that found in other Jurassic rocks from Australia.
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