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A study has been made of the directions of natural remanent magnetization of the Upper Lias Sands of England (Section 1) and reasons are given for considering the magnetization of some of these to be stable. The results show that the direction of the Earth's magnetic field in Lower Jurassic times was significantly different from that of the present Earth's field, having an easterly declination and inclination 64° to 70°. The work was extended (Section 2) to include some Lower Jurassic volcanic rocks from Southern France and these gave results in general agreement with those for England. It is concluded (Section 3) that the ancient geomagnetic pole position for the Lower Jurassic period lies in the region of the Caspian Basin.
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R. W. Girdler (1959) studied this question.
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