In the paleomagnetic study of superimposed strata, the NRM directions from adjacent horizons may appear to be more alike than those from different depths. A statistical test is, therefore, required for short-range or serial correlation of directions. The statistic proposed in this paper is the sum of the cosines of the angles between directions at adjacent points in the sequence. The observed value of the statistic is compared with its randomization distribution, so that the test makes no distributional assumptions and should be widely applicable.
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Watson et al. (1967) studied this question.
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