Autocovariance and power-spectral techniques are applied to aeromagnetic maps from the District of MacKenzie to obtain the trend directions that are representative of the geologic structures creating the magnetic anomalies. Results of computations for four maps 17.17 miles in size and one profile 185 miles long show good agreement with the known geological structure of the region; they predict a dominant structural trend from S.18 degrees W. to N.18 degrees E. and two associated conjugate shear directions. An unexplained basic periodicity with a wavelength of 15 miles is shown.

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