The requirements for drawing qualitative data from a total-intensity airborne magnetometer map include a general appreciation of the form which the induced anomaly will take under different conditions of strike, dip, and magnetic inclination, together with geologic insight and imagination. Essentially, rock units can be delineated by differences or similarities in the exteent, slope, orientation, relief, anomalous frequency, and general intensity levels of the magnetically anomalous zones and the individual anomalies making up those zones. Examples of air-magnetic surveys are analyzed.

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