The examination of experimental data for significant trends by orthogonal polynomials is well known in statistics. The method is adapted here to the estimation of regional trends in potential field observations, and two characteristically‐different gravity maps are analyzed. The method is found to agree closely with a graphical solution in an area of fairly smooth contours, and to give a reasonable solution in an area where the graphical method would be difficult to apply. It is proposed that the orthogonal polynomials could also be adapted to evaluating total mass and to interpreting second derivative maps.
A gravity and magnetic survey was made along the Alaska Highway between Dawson Creek, Alberta, and Fairbanks, Alaska, and 296 gravimeter stations were occupied. Ties were made to 10 pendulum stations covering a gravity range of 1486 mgls., and a calibration
factor of 0.246804 mg!., per scale division was derived for the gravimeters. A study of profiles of elevation, Bouguer anomaly, magnetic intensity and lithology leads to the following general interpretation. A 60-mgl. negative anomaly a.cross the Rocky Mountains has been attributed to a 16,000-foot
crustal downwarp, while an anomaly of similar magnitude but with steeper gradients across the Cassiar Mountains is considered to be due to a mass of low-density granite occurring within the mountain system.
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