It is generally conceded that estimates of depths to magnetic sources using the methods of Vacquier et al (1951) may be 10 percent or more in error, even for anomalies well-suited to depth estimates. Where conditions are less favorable--for example, where the anomaly-producing masses differ in magnetization or shape from the assumed uniformly magnetized vertical prisms--the errors may be much larger. In my opinion, therefore, Dr. Steenland has attempted to obtain more from the magnetic data than is warranted.

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