Isostatic anomalies result from various two-dimensional structures such as large sedimentary basins and geosynclines. It is shown that a basin should be surrounded by a “halo” of positive anomalies and that the areal extent of the sedimentary layers and the dip of the lower contact are more important than thickness in producing the isostatic anomaly. The computations are applied to a coastal plain in order to interpret Vening Meinesz' findings that on many offshore profiles the anomaly increases algebraically away from the coast. Considerable computations are necessary before one can determine the amount of time lag between the deposition of sediments and the attainment of complete isostatic compensation.

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