The variation in the thickness of the earth's crust along the composite east-west profile in northern and middle California has been investigated on the basis of pendulum gravity data published by J. A. Duerksen. The earth's crust is about 24 km thick beneath the California coast line, and the thickness increases inland until it is 50 km at a point 350 km from the coast line. It has been deduced also that the deposits in the Central Valley increase in density rapidly with depth so that at depths of a few kilometers there is no appreciable density contrast with the basement rocks.

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