Seismic refraction measurements, from Princeton to Barnegat Bay, New Jersey, have been made as a continuation of similar measurements of the depth of the crystalline basement made at Cape Henry, Virginia, and Woods Hole, Massachusetts, in 1935. The standard technique for seismic refraction measurements was followed. The observed depths are in agreement with the well logs of two deep wells extending to the basement. A geologic section constructed from these measurements is in agreement with known geologic and gravitational data.

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