Recent investigations in previously poorly covered areas and with new techniques have extended our knowledge of the structure of the continental margin of eastern North America. The sedimentary trough under the continental rise has been better defined by seismic profile data and structural trends have been followed by magnetic measurements. Among the features recently identified is a structural offset at 40° North Latitude which appears to be a transcurrent fault offshore

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and is represented by a change in trend of Triassic and older rocks ashore. The implications of this and other newly established features are discussed.

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