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The present paper describes some of the geophysical results that ultimately led to the discovery of the Wasatch trench, Utah, as a great structural feature extending along the west side of the Wasatch Range for a distance of about 160 miles (Cook and Berg, 1956, 1958, 1961; Cook, 1962, p. 325; Cook et al., in preparation for publication). The investigation was part of a broad geophysical study of the eastern part of the Basin and Range Province.

Intermittently during 1956 to 1958, a seismic and gravity profile was taken across the area which is now known to constitute the northern part of the Wasatch trench. The profile extends in a generally eastward direction between Little Mountain South and the northern Wasatch front in the vicinity of Ogden and North Ogden, Utah (Figure 1). In June 1958, 28 seismic stations were taken along the profile for a distance of 15 miles between Little Mountain South and North Ogden. The immediate object of the survey was to determine the major subsurface geologic features of the area with special emphasis on the existence of Basin and Range faulting. The long-range objective of the survey was to attempt to perfect seismic techniques to chart effectively and most efficiently the location and character of Basin and Range faults and the thickness of rocks of Cenozoic age in the basins.

In 1956, a gravity profile, with approximately one-mile spacing between stations, was established across the valley from Little Mountain South to the Wasatch front,

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