IV. SURVEY RESULTS AND DESCRIPTION OF FEATURES 



A. South Bahama Area Survey 



As a result of this survey, the geomagnetic field and bathymetry 

 of an 18,000-square mile oceanic area near the southern Bahama Islands 

 have been charted in detail. Magnetic total intensity contours and 

 residual magnetic intensity contours are shown in figures 3 and 5 

 respectively. Bathymetric contours are shown in figure 6. The simul- 

 taneous collection of magnetic and bathymetric data allows direct cor- 

 relation between the magnetic and bathymetric charts of this area. 



The residual magnetic contour chart (figure 5) shows three sig- 

 nificant magnetic lineations in the survey area. The most pronounced 

 of these magnetic trends is located in the southern part of the area 

 where the anomalies strike N74°W. This direction parallels structural 

 trends in Jamaica, central Cuba, and in the northern part of Hispaniola. 

 These structural trends are believed to have been established in the 

 Jurassic and late Cretaceous periods (Schuchert 1935, pp. 413; 483). 

 The anomalous trend does not have any definite association with bathy- 

 metric features in the survey area. Using empirical slope techniques, 

 depth estimates indicate that the top of the magnetic source of the 

 anomaly lies at a depth of 11 nautical miles below sea level. 



On the northwestern side of the survey area is a second magnetic 

 trend. This trend, striking N50°W, is parallel to both the strike of 

 the southern Bahama Islands and the bottom features on the northwest 

 and southeast sides of the area (figure 6). 



The third magnetic trend, evident in the northeastern section of 

 the area, strikes N31°E. This trend is a very pronounced series of 



