Profile A-B (figure 7) shows the characteristic continental slope 

 anomaly found off the east coast of the United States (U. S. Naval 

 Oceanographic Office Technical Report 133, pp. 11 through 23). Pro- 

 files B-C and C-D (figures 8 and 9) show no distinctive features other 

 than the normal geomagnetic gradient. 



Profiles F-G and I-J (figures 10 and 13) were made while crossing 

 over the Puerto Rico Trench. Profile F-G is relatively smooth over 

 the trench, but profile I-J shows what appears to be a small, positive 

 anomaly in the trench area. 



Profile H-I (figure 11) extends from the island of Saint Croix 

 across the Virgin Islands platform. This profile shows very high 

 amplitude magnetic anomalies on both sides of the platform. The 

 anomaly on the southern side is attributed to a fault of late Cenozoic 

 origin described by Schuchert (1935, p. 474). The anomaly on the 

 northern side is believed to be related to a fault described by 

 Butterlin (1956, p. 373). There are many short-wave-length anomalies 

 with steep gradients on the platform itself (figure 12, profile X-Y) . 

 These are attributed to the presence of basic igneous material a short 

 distance below the present ocean floor. 



Profile J-K (figure 10) shows a broad magnetic anomaly located 

 just east of the survey area. There is no evident bathymetric feature 

 associated with this anomaly. 



Except for several small magnetic anomalies associated with small 

 bathymetric features in the southernmost part, profiles L-M, M-N, and 

 N-0 (figures 14, 15, and 16) show no distinctive anomalies. 



