From an inspection of the general character of the magnetic profiles shown in 
Figure 30, the wave length of the magnetic anomalies can be seen to decrease mark- 
edly over the Pacific - Antarctic Ridge. This is accompanied by an increase in 
amplitude of the anomalies. The ship tracks crossing the ridge are separated by dis- 
tances which are, in general, several time the wavelengths of the individual anoma- 
lies; thus, the question of whether individual magnetic features carry through from 
one profile to the next cannot be settled with certainty in every instance. However, 
it is apparent that some features do carry through from one profile to the next. These 
include several individual features having distinctive character and certain groups of 
related features. This carry through provides evidence that elongated magnetic line- 
ations exist in a direction roughly parallel to the ridge. The evidence is strengthened 
by the magnetic character of the long track that parallels the ridge (1200, 14 March 
to 1200, 19 March). This track clearly shows longer anomaly wavelengths than appear 
on tracks at right angles to the ridge. Existence of such magnetic lineations was re- 
ported off the west coast of the United States by Mason and Raff (1961). It is believed 
that this area surveyed along the Pacific - Antarctic Ridge provides the first consistent 
evidence of magnetic lineations other than those located off the United States west 
coast. In the Antarctic, however, the lineations appear to trend in an east-northeast 
direction, parallel to the Pacific - Antarctic Ridge; off the west coast of the United 
States, the lineations trend in a north-south direction parallel to the postulated exten- 
sion of the East - Pacific Rise. Various possible explanations to the origin of the line- 
ations off the United States west coast have been advanced. Among these is the possi- 
bility that the lineation pattern may be caused by forces related to the earth's rotation. 
Instead, it now appears that in both of these areas, the lineated patterns may be charac- 
teristic of oceanic rises. Thus, the patterns may be an indication of the processes by 
which the rises were formed. 
The track presented in Figure 32 shows very pronounced bathymetric relief. In 
this respect, this area of lineations in the Antarctic is unlike the similar area off the 
United States west coast. Off the west coast, the lineations were present but there 
was no corresponding bathymetric relief. Analyses of possible correlation of the mag- 
netic and bathymetric relief undoubtedly is complicated by complex nonhomogeneous 
magnetic properties of the underlying rocks. However, close comparison of the mag- 
netic relief with the bathymetric relief indicates a relationship that had not been 
anticipated. Figure 32 shows magnetic intensity lows over many of the bathymetric 
highs; at the same time, there are magnetic intensity highs over many of the bathy- 
metric lows. This is the opposite of what normally would be expected if the magnetic 
anomalies were assumed to be caused by induced magnetic polarization of the rock 
comprising the bathymetric relief. 
The bathymetric feature shown at time 0530 (Fig. 32) is an example of this inverse 
relationship. To produce the associated magnetic anomaly for this bathymetric feature 
81 
