380 
PACIFIC SCIENCE, VoL XIX, July 1965 
died with the decrease in the depth to the 
Mohorovicic discontinuity. 
Similarly, the more complete reduction of 
the magnetic data does not alter the gross pic- 
ture presented by Malahoff and Woodard (in a 
forthcoming issue of Pacific Science ) based on 
a preliminary reduction of the "Surveyor” data. 
As indicated by the depth analysis by Malahoff 
and Woollard, the depth of origin of the anom- 
aly is somewhat greater (8.5 km) than the seis- 
mic depth to the Moho (5. 8-7.0 km). The ex- 
planation for this discrepancy can be attrib- 
uted to (a) the lack of precision in magnetic 
depth estimates, or (b) a difference in the 
depth at which there is a concentration of ferro- 
magnetic minerals from gravity setting of heavy, 
early-formed minerals in an intrusion. Of the 
two explanations, the latter is considered the 
more probable in this case. 
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