ELECTRICAL METHODS 



573 



The electrical survey gave indications of the presence of an area of 

 higher conductivity in the southwest quadrant of the crater between the 

 center and the rim. The main portion of the relatively conductive material 

 lies at an effective depth of approximately 700 feet. A careful study of the 



to too zoo 300 400 



eoo 000 woe 



Fig. 354. — Calculated resistivity curves and characteristic curve. Meteor Crater, Arizona. (A.I.M.E. 

 Geophysical Prospecting, Technical Paper, 1932.) 



original and altered materials found in the area indicates that this zone of 

 higher conductivity is not due entirely to fill material or structural condi- 

 tion. The conclusions are that this area contains material of metallic char- 

 acter. The material is probably a fragmental zone having its greatest length 

 in a general northeast-southwest direction. Subsequent to the geophysical 



