A large gravity low of about -40 mGals lies over Hualapai Valley, which is within the transition zone between the Basin and Range province and the Colorado Plateau in northwestern Arizona. The low represents a bedrock depression containing several thousand feet of Cenozoic sedimentary and volcanic rocks, and deposits of halite and other evaporites. Data indicate that a salt body, as much as 8 km (5 mi) wide and 1830 m (6000 ft) thick lies below 460 m (1500 ft) of sediment in the center of the valley. The gravity data suggest that the salt extends over a distance of 19 km (12 mi).
This report is preliminary and has not been edited or reviewed for conformity with Geological Survey standards Magnetic susceptibilities of crystalline rock samples,
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