We report results of resistivity sounding of eight locations in the Cerro Chascon science preserve area. The soil resistivity near the surface was found to be ~1000 ohm m at the five locations in the Pampa La Bola area. The values at the three locations in the Llano de Chajnantor area were much higher, exceeding 3500 ohm m. This difference probably reflects differences in water content in the upper soil layer due to local topography and drainage. The depths of the upper layer of broken rock found at these sites are of order a few meters, and are consistent with depths found from borehole cores obtained near each location.
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