From temperature measurements in two deep drill holes at Cobar, N.S.W., the mean geothermal gradient was calculated as (0.63±0.03)°C/100 ft, with a mean extrapolated surface temperature of (21.5±1.0)°C. Determination of thermal conductivity on 16 sections of drill cores from the same holes gave a mean of (10.6±1.1) mcal/sec cm °C. The geothermal flux was (2.18±0.33) μcal/cm.2sec.
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Marne et al. (1962) studied this question.
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