. Early geophysical papers of the Society of Exploration Geophysicists . 2720 3700 Fig. i.—Observed temperatures in Moffat tunnel, Denver, Colorado. rocks are supposed to be sufficiently plastic to yield to the pressure induced by the lighter strata above them and at the same time they are supposed to possess sufficient strength to carry the load imposed upon them. Quite curiously, advocates of each hypothesis have appealed to geothermal data as a means of deciding the issue. Osmond Fisher (12) contended that the isogeotherms beneath a mountain may pass from the convex to the plane type and ul
. Early geophysical papers of the Society of Exploration Geophysicists . 2720 3700 Fig. i.—Observed temperatures in Moffat tunnel, Denver, Colorado. rocks are supposed to be sufficiently plastic to yield to the pressure induced by the lighter strata above them and at the same time they are supposed to possess sufficient strength to carry the load imposed upon them. Quite curiously, advocates of each hypothesis have appealed to geothermal data as a means of deciding the issue. Osmond Fisher (12) contended that the isogeotherms beneath a mountain may pass from the convex to the plane type and ultimately become concave upward. Lees (13) rejects this hypothesis. He does not believe that a mountain has solid roots extending downward into a plastic substratum and that the isogeotherms pass from the convex to the concave type. In another publication, the writer will give a detailed application of Lees's equations to the temperature data obtained by the writer and Burgis G. Coy, resident engineer, in the Moffat tunnel. These observations are shown in Figure 1. The values, F. at the en- trances of the tunnel, and F. at the apex of the mountain were obtained by adjusting a straight line to the observed annual mean 538
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