Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 OBSERVED GRADIENTS SECTION OF FOLDED BEDDING SURFACE EOTVfis UNITS ROBERT K. MILLER. GEOLOGIST a ENGINEER 308 H W. HELLMAK LOS L. Fig. i active through a long period of time, and deposition and erosion occur contemporaneously in many places so that the formations at depth may be more folded than those at the surface. The effects of distance, how- ever, more than offset the greater degree of folding that may occur at depth, so that only t
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 OBSERVED GRADIENTS SECTION OF FOLDED BEDDING SURFACE EOTVfis UNITS ROBERT K. MILLER. GEOLOGIST a ENGINEER 308 H W. HELLMAK LOS L. Fig. i active through a long period of time, and deposition and erosion occur contemporaneously in many places so that the formations at depth may be more folded than those at the surface. The effects of distance, how- ever, more than offset the greater degree of folding that may occur at depth, so that only the folding of the surface formations has an appre- ciable effect on the distribution of gravity at the surface. When a whole series of formations is folded, the series may be divided into members that react to folding in the manner of rigid bodies and those that flow plastically or slip on cleavage planes; otherwise the strain in the ma- terials would exceed all possible limits. It is not necessary to assume that sand beds exhibit the properties of rigid bodies and that under linear compression shales flow plastically, but it is a fact that surface sand formations, within 1,000 or 2,000 feet of the surface, when folded, assume a form that only rigid bodies would acquire under the circum- stances. If allowances are made for the effects of friction, this form may 131
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