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Close examination of zones of deformation bands in the Entrada Sandstone (Middle Jurassic) near Durango, Colorado suggests that the width of these vertical zones and the displacement across them is directly related to the porosity of the sandstone. Low porosity sandstone is less susceptible to fracturing than high porosity sandstone because greater energy is required to propagate cracks through quartz grains and calcite cement than through pore space. This observation is considered a field confirmation of the experimental work by Dunn et al. (1973)
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