Pressing flowers between pages…
Removal of strata dip-and-strike effects at each collecting station by rotation in three-dimensions increases resolution of data concerning the orientation of joint surfaces in sedimentary rocks. Contoured equal-area diagrams of unrotated and rotated joints illustrate the changes in joint plane pole maxima. Jointing in sedimentary rocks upturned along two trends of the Grand Hogback Monocline, Colorado, is inferred as being related to vertical uplift rather than to horizontal compression or superposition of a regional joint system. The joints may have been caused by tensional stresses developed within the strata by the inherent slowness of rocks to relax from a prestressed condition created by deep burial.
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