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RI I I RI N('I `~ <br />Coates U F, 1970, Principles of Rock Mechanics, Deperiment of Energy, Mines and <br />Resources, Mines Branch Monograph R74, Qttawa, Canada. <br />Dubrin M, 1976, Introduction to Geophysical Prospecting, Third Edition, University of <br />} iouston. <br />(mull P S and West G F, 1965, Interpretation l~heory in Applied Geophysics, McGraw- <br />Hill Bcwk Company. <br />~- <br />0 100 700 700 <br />INI <br />I~igurc I -Scale cross-section thmugh the proposed quarry silt illuswting the <br />relationship of homes near the base of the Rollins sandstone outcrop to the highly jointed <br />cliff face (with joint surfaces dipping south 1. the location of the rock crusher. and <br />operation o}'dozers and shovels on the ridge xbin•e the cliff. An approximate final surface <br />is shown by the black curve where n 2:1 slolx is maintained below the south ridge crest. <br />