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Figure MP-5 <br />i <br />• <br /> <br />Bench Instability Development Process <br />`_~~ ~?9i~S4~dce <br /> <br />West ~ <br />Bedding planes parallel to dip. <br />Tilted at about 30-35 degrees by <br />mountain uplift to west. <br />Bedding Planes <br />~'~ <br />Bench ' ~ <br />Bench \ <br />'. <br />Bench <br />'~ <br />New benches cut across the bedding planes <br />of the formation. This exposes the bedding planes <br />to rapid weathering. <br />Fallen pieces of benches <br />Bench surface decays to a slope due to weathering <br />along bedding planes. <br />Protection from weathering should reduce decay. <br />Page 17 <br />