Faults Faults Dip slip faults o Fractures in rocks where displacement slippage has occurred o Classified by their relative movement o Movement is along the dip inclination of the fault surface o May produce long low cliffs called fault scarps o Parts Hanging wall rock surface above the fault Footwall rock surface below the fault Types of dip slip faults o Normal faults forces o Reverse Faults Hanging wall moves down relative to footwall Accommodate lengthening or extension of the crust tensional Hanging wall block moves up relative to footwall block Accommodate shortening of the crust Thrust fault low angle reverse fault Strong compressional forces Strike slip faults o Displacement is along the strike directional trend of the fault o Types of strike slip faults Right lateral Facing the fault the opposite side moves to the R straddling the fault the R side moves toward you Left lateral Facing the fault the opposite side moves to the L Joints o Common rock structures o Fractures with no movement o Occur in roughly parallel groups Significance of Joints o Chemical weathering concentrated along joints o Mineral deposits emplaced along joint systems o Can represent rick to construction projects