Fig. 194. Ridges to be explained by Faulting
7. Copy the diagram in [Figure 194], showing how the two ridges may be accounted for by a single resistant stratum dislocated by a fault. Is the fault a strike fault, i.e. one running parallel with the strike of the strata, or a dip fault, one running parallel with the direction of the dip?
Fig. 195. Earth Block of Tilted Strata, with Included Seam of Coal cc
8. Draw a diagram of the block in [Figure 195] as it would appear if dislocated along the plane efg by a normal fault whose throw equals one fourth the height of the block. Is the fault a strike or a dip fault? Draw a second diagram showing the same block after denudation has worn it down below the center of the upthrown side. Note that the outcrop of the coal seam is now deceptively repeated. This exercise may be done in blocks of wood instead of drawings.
Fig. 196. A and B. Repeated Outcrops of Same Strata