. Bulletin - New York State Museum. Science. NEW YORK STATE MUSEUM. I'ig. 4 Figure 3 illustrating a strike, and figui-e 4 a dip fault. FF is the fault plane, AA, BB, and EE Indicate the dipping rock layers. In the former figure the fault plane cuts the surface parallel to the strike, causing a strike fault, in the latter the strike is cut at right angles, producing a dip fault. On the left the unfaulted hlock is shown, with the position of the fault dotted. In the center the conditions preyailing shortly after completion of the faulting are shown, the downthrow block on the right, and with the
. Bulletin - New York State Museum. Science. NEW YORK STATE MUSEUM. I'ig. 4 Figure 3 illustrating a strike, and figui-e 4 a dip fault. FF is the fault plane, AA, BB, and EE Indicate the dipping rock layers. In the former figure the fault plane cuts the surface parallel to the strike, causing a strike fault, in the latter the strike is cut at right angles, producing a dip fault. On the left the unfaulted hlock is shown, with the position of the fault dotted. In the center the conditions preyailing shortly after completion of the faulting are shown, the downthrow block on the right, and with the prominent fault scarp. On the right the conditions pre- vailing after sufficient time has elapsed for wearing away the upthrow block down to thp level of the other side, or rather for wearing the two sides down to a uni- form level, are indicated, this being approximately tbe condition of most of the faults of the region at the present time. In the strike fault this results in the entire^ dis- appearance from the surface of the stratum BB, in the vicinity of the fault, the actual thickness of rock so disappearing being comprised in the space between the dotted lines on either side of BB. By varying the amounts of hade and dip, or their directions, repetition of strata at the surface, instead of disappearance, may result. In the dip fault the effect is to shift the outcrop of a given stratum, so that in an old fault, the surface having been worn down, the ends are shifted for- ward or back, as the case may be, on opposite sides of the fault, as BB is shifted in the diagram. The amount of this shifting increases with increased throw of the fault, and diminishes with increased dip of the rocks. 1^'ew faults meet these condi- tions of correspondence with dip or strike direction exactly, but many make such slight angles with these directions that they, are practically Please note that these images are extracted from scanned page images that may have been digitally enhan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
