Geological and topographical maps, their interpretation and use, a handbook for the geologist and civil engineer . Fig. 56a.—Section ofStrike-fault showingNarrowing of Out-crop. Fig. 566.—Section ofStrike-fault showingWidening of Out-crop. The effects of these small strike-faults on the outcropswill be first considered, and can best be detected bycomparing the width of the outcrop in which they occurwith that of the same rock where unfaulted. It will befound that the faulted outcrop is wider or narrower than. Fig. 57a. — Section of Strike-fault showing Concealment of Outcrops, Fig. 576.—Sectio
Geological and topographical maps, their interpretation and use, a handbook for the geologist and civil engineer . Fig. 56a.—Section ofStrike-fault showingNarrowing of Out-crop. Fig. 566.—Section ofStrike-fault showingWidening of Out-crop. The effects of these small strike-faults on the outcropswill be first considered, and can best be detected bycomparing the width of the outcrop in which they occurwith that of the same rock where unfaulted. It will befound that the faulted outcrop is wider or narrower than. Fig. 57a. — Section of Strike-fault showing Concealment of Outcrops, Fig. 576.—Section of Strike-fault showing Duplicationof Outcrops. the normal one according to the direction of throw of thefault. Take first the case where the downthrow is in thesame direction as the dip (Fig. 56a). Here the width of the unfaulted outcrop would beab, but owing to the downthrow it is narrowed by theamount ac. Fig. 566 illustrates a throw in the opposite direction, 78 GEOLOGICAL AND TOPOGRAPHICAL MAPS and it will be seen that the outcrop is widened by theamount yz. With a greater throw the outcrops may be concealedor duplicated as seen in Fig. 57 a and b. a O a c 0 o a o o o O o G o o -T- . 1 , , 1 . 1 . 1 . 1 , 1 , 1 ^-L— -!-j—J—?— -. 1 , 1 , 1 n—L I 1 J—, , 3^ ° *J^ —-J-- ;& /* h:. Fig. 58.—Plan of Outcrops in the Neighbourhood of aStrike-fault with Diminishing Throw. In the case of a strike-fault with a diminishing throw,the outcrops may appear as in Fig. 58,an arrangemen
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