By G. M. Bennison (auth.)
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Additional info for An Introduction to Geological Structures and Maps
I . ~ /" " <' ! >" / '~'-' ~ . <;,00/ - - - -, . N SCALE metres 500 ~OO<' <' I 0 Map 19 What kind of fault occurs on this map? Has it any vertical displacement? Draw a section across the map along a line intersecting the fault. Indicate on the map anticlinal and synclinal axial traces. 7"'. _. :. ---,- -- sea m -- .......... "_" __. -. -: - ----- ~ \ \ \ \ I I 0 Iu \ _. '~•••••. - ,~o::;. ::::::- .................... . I~ •••••••• .... I .... .. . .... ...... :;.... /a-!. . . . ·d····· -: .......
Down- throw angle of hade upthrow ang le of dip -/ -- -- - -- -:.... - - -... ...... ... .. . . .. .. . . . . • - • • • •• • •••• ••• i • ••• '--? WAN T HEAVE Fig. 22 Section through strata displaced by a normal fault (after erosion has produced a near-level ground surface) . Fig. 23 Section through strata displaced by a reversed fault. 27 On some geological maps, such as those produced in Canada and the United States, the direction of dip of fault planes is shown . The angle of dip of the fault plane may be given in the map description.
16) - naturally the outcrops of both limbs will be shifted in the same direction by a dip-slip fault. Of course the outcrops of the shallow limb will be shifted more than those of the steeper dipping overturned limb. Displacement of folds by strikeslip (wrench, faults A wrench fault causes a lateral (horizontal) dislocation or displacement of the strata which may in some case be of many kilometres. The effect of a wrench fault is to displace the outcrops of beds, always in the same direction - and its effect on the outcrops of simply dipping strata in certain circumstances is similar to that of a normal fault: it may not be possible to recognize from the evidence a map can provide whether a fault has a vertical or a lateral displacement (see p.
An Introduction to Geological Structures and Maps by G. M. Bennison (auth.)