Geological and topographical maps, their interpretation and use, a handbook for the geologist and civil engineer . Fig. 12.— Recumbent Fold. very well-marked characters, it is in consequence almostimpossible to detect this repetition in the field. Types of fracture other than thrust planes are pro-duced by the action of gravity upon masses of the earthscrust detached from the surrounding blocks by shrinkage. Fig. 13.—(a) Vertical Isoclinal Fold, (b) Inclined Isoclinal Fold. or otherwise, and these are usually known as normalfaults/ since they are the most commonly occurring fault plan
Geological and topographical maps, their interpretation and use, a handbook for the geologist and civil engineer . Fig. 12.— Recumbent Fold. very well-marked characters, it is in consequence almostimpossible to detect this repetition in the field. Types of fracture other than thrust planes are pro-duced by the action of gravity upon masses of the earthscrust detached from the surrounding blocks by shrinkage. Fig. 13.—(a) Vertical Isoclinal Fold, (b) Inclined Isoclinal Fold. or otherwise, and these are usually known as normalfaults/ since they are the most commonly occurring fault plane is usually steeply inclined, and isfrequently polished and striated in the direction of themovement which has taken place along it. The term slickenside is applied to such a polished and striated c 34 GEOLOGICAL AND TOPOGRAPHICAL MAPS surface, and it often serves to indicate the direction inwhich the movement has taken place. From a study of slickensides, the existence of move-ments may sometimes be detected, when there is noactual displacement of the relative levels of the strata onthe two sides of the fault plane. This may occur when,for example, successive blocks of strata have been dis-placed under the action of gravity in such a manner thatthe masses have come to rest at the same level, so thatthere is no remaining throw between contiguous blocks,although well-marked slickensides are to be s
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