Structural geology . Fig. 51. Figures illustrating (a) ideal parallel and Van Hise. (b) ideal similar folds. After 108 STRUCTURAL GEOLOGY FOLDS IN THE ZONE OF FRACTURE AND ZONE OF FLOW CON-TRASTED Rocks are folded by fracture or flow or by any combinationof these two processes. Folds therefore appear in either the zoneof fracture or the zone of flow or in the zone of combined fractureand flow. Folding by fracture differs in certain essential charac-teristics from that by flowage.

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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1913