The writer has observed that when the origin and local relations of parts of a geologic structure are not clearly seen from a study of the surface or subsurface contour map, a model of the structure has been of much value. In a large number of instances models are not worth their construction, especially when the structure is simple. However, where faults, sharp synclines, terraces, and other such features are present, the model becomes of much service in studying the relation of any one of them to the whole. This is more especially true when the structure is large. The...
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