Structural Analysis and Synthesis. Stephen M. Rowland

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Structural Analysis and Synthesis - Stephen M. Rowland


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be used. In Bree Creek the 400‐ft contour interval does not allow the difference in elevation from the base to the top of a unit to be precisely determined. In such cases, orthographic projection can be used to determine stratigraphic thickness.

      Line AB is drawn perpendicular to the two strike lines (Figure 2.21a). This represents the 4800‐ft elevation line in the orthographic projection. A second line, CD, is drawn, perpendicular to the two strike lines. Line CD represents the 4400‐ft elevation line. The distance between lines AB and CD is taken directly off the map. Next line AD is drawn, which represents the eastward‐dipping top of Tg in orthographic projection.

Schematic illustration of three combinations of sloping topography and dipping layers, with the appropriate formula for each. Schematic illustrations of technique for determining stratigraphic thickness by orthographic projection. (a) Plotting top surface. (b) Plotting bottom surface and deriving the thickness. Schematic illustration of a map of an area showing contacts and topographic contours. Schematic illustration of a cutout to produce a block model of the area in Figure P2.1 to visualize the three-dimensional geology. Schematic illustration of a base map showing locations of wells to be used in Problem 2.2. Schematic illustration of a topographic contour map to be used in Problem 2.3 showing locations of wells A, B, and C, leaking industrial landfill, and traverse where cross section (X–X′) should be drawn. Schematic illustration of a bopographic base map with outcrop locations to be used in the solution of Problem 2.4.

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