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Map Patterns and Finding the Strike and Dip from a Mapped ...

Map Patterns and Finding the Strike and Dip from aMapped Outcrop of a Planar SurfaceTopographic maps represent the complex curves of earth s surface with contour lines thatrepresent the intersection of those curves with (imaginary) horizontal surfaces at regular in-tervals. Planar geologic structures, such as bedding contacts and faults, also intersect theearth s surface along lines. You have seen how folded beds intersecting a flat surface makecurved lines showing the hinges and limbs of the folds, and can be interpreted to determineaspects of the 3D geometry such as the plunge direction of the folds. In this lab you willexplore the intersection of planar features with complex topography which creates mappatterns and how to use these Patterns to interpret the 3rd bedsThe simplest case is one of horizontal bedding intersecting a horizontal flat landscape.

Figure 10: Two possible lines in a dipping plane (or paths to walk down a steep roof). The steepest one is the true dip. The other one will always be shallower slope (smaller apparent dip). Figure 11: A: Plane is seen in a cross section which is cut perpendicular to the strike of the plane (parallel to, or containing, the line of true dip).

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