Activity 2: Streams and the Rule of Vs
   
Practicing with Strike and Dip
The applet on this page will help visual how the interaction between a valley and the attitude of a geologic unit determines the resulting map pattern. It has the geologic strata of interest located near the top of the sequence of rocks cut by the valley. Compare the resultant outcrop patterns to that produced by a unit in the center of the sequence. To change the dip of the geologic unit, move the top slider to the right or left. The strike can be adjusted by moving the bottom slider.

   

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Using the applet, answer the following questions:
  1. How does the outcrop appear in the valley when the unit is horizontal?
  2. If the unit is vertical and strikes east-west, how does the outcrop pattern appear in the valley?
  3. For a unit that dips 45o to the north, which way does the outcrop point in the valley? (Assume an east-west strike.)
  4. If the dip is 45o to the south, which way does the outcrop point in the valley? (Assume an east-west strike.)
  5. As the angle of the dip increases, is the outcrop pattern in the valley longer or shorter?
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