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question #19


16. Complete the hypothetical geologic map on the next page by using hypothetical strike-and-dip
measurements that were recorded from 10 different outcrops located on this map. The numbers on
the map refer to the numbered outcrops, so draw your strike-and-dip markers next to the appropriate
number on the map. (6 pts.)
These are the strike and dip measurements (listed below as strike, dip, and dip direction) from the 10
1. 124, 22 NE
6. 127, 38 SW
2. ~horizontal
7. 120, 27 SW
3. 120, 20 SW
8. 096, 20 SW
4. 024, 18 SE
9. 120, 20 NE
5. 140, 40 NE
10. 143, 35 NE
Once you complete the map, answer the following questions:
17. Does the pattern of strike-and-dip measurements suggest an anticline or a syncline? (1 pt.)
18. Draw in the axis of the fold as a dashed line running across your map. (The axis of the fold is the
point at which the dip goes to zero and the dip direction on either side is in opposite directions.) (2 pts.)
19. Imagine that you take a slice through the ground along the line marked X-Y on the map. Draw a
cross-section of what the underground geometry of the rock layers would look like. Label which layers
are Rock A, and which are Rock B. The X-Y line on the map is longer than the width of this box, but you
should be able to scale your cross section accordingly. (3 pts.)
1000 ft.
layers of
layers of
1 mile
and dip
15 of 17

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