1. Consider a sequence of perfectly parallel bedding planes defining a series of sedimentary deposits,
Formations A, B, C, D etc which strike exactly N-S, dipping to the east at 15°. Formation A is the
youngest.
Assume that the ground surface is flat and horizontal (i.e. eroded perfectly flat after the beds were
deposited and later tilted). The elevation of this flat surface is 500 m above sea level.
The following sketch is provided so that you’ll all use the same x & y coordinates (Northing & Easting)
a) Assume each bed is exactly 20m thick and sketch a geologic map, labeling each formation.
Show the scale of your map.
b) Draw an east west cross-section at the same horizontal scale and with no vertical
exaggeration (i.e. “natural scale”). Draw the map again with 10x vertical exaggeration.
c) Okay now let’s go to the real world where the ground surface isn’t a perfect horizontal plane.
Draw a geologic map if the ground surface is defined by the contour map on the following
page.
(Hint, you might need to make a series of cross-sections and then assemble your map.
N
E
600 m
Top of Fm A
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