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GG303 Lab 3
9/6/11
1
Three Point Problems and Map Interpretation
Exercise 1
(29 points total)
Three points with the following coordinates lie on a planar bed:
A: 100m N, 400m E, 400m elev;
B: 0m N, 0m E, 200m elev;
C: 300m N, 0m E, 500m elev.
You are asked to find the orientation of the
plane as in the example of 3.1.
Round your answers to the nearest degree
.
1a
Plot and label the points on a separate piece of paper using a scale of 5 cm = 250 m.
Put
the origin in the center of the page, and draw the eastaxis parallel to the long dimension
of the page
.
(3)
1b
Add a correctly dimensioned scale bar and a north arrow. (2)
1c
Draw and label a line of strike (structure contour) through pt A for the bed (2)
1d
Determine to the nearest 45° (i.e., N, NE, E, SE, S, SW, W, or NW) the direction of dip and
write it here: direction of dip = _____________(1)
1e
Measure the strike of the bed (use the righthand rule) and write it here:
strike = _______(2)
1f
Draw a dashed cross section line (fold line) through point E (plot E at 0m N, 200m E) that
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 Fall '11
 StephenMartel

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