Discussion
A bed dipping at 45 degrees and exposed at the surface will be encountered by a vertical borehole 100 m along the dip direction at a depth of
Answer: C
Correct answer: 100 m
\[ d = x\tan\delta = 100 \times \tan 45^\circ = 100\ \mathrm{m}. \] A dip of 45 degrees is the case in which the depth equals the horizontal distance, which makes it a convenient check on the arithmetic. Note the distance must be measured in the dip direction; along strike the bed never gets any deeper.
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