Discussion
A bed of true thickness 20 m dipping at 30 degrees crops out on level ground over a width of
Answer: A
Correct answer: 40 m
\[ w = \frac{t}{\sin\delta} = \frac{20}{\sin 30^\circ} = \frac{20}{0.5} = 40\ \mathrm{m}. \] The gentler the dip, the wider the outcrop of a bed of given thickness - and a horizontal bed of any thickness would in principle crop out over the whole area at its level, which is why gently dipping strata dominate a map so disproportionately.
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