Discussion
A bed of true thickness 15 m met in a vertical borehole as a 30 m interval must be dipping at
Answer: A
True thickness equals the vertical interval times the cosine of the dip, so the cosine is 15 over 30, that is 0.5, and the dip is 60 degrees. A vertical borehole always overstates the thickness of a dipping bed, and steeply the more so.
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