Discussion
Core orientation is required in order to
Answer: A
Correct answer: establish the true dip and strike of the discontinuities
A core recovered from a vertical hole records the angle a joint makes with the core axis but not the direction it faces, since the core is free to rotate as it comes up. Orienting it - by a scribe, an impression packer or an oriented core barrel - restores the missing information, which is what stability analysis requires.
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