Discussion
Plotting pitch is useful when rocks contain :
Answer: A
Plotting pitch is useful when rocks contain a Lineation.
Pitch (or rake) is the angle between a linear feature and the strike line, measured within the plane that contains it. It is used for lineations such as slickenlines, mineral elongation or fold hinges lying on a foliation or fault plane, especially when the plane dips steeply and the plunge is hard to measure directly.
Foliation, gneissosity and parting are planar structures, recorded by strike and dip, so pitch, a measure for lines within a plane, does not apply to them.
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