Figure F10. Determination of the orientation of a geological plane (shaded) from two auxiliary measurements. The first auxiliary measurement is done on the flat-lying split core surface and consists of measuring the bearing α1 and the plunge angle β1 of the trace of the plane on the split surface. The second auxiliary measurement is done on a surface perpendicular to the flat-lying split core surface and contains the core axis and consists of measuring the bearing α2 and the plunge angle β2 of the trace of the plane on the surface.
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