Can someone explain this problem to me? It hits me like a truck full of unknown terminology... I imagine you would want to use a stereonet because it has something to do with cardinal degrees, but I'm not sure where one would get (or make) tracing paper and stereonet prints.
A sandstone bed strikes 067° and dips 21° SE. In the bedding plane, it is observed that
there are slickensides pitching at 58 degrees east. What is the trend and plunge of the
slickensides? (Give trend as an azimuth. No Cardinal Direction needed for plundge.)
Yep, it's a stereonet problem (trust me, I'm not fond of them either), but in terms of getting the stereonet, usually I just print one off the Internet and use regular tracing paper and a pin because you place the tracing paper on top of the stereonet and rotate it around the center (where you use a pin to secure that) to plot the points and planes needed.
And with the terminology, I think it's best to think of it three-dimensionally instead of as vocabulary terms:
The first picture does show the strike as the line on the plane, but it would actually be 30 since the strike in terms of this picture would be the angle between that double-arrowheaded line and north, sort of like measuring a bearing.
An azimuth is basically the angle between north and a contour, kind of like this except think of the altitude dipping down instead of up (as you would be measuring for a slope downhill instead of a star up in the sky). In fact, the strike is basically an azimuth measurement, especially when doing the three-point problem.
Slickensides are geological features that are basically smooth surfaces caused by movement of faults applying pressure to each other, kind of the effect of sandpaper on wood (except neither of the two layers rubbing against each other would be as thin as sandpaper). Do not confuse these with slickenlines, which are grooves in the surface carved out by fault movement.