1. Structure Contour Maps
Show contours connecting points of equal elevation on a geologic surface…
Fault
Contact
Bed
Etc.
Show elevation of the top of some geologic feature.

3. Structure Contour Maps
Drawn with a specific contour interval
Trend of structure at any point is parallel to the contour at that point
Strike is tangent to contour
Dip is perpendicular to contour
Rules of thumb for spacing of contours is same as for topography.
Cross sections drawn using structure contours show shape and depth (elevation) of layer