Strike/dip symbols introduced in chapter 3 can represent the local orientation of a geological bed. There is however another way to represent the shape of complex geological structures in a more complete way: by means of structure contours. Structure-contour maps are introduced in section 5-1. How to determine strike and dip from these maps is then explained in the second paragraph. The final to paragraphs illustrate the effect of the topographic relief on the outcrop patterns of planar, inclined layers in respectively thick an thin beds.