A section, usually with the vertical scale considerably exaggerated with relation to the horizontal scale, that is designed to show the thicknesses and stratigraphic relationships of successions of named lithostratigraphic units. For simplicity, the upper part of one of the units is restored to a horizontal position and topography is ignored. Items such as facies changes, interdigitating of units, unconformities, and breaks in succession are shown. The units and their boundaries are related to the subdivisions of geologic time.