Illustrations of the geology that lie vertically below the line defining the position of that section on a map.
The line of section can be one straight line or a number of straight lines, each joined to its neighbor but following a different direction from its neighbor, or occasionally, the line can be curved. The vertical scale used in most geological cross sections differs from the horizontal scale so that detail over a vertical distance of tens of meters can be shown over horizontal distances of thousands of meters. This means that distance on these sections can only be measured accurately in the vertical and horizontal direction. Any angle measured between points on such a section is a distortion of the real angle between those points. For engineering purposes, it is therefore advisable to use vertical and horizontal scales that are identical.
The accuracy of sections is usually constrained by boreholes where the vertical profile is known correctly; extrapolations...
- Excellent tutorials on U-tube; Insert drawing geological cross sections. e.g. Oregon State University (OSU ECampus). https://www.youtube.com/watch?v=Vgo8Z63n60g