https://ctech.com/studio_help/file-format-details/geology-file-examples-figures/geologic-file-example-sedimentary-layers-and-lenses/index.htmlGeologic File Example: Sedimentary Layers & Lenses Both example files below represent valid forms for the geology file associated with the above figure. For file 1, line 2 of the file is “1”, therefore all surface elevations are entered as actual elevations relative to a fixed reference such as sea level (not depths) and the relationship between x, y, and elevation must be a right handed coordinate system. Note that X and Y corresponding to Eastings and Northings are used. Be careful not to reverse these.Hugoen-us