RockWorks illustrates stratigraphic surfaces and thicknesses using grid models. A grid model contains the X and Y location for each grid node, and a Z value for each node which represents the formation's surface elevation. One way grid models can be represented is as a 2D contour map.
If you are illustrating multiple surfaces in a profile, fence, block, or 3D thickness diagram, the program grids each formation's surface and base independently, and then stacks them in the display.
RockWorks can also save the elevation information in a 3D stratigraphic solid model. This is a type of a solid model in which there are fixed X (easting), Y (northing), and Z (elevation) coordinates, and also a 4th "G" variable which represents rock type. The rock type / G value association is declared in the Stratigraphy Types Table. The stratigraphy solid can be run through the Stratigraphy | Volume tool in the Borehole Manager, and it can be filtered using the Solid menu tools in the RockWorks ModOps menu.
