geologic maps -- Maps that show the types and ages of rock of an area. These maps are used by paleontologists to find areas that are likely to contain fossils they are interested in.
Development of 3-D framework models begins with the assembly of primary data such as: digital elevation models (DEM), geologic maps, geologic cross-sections, and lithologic well logs.
In the United States, geologic maps are usually superimposed over a topographic map (and at times over other base maps) with the addition of a color mask with letter symbols to represent the kind of geologic unit, stratigraphic contour lines, ...
 See also: Geologic map, Surface, Area, Format, Information
  
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