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Geological map
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{{Short description|Special-purpose map to show geological features}} {{More citations needed|date=January 2025}} [[Image:World geologic provinces.jpg|thumb|300px|Mapped global geologic provinces]] A '''geological map''' or '''geologic map''' is a special-purpose [[map]] made to show various geological features. [[Rock (geology)|Rock]] units or [[stratum|geologic strata]] are shown by color or symbols. [[Bed (geology)|Bedding planes]] and structural features such as [[fault (geology)|faults]], [[fold (geology)|folds]], are shown with [[strike and dip]] or [[trend and plunge]] symbols which give three-dimensional orientations features. [[Stratigraphy|Stratigraphic]] [[contour line]]s may be used to illustrate the surface of a selected [[stratum]] illustrating the subsurface [[topography|topographic]] trends of the strata. [[Isopach map]]s detail the variations in thickness of stratigraphic units. It is not always possible to properly show this when the strata are extremely fractured, mixed, in some discontinuities, or where they are otherwise disturbed. [[File:Geological map Britain William Smith 1815.jpg|thumb|[[William Smith (geologist)|William Smith]]'s geological map]]
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