William Smith was an English geologist who created the first nationwide geological map of the UK. A geologic map reveals the distribution of geological features such as different types of rocks. Smith's beautiful 1815 map visualized Britain's geological types using different colors for different types of geological feature.
You can view interactive versions of William Smith's Maps online. These allow you to explore his geological maps of England, Scotland & Wales in close detail. The interactive map interface allows you to view geo-rectified overlays of a number of William Smith's maps including his original 1815 geological map and his 1828 New Geological Map of England and Wales.
Digital geological maps can add a level of interactivity to the visualized geological strata. In other words they can allow you to click on the different colors to learn more about the visualized geological features. A good example of this is the Geological Map of the Grand Canyon and Vicinity.
The Geologic Map of the Grand Canyon and Vicinity is a beautiful Leaflet.js based interactive map of the Grand Canyon. The map is based on data gathered by the U.S. Geological Survey.
The map uses different colors to show the different rock units and geologic strata in the Grand Canyon and surrounding area. The map also includes contour lines. If you hover over the map the geologic strata at that location is revealed in the small information window. If you click on the map you can learn more about that geologic strata in the information dynamically loaded below the map.
Another good example of an interactive geological map is the Geologic Map of Arizona. The Geologic Map of Arizona also includes interactive colored geological features. If you mouse over a feature on the map the geological information is shown on top of the map.
The Geologic Map of Arizona also visualizes different types of geological faults in Arizona. There is also a map legend which can be accessed by the 'View the legend' button. This legend isn't interactive but it would be possible to turn this legend into a menu which could be used to turn on and off the different geological strata (the different colors) on the map. This could be useful if you wanted to view all the locations with a specific type of geological feature while hiding all the other strata.
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