The English geologist William Smith is credited with creating the first nationwide geological map. A geologic map reveals the distribution of geological features such as rock units or geologic strata. 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 geological maps of England, Scotland & Wales at William Smith's Maps).
Macrostrat is a collaborative platform for geological data exploration and integration. They claim to have the world's largest geologic map database. Their interactive Geologic Map allows you to explore the geology of the whole world. If you click on the map you can view information on the age, lithology and geologic strata at your selected location. The Macrostrat Geologic Map also includes an option to view elevation profiles. If you select elevation profile from the map menu you can draw a line between any two points on the map to view an elevation chart beneath the map.
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