A geologic map can help a geologist see the Earth's rocks that lie on the surface.
This geologic map is of Texas during the year 1992. The three eras are broken down as the map's legend. Each rock has it's own color pattern during it's time era. For instance, during the Mesozoic era, the rock patterns are shades of green.
Map url: geoweb.tamu.edu/.../grossman/GeologicTX.jpg
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