What features are generally found on a geologic map?
1. MapGeologic maps are idealized pictures of the distribution of earth materials at or near the ground surface.
The description of map units defines each earth material (map unit) shown on the geologic map. Each map unit is defined by its own unique color, name-abbreviation, and text describing physical characteristics.
5. Correlation of map units
The correlation of map units shows the relative age of each type of earth material (map unit) shown on the map.
This element may be absent from a geologic map when the units simply stack one on top of another, from oldest to youngest. In this case, the explanation does double duty, describing each unit and presenting it in the order of its relative age.