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Generalized Geologic Map of the
United States |
What this map layer shows:
The geology of the bedrock that lies at or near the land surface, but
not the surface materials like soils or glacial deposits. |
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Background Information |
Sample Map
A geologic map uses a combination of lines, symbols, and colors to show
the composition and structure of earth materials and their distribution
across and beneath the Earth's surface. Several map layers are used to
comprise the Generalized Geologic Map of the United States, including
geology and faults. For the conterminous United States the map layers
also include major calderas, impact structures, and the limits of continental
glaciation. This kind of general geologic information is used to find
natural resources such as water, minerals, oil, and gas; evaluate potential
hazards such as earthquakes, landslides, floods, and volcanic eruptions;
and to describe a fundamental part of the environment that controls the
distribution of plants and animals. These map layers were compiled by
the U.S. Geological
Survey (USGS).
The Generalized Geologic Map of the United States map layers show the
geology of the bedrock that lies at or near the land surface, but not
the distribution of surficial materials such as soils, alluvium, and
glacial deposits. Descriptive information includes rock and deposit
types, fault types, impact structure types, and the time period associated
with the glacial limit. Further information on general geology is available
from the USGS Geology
Discipline home page, and information on geologic
mapping is available from the USGS National
Cooperative Geologic Mapping Program, Maps
and Mapping page. |
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