Boundaries and Tags for Major Geologic Units in the United States
Entry ID: UTC_majorgeologicunits

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Summary
Abstract: This data set contains boundaries and tags for major geologic units in the
conterminous United States. In addition to the polygons representing the areal
extent of geologic units, it identifies boundaries of metamorphic provinces,
major faults, calderas, impact structures, and the limits of continental
glaciation. The data depict 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. The data are generalized from a
compilation prepared for use in the Geologic Map of North America, to be
published in hard copy by the Geological Society of America and released as a
digital file by the U.S. Geological Survey. These data have been prepared with
a degree of detail appropriate for viewing at a scale of 1:7,500,000. Because
of the degree of generalization required (generalization based on compilation
scale), the data are intended primarily for display and for regional and
national analysis, rather than for more detailed analysis in specific areas. No
responsibility is assumed by the U.S. Geological Survey in the use of these
data.

Related URL
Link: GET DATA
Description: Location from which the map may be downloaded in PDF or archives
of ArcInfo files.


Geographic Coverage
 N: 44.773125 S: 30.833223  E: -72.71876  W: -122.21224

Data Set Citation
Dataset Originator/Creator: John C. Reed, Jr.,Charles A. Bush
Dataset Title: Boundaries and Tags for Major Geologic Units in the United States
Dataset Release Date: 2001
Dataset Release Place: Denver, Colorado
Dataset Publisher: U.S. Geological Survey
Data Presentation Form: map
Online Resource: http://pubs.usgs.gov/atlas/geologic/


Temporal Coverage
Start Date: 1998-03-01
Stop Date: 1999-06-01


Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA


Science Keywords
PALEOCLIMATE >ICE CORE RECORDS >VOLCANIC DEPOSITS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >BEDROCK LITHOLOGY    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >IGNEOUS ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >METAMORPHIC ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >SEDIMENTARY ROCKS    [Definition]
SOLID EARTH >TECTONICS >PLATE TECTONICS >FAULT MOVEMENT    [Definition]
SOLID EARTH >TECTONICS >VOLCANIC ACTIVITY    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
GEOSCIENTIFIC INFORMATION


Quality
The line attributes were manually checked by assigning unique line types to the
values and then plotting the data. The plots were then compared to the source.

The polygon attributes were checked by visually comparing the final colored
plots to maps at various larger scales. Polygon and node topology are present.
All polygons are labeled and were tested by using the Arc/INFO command
LABELERRORS. All polygons were checked for closure, node errors, overshoots,
undershoots, dangles and intersections using Arc/INFO routines. The Arc/INFO
commands BUILD and CLEAN were run to ensure the topological consistency of the
data set. This data set contains map unit boundaries and codes for the 48
conterminous States. Boundaries and codes are included for geologic units,
metamorphic facies, limits of glacial advance, impact structures, caldera
boundaries, and major faults.


Access Constraints
None


Use Constraints
None. Acknowledgment of the National Atlas of the United States of America and
(or) the U.S. Geological Survey would be appreciated in products derived from
these data.


Keywords
bedrock
faults
geologic history
geologic map
geology
glacial limits
impact structures
metamorphic rocks
plutonic rocks
regional geology
sedimentary rocks
tectonic history
tectonics
volcanics


Data Set Progress
COMPLETE


Data Center
Central Region, Publications, Geology Division, U.S. Geological Survey, U.S. Department of the Interior    [Information]
Data Center URL: http://cpg.cr.usgs.gov/pub/publications.html

Data Center Personnel
Name: GENE ELLIS
Phone: 303-236-0953
Fax: 303-236-5349
Email: gellis at usgs.gov
Contact Address:
US Geological Survey
Geologic Division, Central Region
Box 25046, Mail Stop 980
City: Denver
Province or State: CO
Postal Code: 80225-0046
Country: USA



Distribution
Distribution_Media: Online
Fees: No fees


Personnel
TYLER B. STEVENS
Role: DIF AUTHOR
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


JOHN C. REED
Role: TECHNICAL CONTACT
Phone: 303-236-1276
Fax: 303-236-0214
Email: reed at usgs.gov
Contact Address:
Mail Stop 913
Box 25046
City: Lakewood
Province or State: Colorado
Postal Code: 80225
Country: USA



Creation and Review Dates
DIF Creation Date: 2003-03-26
Last DIF Revision Date: 2012-12-21
Future DIF Review Date: 2004-03-26

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