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Geologic Units (Polygons): Geology of the Conterminous United States, 2005

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Abstract/Contents

Abstract
This polygon shapefile shows the boundaries of geologic units within the United States. This layer is part of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii. These 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. This is a revised version of the April 2004 data set. This map complements the Generalized Geologic Map of Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands by Reed and Bush. A geographic information system (GIS) allows combining and overlaying of layers for analysis of spatial relations not readily apparent in the standard paper publication. This layer is part of the 1997-2014 edition of the National Atlas of the United States.
Purpose
Conversion of the geologic map of the U.S. to a digital format was undertaken to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, whereas a paper map has a fixed scale and projection. However, these data are not intended to be used at any scale finer than 1:2,500,000.

Description

Type of resource cartographic, software, multimedia
Form Shapefile
Extent 3.233
Place Reston, Virginia, US
Publisher Geological Survey (U.S.)
Date valid 2005
Publication date 2005
Edition 1.2
Language English
Digital origin born digital
Map data 1:2500000Scale not given. ; EPSG::4269 W 124°43ʹ59ʺ--W 66°57ʹ16ʺ/N 49°23ʹ8ʺ--N 24°31ʹ4ʺ, Scale not given ; EPSG::4326

Creators/Contributors

Creator King, Philip B.
Creator Arndt, Raymond E.
Creator Schruben, Paul G.
Creator Bawiec, Walter J.
Creator Beikman, Helen M.

Subjects

Subject Faults (Geology)
Subject Folds (Geology)
Subject Shields (Geology)
Subject Plate tectonics
Subject Geology
Subject Alabama
Subject Arizona
Subject Arkansas
Subject Colorado
Subject Connecticut
Subject Delaware
Subject Florida
Subject Georgia
Subject Idaho
Subject Illinois
Subject Indiana
Subject Iowa
Subject Kansas
Subject Kentucky
Subject Louisiana
Subject Maine
Subject Maryland
Subject Massachusetts
Subject Michigan
Subject Minnesota
Subject Mississippi
Subject Missouri
Subject Montana
Subject Nebraska
Subject Nevada
Subject New Hampshire
Subject New Jersey
Subject New Mexico
Subject New York (State)
Subject North Carolina
Subject North Dakota
Subject Ohio
Subject Oklahoma
Subject Oregon
Subject Pennsylvania
Subject Rhode Island
Subject Rocky Mountains
Subject South Carolina
Subject South Dakota
Subject Tennessee
Subject Texas
Subject Utah
Subject Vermont
Subject Virginia
Subject Washington (D.C.)
Subject Washington (State)
Subject West Virginia
Subject Wisconsin
Subject Wyoming
Subject United States
Subject 1994
Subject 1974
Subject Geoscientific Information
Genre Geospatial data
Genre Cartographic dataset

Bibliographic information

WGS84 Cartographics This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
Location https://purl.stanford.edu/hv829rm6225

Access conditions

Use and reproduction
This item is in the public domain. There are no restrictions on use.
Copyright
This work is in the Public Domain, meaning that it is not subject to copyright.

Preferred citation

National Atlas of the United States. (2005). Geologic Units (Polygons): Geology of the Conterminous United States, 2005. National Atlas of the United States. Available at: http://purl.stanford.edu/hv829rm6225.

Collection

National atlas of the United States of America, 1997-2014

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