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Surficial Geologic map of the Greater Omaha Area, Nebraska and Iowa
Entry ID: USGS_Map-MF-2391


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Summary
Abstract: This map provides geologic information for land-use decisions.

Geologic mapping, in support of the USGS Omaha-Kansas City Geologic Mapping
Project, shows the spatial distribution of artificial-fill, alluvial, eolian,
and glacial deposits and bedrock in and near Omaha, Nebraska. Artificial fill
deposits are mapped chiefly beneath commercial structures, segments of
interstate highways and other major highways, railroad tracks, airport runways,
and military facilities, and in landfills and earth fills. Alluvial deposits
are mapped beneath flood plains, in stream terraces, and on hill slopes. They
include flood-plain and stream-channel alluvium, sheetwash alluvium, and
undivided sheetwash alluvium and stream alluvium. Wind-deposited loess forms
sheets that mantle inter-stream areas and late Wisconsin terrace alluvium.
Peoria Loess is younger of the two loess sheets and covers much of the
inter-stream area in the map area. Loveland Loess is older and is exposed in a
few small areas in the eastern part of the map area. Glacial deposits are
chiefly heterogeneous, ice-deposited, clayey material (till) and minor
interstratified stream-deposited sand and gravel. Except for small outcrops,
glacial deposits are covered by eolian and alluvial deposits throughout most of
the map area. Bedrock is locally exposed in natural exposures along the major
streams and in quarries. It consists of Dakota Sandstone and chiefly limestone
and shale of the Lansing and Kansas City Groups. Sand and gravel in flood plain
and stream-channel alluvium in the Platte River valley are used mainly for
concrete aggregate. Limestone of the Lansing and Kansas City Groups is used for
road-surfacing material, rip rap, and fill material.

Surficial deposits are mapped where they are estimated to be at least 1 m
thick. Most of the surficial deposits are poorly exposed. The surficial
deposits were locally observed in foundation excavations, road cuts, and other
exposures in 1995 and 1996. Thin, discontinuous sheetwash alluvium (Qsw) and
small artificial-fill deposits (af) were not mapped. Small outcrops of
Loveland Loess, till, Dakota Sandstone, and limestone outcrops of the Lansing
and Kansas City Groups that are too small to map are shown as symbols. Mapping
in and near Omaha is modified from that of Miller (1964, plates 2 and 3 at
1:24,000 scale). Mapping in the rest of the map area is based primarily on
interpretation of 1:15,840- and 1:20,000-scale county soil maps (Bartlett,
1975; Borchers and others, 1984; Branham, 1989; Nixon, 1982) and interpretation
of aerial photography, supplemented by examination of artificial and natural
exposures. The aerial photography includes: 1:40,000-scale, black-and-white,
aerial photographs taken in April and May 1990 and in March and April 1993, and
also 1:60,000-scale, color infrared, aerial photographs taken in May 1981 and
April 1982. Age assignments for surficial deposits are based in part on soil
development. Soil-horizon designations and textural terms, such as silt loam
and clay loam, are those of the Soil Survey Staff (1975). Grain-size ranges
given for surficial deposits are estimates that are based on the modified
Wentworth scale (American Geological Institute, 1982). Dry matrix colors of the
surficial deposits were determined by comparison with Munsell Soil Color Charts
(Munsell Color, 1973). In general, colors of the surficial deposits are
similar to those of the bedrock and other materials from which the deposits
were derived. Unweathered to slightly weathered surficial deposits observed in
the map area commonly range from gray (5Y 6/1) to very pale brown (10YR 8/4).
In this report, the terms "alluvium" and "alluvial" refer to surficial
material transported by running water confined to channels (stream alluvium) as
well as material transported by running water not confined to channels
(sheetwash alluvium). The term "colluvial" here refers to surficial material
transported down slopes chiefly by mass-movement (gravity-driven) processes,
such as creep. All of the radiocarbon and thermoluminescence ages in this
report are uncalibrated. The thickness and grain-size ranges of surficial map
units are based chiefly on interpretation of approximately 300 unpublished
drill-hole logs and approximately 30 water-well logs on file with the
Conservation and Survey Division, University of Nebraska-Lincoln, and test-hole
data summarized by Burchett (1965) and Burchett and Smith (1989a, 1989b).
Metric units are used in this report. (See text for complete bibliographic
references.)

Coverages included in this geospatial database:
>ompnt100 coverage: Contains geologic points for sites classified as bedrock,
Loveland Loess, or Till.

>ombdy100 coverage: Contains lines defining state and county boundaries
derived from USGS DLG data.

>omtrn100 coverage: Contains lines defining linear transportation
features (highways and roads) derived from USGS DLG data.

>omhyp100 coverage: Contains lines defining hypsographic features derived from
USGS DLG data.

>omhyd100 coverage: Contains polygons and lines defining hydrographic features
derived from USGS DLG data.

>ommea100 coverage: Contains lines defining scarps bordering former channels
of the Missouri River.

Related URL
Link: GET DATA
Description: Map PDF file (8.7 MB)


Link: GET DATA
Description: Text-only Map PDF file (236 KB)
(This version of the report is accessible as defined in Section 508.)


Link: GET DATA
Description: Archived GIS files (not Section 508 accessible):
TARRED and GZIPPED ArcInfo files, metadata, etc. (19 MB)


Link: GET DATA
Description: Archived GIS files (not Section 508 accessible):
ZIPPED ArcInfo files, metadata, etc. (15 MB)


Link: VIEW EXTENDED METADATA


Link: VIEW PROJECT HOME PAGE
Description: Digital GIS data, metadata, and PDF files of map may be downloaded from this
URL.


Geographic Coverage
 N: 41.375 S: 41.0  E: -95.875  W: -96.25

Data Set Citation
Dataset Originator/Creator: Ralph R. Shroba; Theodore R. Brandt; Jeffrey C. Blossom
Dataset Title: Surficial Geologic map of the Greater Omaha Area, Nebraska and Iowa
Dataset Series Name: U.S. Geological Survey Miscellaneous Field Studies Map
Dataset Release Date: 2001
Dataset Release Place: Denver, CO, USA
Dataset Publisher: U.S. Geological Survey
Version: 1.0
Issue Identification: MF-2391
Data Presentation Form: Map
Online Resource: http://pubs.usgs.gov/mf/2001/mf-2391/


Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > IOWA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEBRASKA > OMAHA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEBRASKA


Science Keywords
HUMAN DIMENSIONS >BOUNDARIES >ADMINISTRATIVE DIVISIONS    [Definition]
HUMAN DIMENSIONS >BOUNDARIES >POLITICAL DIVISIONS    [Definition]
HUMAN DIMENSIONS >INFRASTRUCTURE >BUILDINGS    [Definition]
HUMAN DIMENSIONS >INFRASTRUCTURE >TRANSPORTATION    [Definition]
HUMAN DIMENSIONS >ENVIRONMENTAL GOVERNANCE/MANAGEMENT >LAND MANAGEMENT >LAND USE/LAND COVER CLASSIFICATION    [Definition]
TERRESTRIAL HYDROSPHERE >SURFACE WATER >HYDROPATTERN    [Definition]
TERRESTRIAL HYDROSPHERE >SURFACE WATER >RIVERS/STREAMS    [Definition]
LAND SURFACE >EROSION/SEDIMENTATION >SEDIMENTS    [Definition]
LAND SURFACE >EROSION/SEDIMENTATION >STRATIGRAPHIC SEQUENCE    [Definition]
LAND SURFACE >GEOMORPHOLOGY >EOLIAN LANDFORMS/PROCESSES    [Definition]
LAND SURFACE >GEOMORPHOLOGY >FLUVIAL LANDFORMS/PROCESSES    [Definition]
LAND SURFACE >GEOMORPHOLOGY >GLACIAL LANDFORMS/PROCESSES    [Definition]
LAND SURFACE >SOILS    [Definition]
LAND SURFACE >TOPOGRAPHY >CONTOURS    [Definition]
LAND SURFACE >TOPOGRAPHY >LANDFORMS    [Definition]
SOLID EARTH >GEOMORPHIC LANDFORMS/PROCESSES >AEOLIAN LANDFORMS    [Definition]
SOLID EARTH >GEOMORPHIC LANDFORMS/PROCESSES >FLUVIAL LANDFORMS    [Definition]
SOLID EARTH >GEOMORPHIC LANDFORMS/PROCESSES >GLACIAL LANDFORMS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >SEDIMENTARY ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >SEDIMENTS    [Definition]


ISO Topic Category
BOUNDARIES
ELEVATION


Platform
MAPS    [Information]


Access Constraints
None


Use Constraints
None.

Acknowledgment of the U.S. Geological Survey would be appreciated in products
derived from these data. Although software enables the user to display images
at various scales, map data in this report should not be used at scales greater
than 1:100,000.


Keywords
geologic maps
surficial deposits
surficial geology
surficial geologic maps
geology
Peoria Loess
Loveland Loess
glacial deposits
till
artificial-fill deposits
Dakota Sandstone
Kansas City Group
Lansing Group
alluvial deposits
Missouri River
Platte River
Douglas County
Sarpy County
Cass County
Pottawattamie County
Mills County
CONSERVATION


Data Set Progress
COMPLETE


Originating Center
USGS


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
Dataset ID: USGS Miscellaneous Field Studies Map MF-2391

Data Center Personnel
Name: U.S. GEOLOGICAL SURVEY CENTRAL PUBLICATIONS GROUP
Phone: (303) 236-5486
Contact Address:
Denver Federal Center
MS-902
Box 25046
City: Denver
Province or State: CO
Postal Code: 80225-0046
Country: USA



Distribution
Distribution_Media: Online (HTTP)
Distribution_Size: 90 MB
Distribution_Format: ArcInfo Export
Fees: None

Distribution_Media: Online (HTTP)
Distribution_Size: 90 MB
Distribution_Format: Shapefile
Fees: None


Personnel
RALPH R. SHROBA
Role: DIF AUTHOR
Role: TECHNICAL CONTACT
Role: INVESTIGATOR
Phone: 303-236-1292
Fax: 303-236-0214
Email: rshroba at usgs.gov
Contact Address:
U.S. Geological Survey
Box 25046, MS 913
Denver Federal Center
City: Denver
Province or State: CO
Postal Code: 80225-0046
Country: USA



Creation and Review Dates
DIF Creation Date: 2003-03-03
Last DIF Revision Date: 2004-10-20
Future DIF Review Date: 2004-03-03


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