Surficial Geologic map of the Greater Omaha Area, Nebraska and Iowa

Online link https://geo-nsdi.er.usgs.gov/metadata/map-mf/2391/metadata.faq.html
Description 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 chi
Originators Shroba, Ralph R.; Brandt, Theodore R.; and Blossom, Jeffrey C.
Publication U.S. Geological Survey Miscellaneous Field Studies Map MF-2391

Related topics

States or counties

Overview of attributes

The data is supplied in ARC/INFO export format.
This GIS database includes related look-up tables, which store detailed attribute information.  Arc/Info relates for each coverage are saved in a file named <covername>.rel.  Use the RELATE command with the restore argument at the arc prompt to make the relates active.  Alternatively, in Arctools, use the Relate environment:  open dialog in the Manage - Relates flyout menu under the Arctools menu to make the relates active.
omgeo100 coverage:  Contains all contact lines and labelpoints for each geologic polygon. In the omgeo100.pat INFO file the UNIT item indicates the numeric code used to identify the rock unit, which is described in the omgeo100.ru look-up table. The SOURCE item provides a numeric code used to identify the data source for the rock unit. Complete references for the sources listed are listed in the omgeo100.ref file.  The LABEL item indicates the rock unit label (abbreviation) used to label unit on map.  The DESC item defines formal or informal unit name. The SYMBOL item refers to the shade symbol in shadeset wpgcmykg.shd used to fill the geology polygons with color.
In the coverage's omgeo100.aat INFO file the LINECODE item provides a numeric code used to identify type of linear feature. Linecodes < 100 are used for contacts and boundaries which are described in the omgeo100.con file.  The NAME item lists the name given to structural feature. The SOURCE item lists the numeric code used to identify the data source for the linear feature.  Complete references for the sources are listed in the omgeo100.ref file.
Related look-up table files are omgeo100.con, omgeo100.ru, and omgeo100.ref.  In the omgeo100.con INFO file, the LINECODE item indicates the numeric code (a value < 100) used to identify type of contact or boundary. This item relates directly to the LINECODE item in omgeo100.aat.  The SYMBOL item lists the line symbol number used by Arc/Info to plot the line (Symbol numbers refer to the geol_sfo.lin lineset).  The TYPE item lists the major type of line, e.g., contact, state boundaries, lines of latitude and longitude used for neatlines.  The MODIFIER item lists the line type modifier, i.e., approximate, concealed, or gradational. No entry implies 'known'.  The CERTAINTY item lists the degree of certainty of contact or boundary, i.e., inferred or uncertain.  No entry implies 'certain'.  The DESC item lists the written description or explanation of the contact or boundary.  In the omgeo100.ru INFO file, the UNIT item refers to the numeric code used to identify the rock unit.  The LABEL item refers to the rock unit label (abbreviation) used to label unit on map. The SYMBOL item indicates the shadeset symbol number used by Arc/Info to plot a filled/shaded polygon.  (The symbol numbers used in this file refer to the wpgcmykg.shd shadeset.)  The NAME item lists the prefix portion of the rock unit label that does not include subscripts.  (If subscripting is not used in the original unit label, then the 'name' entry is the same as the 'label' entry.)  The SS item lists the suffix portion of the rock unit label that includes subscripts.  The LITH item list the major type of lithostratigraphic unit, i.e., unconsolidated sediments, sedimentary rocks, metasedimentary rocks, intrusive rocks, extrusive rocks, metamorphic rocks, water, and ice.  The DESC item lists the formal or informal unit name.  The MINAGE item indicates the minimum stratigraphic age of the lithologic unit, i.e. CRET, TERT, PCY.  The MAXAGE item indicates the maximum stratigraphic age of the lithologic unit.  The MINDATE item indicates the minimum radiometric age (in millions of years) if determined.  The MAXDATE item indicates the maximum radiometric age (in millions of years) if determined.  In the omgeo100.ref INFO file, the SOURCE item lists the numeric code used to identify the data source.  The SCALE item lists the scale of the source map.  (This value is the denominator of the proportional fraction that identifies the scale of the map that was digitized or scanned to produce the digital map.)  The AUTHORS item lists the author(s) or compiler(s) of source map entered as last name, first name or initial, and middle initial.  The YEAR item lists the source (map) publication date.  The REFERENCE item lists the remainder of the reference in USGS reference format.
The database structure used for this dataset follows the data model used in Lewis and Derkey (1999; USGS Open-File Report 99-438), and includes some attributes that, in this data set, do not have values, for structural consistency with the data model. For a more thorough description of this data model, please see http://pubs.usgs.gov/of/1999/0438/
The INFO structure of these files is listed below:
>OMGEO100.PAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  AREA                   8    18     F      5
>    9  PERIMETER              8    18     F      5
>   17  OMGEO100#              4     5     B      -
>   21  OMGEO100-ID            4     5     B      -
>   25  UNIT                   4     4     I      -
>   29  SOURCE                 4     4     I      -
>   33  LABEL                 10    10     C      -
>   43  DESC                 100   100     C      -
>  143  SYMBOL                 3     3     I      -
>
>
>OMGEO100.AAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  FNODE#                 4     5     B      -
>    5  TNODE#                 4     5     B      -
>    9  LPOLY#                 4     5     B      -
>   13  RPOLY#                 4     5     B      -
>   17  LENGTH                 8    18     F      5
>   25  OMGEO100#              4     5     B      -
>   29  OMGEO100-ID            4     5     B      -
>   33  LINECODE               3     3     I      -
>   36  NAME                  30    30     C      -
>   66  SOURCE                 4     4     I      -
>
>
>OMGEO100.CON:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  LINECODE               3     3     I      -
>    4  SYMBOL                 3     3     I      -
>    7  TYPE                  10    10     C      -
>   17  MODIFIER              20    20     C      -
>   37  CERTAINTY             15    15     C      -
>   52  DESC                 100   100     C      -
>
>
>OMGEO100.RU:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  UNIT                   4     4     I      -
>    5  LABEL                 10    10     C      -
>   15  SYMBOL                 3     3     I      -
>   18  NAME                   7     7     C      -
>   25  SS                     3     3     C      -
>   28  LITH                  20    20     C      -
>   48  DESC                 250   250     C      -
>  298  MINAGE                 7     7     C      -
>  305  MAXAGE                 7     7     C      -
>OMGEO100.REF:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  SOURCE                 4     4     I      -
>    5  SCALE                  8     8     I      -
>   13  AUTHORS              200   200     C      -
>  213  YEAR                   4     4     I      -
>  217  REFERENCE            250   250     C      -
omter100 coverage:  Contains geologic polygons for areas of Peoria Loess.  These polygons are duplicates of ones found in omgeo100 for this unit and are used for cartographic purposes in overprinting pattern in these areas.
The INFO structure of these files is listed below:
>OMTER100.PAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  AREA                   8    18     F      5
>    9  PERIMETER              8    18     F      5
>   17  OMTER100#              4     5     B      -
>   21  OMTER100-ID            4     5     B      -
>   25  UNIT                   4     4     I      -
>   29  SOURCE                 4     4     I      -
>   33  LABEL                 10    10     C      -
>   43  DESC                 100   100     C      -
>
>
>OMTER100.AAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  FNODE#                 4     5     B      -
>    5  TNODE#                 4     5     B      -
>    9  LPOLY#                 4     5     B      -
>   13  RPOLY#                 4     5     B      -
>   17  LENGTH                 8    18     F      5
>   25  OMTER100#              4     5     B      -
>   29  OMTER100-ID            4     5     B      -
>   33  LINECODE               3     3     I      -
>   36  NAME                  30    30     C      -
>   66  SOURCE                 4     4     I      -
>
>
>OMTER100.CON:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  LINECODE               3     3     I      -
>    4  SYMBOL                 3     3     I      -
>    7  TYPE                  10    10     C      -
>   17  MODIFIER              20    20     C      -
>   37  CERTAINTY             15    15     C      -
>   52  DESC                 100   100     C      -
>
>
>OMTER100.REF:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  SOURCE                 4     4     I      -
>    5  SCALE                  8     8     I      -
>   13  AUTHORS              200   200     C      -
>  213  YEAR                   4     4     I      -
>  217  REFERENCE            250   250     C      -
ompnt100 coverage:  Contains geologic points for sites classified as bedrock, Loveland Loess, or Till.
The INFO structure of these files is listed below:
>OMPNT100.PAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  AREA                   8    18     F      5
>    9  PERIMETER              8    18     F      5
>   17  OMPNT100#              4     5     B      -
>   21  OMPNT100-ID            4     5     B      -
>   25  PTTYPE                32    32     C      -
>   57  SYMBOL                 3     3     I      -
>   60  SOURCE                 4     4     I      -
>
>
>OMPNT100.REF:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  SOURCE                 4     4     I      -
>    5  SCALE                  8     8     I      -
>   13  AUTHORS              200   200     C      -
>  213  YEAR                   4     4     I      -
>  217  REFERENCE            250   250     C      -
ombdy100 coverage:  Contains lines defining state and county boundaries derived from USGS DLG data.
The INFO structure of these files is listed below:
>OMBDY100.AAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  FNODE#                 4     5     B      -
>    5  TNODE#                 4     5     B      -
>    9  LPOLY#                 4     5     B      -
>   13  RPOLY#                 4     5     B      -
>   17  LENGTH                 8    18     F      5
>   25  OMBDY100#              4     5     B      -
>   29  OMBDY100-ID            4     5     B      -
>   33  LINECODE               3     3     I      -
>   36  NAME                  30    30     C      -
>   66  SOURCE                 4     4     I      -
>
>
>OMBDY100.CON:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  LINECODE               3     3     I      -
>    4  SYMBOL                 3     3     I      -
>    7  TYPE                  10    10     C      -
>   17  MODIFIER              20    20     C      -
>   37  CERTAINTY             15    15     C      -
>   52  DESC                 100   100     C      -
>
>
>OMBDY100.REF:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  SOURCE                 4     4     I      -
>    5  SCALE                  8     8     I      -
>   13  AUTHORS              200   200     C      -
>  213  YEAR                   4     4     I      -
>  217  REFERENCE            250   250     C      -
omtrn100 coverage:  Contains lines defining linear transportation features (highways and roads) derived from USGS DLG data.
The INFO structure of these files is listed below:
>OMTRN100.AAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  FNODE#                 4     5     B      -
>    5  TNODE#                 4     5     B      -
>    9  LPOLY#                 4     5     B      -
>   13  RPOLY#                 4     5     B      -
>   17  LENGTH                 8    18     F      5
>   25  OMTRN100#              4     5     B      -
>   29  OMTRN100-ID            4     5     B      -
>   33  ENTITY_LABEL           7     7     C      -
>   40  ROUTE_NUMBER1          7     7     C      -
>
>
>OMTRN100.REF:
>
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  SOURCE                 4     4     I      -
>    5  SCALE                  8     8     I      -
>   13  AUTHORS              200   200     C      -
>  213  YEAR                   4     4     I      -
>  217  REFERENCE            250   250     C      -
omhyp100 coverage:  Contains lines defining hypsographic features derived from USGS DLG data.  The ELEVATION_M item stores the 20 meter contour elevation data.  The ENTITY_ LABEL item stores the DLG major/minor 0200200 code common to all arcs in the dataset, which identifies the type of hypsographic data.
The INFO structure of these files is listed below:
>OMHYP100.AAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  FNODE#                 4     5     B      -
>    5  TNODE#                 4     5     B      -
>    9  LPOLY#                 4     5     B      -
>   13  RPOLY#                 4     5     B      -
>   17  LENGTH                 8    18     F      5
>   25  OMHYP100#              4     5     B      -
>   29  OMHYP100-ID            4     5     B      -
>   33  ENTITY_LABEL           7     7     C      -
>   40  ELEVATION_M            8    12     F      3
>
>
>OMHYP100.REF:
>
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  SOURCE                 4     4     I      -
>    5  SCALE                  8     8     I      -
>   13  AUTHORS              200   200     C      -
>  213  YEAR                   4     4     I      -
>  217  REFERENCE            250   250     C      -
omhyd100 coverage:  Contains polygons and lines defining hydrographic features derived from USGS DLG data.  The ENTITY_LABEL item defines major streams/rivers/lakes (polygons) as open water fill areas when coded 0500200.
The INFO structure of these files is listed below:
>OMHYD100.PAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  AREA                   8    18     F      5
>    9  PERIMETER              8    18     F      5
>   17  OMHYD100#              4     5     B      -
>   21  OMHYD100-ID            4     5     B      -
>   25  ENTITY_LABEL           7     7     C      -
>   32  SOURCE                 4     4     I      -
>
>
>OMHYD100.AAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  FNODE#                 4     5     B      -
>    5  TNODE#                 4     5     B      -
>    9  LPOLY#                 4     5     B      -
>   13  RPOLY#                 4     5     B      -
>   17  LENGTH                 8    18     F      5
>   25  OMHYD100#              4     5     B      -
>   29  OMHYD100-ID            4     5     B      -
>   33  SOURCE                 4     4     I      -
>
>
>OMHYD100.REF:
>
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  SOURCE                 4     4     I      -
>    5  SCALE                  8     8     I      -
>   13  AUTHORS              200   200     C      -
>  213  YEAR                   4     4     I      -
>  217  REFERENCE            250   250     C      -
ommea100 coverage:  Contains lines defining scarps bordering former channels of the Missouri River.  Hatchures point downslope.
The INFO structure of these files is listed below:
>OMMEA100.AAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  FNODE#                 4     5     B      -
>    5  TNODE#                 4     5     B      -
>    9  LPOLY#                 4     5     B      -
>   13  RPOLY#                 4     5     B      -
>   17  LENGTH                 4    12     F      3
>   21  OMMEA100#              4     5     B      -
>   25  OMMEA100-ID            4     5     B      -
>   29  LINECODE               3     3     I      -
>   32  NAME                  30    30     C      -
>   62  SOURCE                 4     4     I      -
>
>
>OMMEA100.STR:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  LINECODE               3     3     I      -
>    4  SYMBOL                 3     3     I      -
>    7  TYPE                  10    10     C      -
>   17  HORIZONTAL            20    20     C      -
>   37  VERTICAL              20    20     C      -
>   57  FOLD                  15    15     C      -
>   72  PLUNGE                15    15     C      -
>   87  ACCURACY              15    15     C      -
>  102  CERTAINTY             15    15     C      -
>  117  DESC                 100   100     C      -
>
>
>OMMEA100.REF:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  SOURCE                 4     4     I      -
>    5  SCALE                  8     8     I      -
>   13  AUTHORS              200   200     C      -
>  213  YEAR                   4     4     I      -
>  217  REFERENCE            250   250     C      -
Auxiliary files:
geol_sfo.lin:  This lineset file defines geologic line types in the geologically themed coverages.
geoscamp2.mrk:  This markerset file defines the geologic markers in the geologically themed coverages. To use this markerset, fnt037 must be in the user's directory.
wpgcmykg.shd:  This shadeset file defines the cmyk values of colors assigned to polygons in the geologically themed coverages.
omgeo100.pdf:  A file for viewing and printing a graphics version of the map and accessory elements using Adobe Acrobat viewing software (version 4.0).
Coding of UNIT, LABEL, and DESC attributes in the omgeo100 coverage is                  listed below:
>UNIT  | LABEL | DESC
>1     | af    | Artificial fill deposits
>2     | Qal   | Flood plain and stream channel alluvium
>3     | Qsw   | Sheetwash alluvium
>4     | Qss   | Sheetwash and stream alluvium
>5     | Qlp   | Peoria Loess
>6     | Qll   | Loveland Loess
>7     | Qti   | Till
>8     | R     | Bedrock
>9     | w     | Open Water
Coding of ENTITY_LABEL attribute numbers in the omtrn100 coverage is listed below:
>Interstates
>1700201
>1700203
>Minor highways
>1700204
>1700205
>Main roads
>1700209
>Minor streets
>1700210
>1700211
>Main road on/off ramps
>1700402