Geologic maps and cross sections showing configurations of bedrock surfaces, Broken Bow 1x2 degree quadrangle, east-central Nebraska

Metadata also available as

Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator: V.L. Souders, retired
Publication_Date: 2000
Title:
Geologic maps and cross sections showing configurations of bedrock surfaces, Broken Bow 1x2 degree quadrangle, east-central Nebraska
Edition: 1.0
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: Geologic Investigations Series
Issue_Identification: I-2725
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey
Online_Linkage: <http://greenwood.cr.usgs.gov/pub/i-maps/i-2725/>

Description:
Abstract:
Sod-stabilized sand hills cover the northwest and north parts of the Broken Bow 1x2 degree quadrangle, east-central Nebraska. Southeast of these hills stretches a broad belt of loess-mantled tablelands and hills; the loess hills form a northeast-trending belt across the region, which is the dominant element in the landscape of the quadrangle. Some of the thickest loess deposits of North America occur here. In the southeast corner of the quadrangle is the 20- to 25-mi-wide valley of the Loup River-Platte River system. The Platte valley has a broad floodplain and broad Holocene terraces, whereas in the Loup River system floodplain and Holocene terraces are narrow but there is a broad Wisconsin-age terrace. Both rivers, having made their big bends, flow northeastward parallel to each other at the margins of this wide valley. The Loup River is more deeply entrenched than the Platte, which has a steeper gradient above its junction with the Loup east of the quadrangle.

Purpose:
To update earlier geologic mapping, and to provide sufficient geologic information for land-use decisions.

Supplemental_Information:
Compilation scale: 1:250,000 Geology mapped in 1987 to 1998. 

DATASETS INCLUDED IN THIS GEOSPATIAL DATABASE:
  bedrock: bedrock outcrop polygons
  geology: geologic contacts and polygons, and map neatline
  points: point features--test holes, volcanic ash beds, and Cotesfield
paleodivide query 
  struc: structure contour drawn on top of bedrock; contour interval 50 ft
  xsec_div: lines of cross sections A-AÕ, B-BÕ, and C-CÕ, and Cotesfield
paleodivide

Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2000
Currentness_Reference: publication date

Status:
Progress: Complete
Maintenance_and_Update_Frequency:
Irregular. Mapping is continuing in the region and a more complete map of this area may eventually be produced.

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -98.00
East_Bounding_Coordinate: -100.00
North_Bounding_Coordinate: 42.00
South_Bounding_Coordinate: 41.00

Keywords:
Theme:
Theme_Keyword_Thesaurus: AGI Glossary of Geology
Theme_Keyword: Geologic map
Theme_Keyword: loess
Theme_Keyword: Ogallala Group
Theme_Keyword: Arikaree Group
Theme_Keyword: White River Group
Theme_Keyword: Pierre Shale
Theme_Keyword: Niobrara Formation
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: USA
Place_Keyword: Nebraska
Place_Keyword: Broken Bow

Access_Constraints: none
Use_Constraints:
none. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.

Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Robert F. Diffendal
Contact_Organization: University of Nebraska, Lincoln
Contact_Address:
Address_Type: mailing address
Address: 113 NH
City: Lincoln
State_or_Province: NE
Postal_Code: 68588-0517
Contact_Voice_Telephone: 402-472-3471
Contact_Electronic_Mail_Address: rdiffendal1@unl.edu

Browse_Graphic:
Browse_Graphic_File_Name:
<http://greenwood.cr.usgs.gov/pub/i-maps/i-2725/i-2725.pdf>
Browse_Graphic_File_Description: graphic representation of map layout
Browse_Graphic_File_Type: PDF
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Data were checked by the geologist that made the field observations. This map has been thoroughly reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature.

Logical_Consistency_Report:
Map elements were visually checked for overshoots, undershoots, duplicate features, polygon closure, and other errors by the author and by the GIS technician(s) that created the digital database. Automated (ArcInfo) routines were also used to check the databases for polygon label errors, line or point attribution errors, sliver polygons, dangling arcs, intersection errors, and projection information.

Completeness_Report:
Data are complete. All geospatial database elements are attributed.

Lineage:
Process_Step:
Process_Description:
Polygons, lines, and points representing geologic features and data points were digitized from scale-stable compilation materials using ARC/INFO by True North Mapping.
Process_Date: 2000
Process_Step:
Process_Description:
The database files, metadata, and check plots were edited by the USGS Central Publications Group, and revisions made to the geospatial database as needed.
Process_Date: 2001
Process_Step:
Process_Description:
Final preparation of the geospatial database for distribution, and preparation of map-on-demand files and metadata.
Process_Date: 2001
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Universal_Transverse_Mercator:
UTM_Zone_Number: 14
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 1
Longitude_of_Central_Meridian: -99.0
Latitude_of_Projection_Origin: 41.0
False_Easting: 0.0
False_Northing: 0.0
Grid_Coordinate_System_Name: Universal Transverse Mercator
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 1
Ordinate_Resolution: 1
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview: 

---------------------------------------------------------------
COVERAGE NAME: bedrock
---------------------------------------------------------------

USER-DEFINED ITEMS IN BEDROCK.PAT:
------------------------------------

ATTRIBUTE NAME: TYPE
DATABASE ITEM STRUCTURE: 30,30,C
DESCRIPTION: nature of polygon
ITEM VALUES FOR 'TYPE':
BEDROCK OUTCROP

---------------------------------------------------------------
COVERAGE NAME: geology
---------------------------------------------------------------

USER-DEFINED ITEMS IN GEOLOGY.AAT:
------------------------------------

ATTRIBUTE NAME: TYPE_L
DATABASE ITEM STRUCTURE: 20,20,C
DESCRIPTION: nature of linear feature
ITEM VALUES FOR 'TYPE_L':
CONTACT
NEATLINE

------------------------------------
USER-DEFINED ITEMS IN GEOLOGY.PAT:
------------------------------------

ATTRIBUTE NAME: UNIT
DATABASE ITEM STRUCTURE: 8,8,C
DESCRIPTION: geologic map unit label
ITEM VALUES FOR 'UNIT':
Kn
Kp
To/Th

---------------------------------------------------------------
COVERAGE NAME: points
---------------------------------------------------------------

USER-DEFINED ITEMS IN POINTS.PAT:
------------------------------------

ATTRIBUTE NAME: TYPE
DATABASE ITEM STRUCTURE: 35,35,C
DESCRIPTION: nature of point symbol
ITEM VALUES FOR 'TYPE':
COTESFIELD PALEODIVIDE UNCERTAIN
TEST HOLE
VOLCANIC ASH BED
VOLCANIC ASH BED - COVERED
VOLCANIC ASH BED - OGALLALA
VOLCANIC ASH BED -OGALLALA -COVERED

---------------------------------------------------------------
COVERAGE NAME: struc
---------------------------------------------------------------

USER-DEFINED ITEMS IN STRUC.AAT:
------------------------------------

ATTRIBUTE NAME: ELEV
DATABASE ITEM STRUCTURE: 4,4,I
DESCRIPTION: elevation in feet of structure contour line
ITEM VALUES FOR 'ELEV':
1400
1500 through 2550 in 50-foot increments

---------------------------------------------------------------
COVERAGE NAME: xsec_div
---------------------------------------------------------------

USER-DEFINED ITEMS IN XSEC_DIV.AAT:
------------------------------------

ATTRIBUTE NAME: TYPE
DATABASE ITEM STRUCTURE: 30,30,C
DESCRIPTION: nature of linear feature
ITEM VALUES FOR 'TYPE':
COTESFIELD PALEODIVIDE
LINE OF CROSS SECTION A - AÕ
LINE OF CROSS SECTION B - BÕ
LINE OF CROSS SECTION C - CÕ
---------------------------------------------------------------
Entity_and_Attribute_Detail_Citation: none
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: Central Publications Group
Address: MS 902, Box 25046, DFC
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Contact_Voice_Telephone: 303-236-5486
Contact_Electronic_Mail_Address: webmaster@greenwood.cr.usgs.gov
Resource_Description: I-2725
Distribution_Liability:
Although this digital spatial data has been subjected to rigorous review and is substantially complete, it is released on the condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE, SHP
Format_Version_Number: ArcInfo version 8.0.2
File_Decompression_Technique:
.tar.gz - UNIX gzip-compressed TAR file - use GNU zip and TAR .ZIP - Windows ZIP archive - use Winzip, PKZip, or similar program to extract
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<http://greenwood.cr.usgs.gov/pub/i-maps/i-2725/>
Fees: none
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S.Geological Survey
Contact_Address:
Address_Type: mailing address
Address: USGS Information Services
Address: Box 25286
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: United States
Contact_Voice_Telephone: 1-888-ASK-USGS
Resource_Description: I-2725
Distribution_Liability: none
Standard_Order_Process:
Non-digital_Form: Available as one printed sheet and 11-page pamphlet.
Metadata_Reference_Information:
Metadata_Date: 20010308
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Alex Donatich
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: U.S. Geological Survey
Address: MS 902, Box 25046 DFC
City: Lakewood
State_or_Province: CO
Postal_Code: 80225-0046
Contact_Voice_Telephone: 303-236-5468
Metadata_Standard_Name:
FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

Generated by mp version 2.7.2 on Thu Mar 08 15:18:36 2001