1:500,000 Scale Geology for the Southwestern U.S.

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:
RS/GIS Laboratory, College of Natural Resources, Utah State University
Publication_Date: 20040917
Title: 1:500,000 Scale Geology for the Southwestern U.S.
Edition: version 1.0
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage: <http://earth.gis.usu.edu/swgap/>
Larger_Work_Citation:
Citation_Information:
Originator: USGS GAP Analysis Program
Publication_Date: Unpublished Material
Title:
Tentative title "Southwest Regional GAP Analysis Project Final Report."
Description:
Abstract:
This data set is a seamless 1:500,000 scale surficial geologic coverage for the states of Arizona, Colorado, Nevada, New Mexico and Utah. The coverage was compiled and edge matched from existing digital versions of the 1:500,000 scale state geologic maps (Green, 1992; Ramsey, 1996; Turner and Bawiec, 1996; Green and Jones, 1997; Hirschberg and Pitts, 2000). Similar geologic units were correlated only along state boundaries to facilitate edge matching. Correlation and merging of units along state boundaries was based on similar age and characteristics of units. Landsat TM images were geologically interpreted to facilitate accurate mapping and edge matching along state boundaries. Whenever possible existing state specific geologic detail was maintained. Soil substrate classification was derived from a 1:500,000 scale geologic coverage using a modified soil classification scheme developed by NatureServe.

Soil substrate codes and geology were correlated based of bulk rock chemical compositions and characteristics. Soil substrate codes are as follows: QYA = Quaternary age younger alluvium and surficial deposits, QOA = Quaternary age older alluvium and surficial deposits, EOS = Unconsolidated Aeolian sand deposits both active and stabilized, SND = Sandstone dominated formations of all ages, SLM = Siltstone and/or mudstone dominated formations of all ages, SHL = Shale dominated formations of all ages, CLM = Carbonate dominated formations either limestone or dolomites of all ages, EVP = Evaporite units either halite, gypsum, or other saline mineral dominated formations of all ages, GSL = Metamorphic or igneous units with a dominantly silicic composition all ages, BMC = Metamorphic or igneous units with dominantly mafic composition all ages, H20 = Water, and UNK= unable to assign a substrate type.

Purpose:
The geology GIS dataset may be used for various purposes with user's discretion. Formal validation of this dataset has not been conducted.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1992
Ending_Date: 1997
Currentness_Reference: publication date
Status:
Progress: complete
Maintenance_and_Update_Frequency: none planned
Spatial_Domain:
Description_of_Geographic_Extent: Southwestern United States.
Bounding_Coordinates:
West_Bounding_Coordinate: -120
East_Bounding_Coordinate: -101
North_Bounding_Coordinate: 42
South_Bounding_Coordinate: 30
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: geology
Theme_Keyword: substrate
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Southwest U.S.
Place_Keyword: Arizona
Place_Keyword: Colorado
Place_Keyword: New Mexico
Place_Keyword: Nevada
Place_Keyword: Utah
Access_Constraints: none
Use_Constraints: none
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Remote Sensing/GIS Laboratory, College of Natural Resources, Utah State University
Contact_Person: John Lowry
Contact_Address:
Address_Type: mailing
Address: UMC 5275
City: Logan
State_or_Province: Utah
Postal_Code: 84322-5275
Country: USA
Contact_Voice_Telephone: 435-797-0653
Data_Set_Credit:
Stefan Kirby, M.S. Candidate, Utah State University, Dept. of Geology, and Keith Pohs, USGS Southwest Biological Science Center, Colorado Plateau Field Station, Northern Arizona University

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
A formal assessment of the accuracy of this combined southwest geology dataset has not been conducted. Accuracy is assumed to be approximately the same as the 5 source datasets. See citations of original sources under Source Information, Source Citation of this metadata file.

All polygons should have a label for geologic formation (GEO_CODE). Where geologic formation codes differed across state boundaries, the originators' merging these datasets together had to decide which geologic formation code to keep. Thus, polygons that straddle state boundaries were labeled subject the originators' best professional judgement, available information associated with the source maps, and the interpretation of geologic formations from exiting Landsat TM imagery. Substrate codes were assigned to each geologic code with a look-up table appropriate for each state's geologic formation codes.

Logical_Consistency_Report:
The logical consistency of the input data layers from which this coverage was created was thoroughly reviewed, particularly at the juxtaposition of state boundaries where each state's geologic formation codes were cross-referenced and labeled according to the originators' best judgement. All polygons should be labeled with geologic formation and substrate codes. Some polygons were given an unknown substrate code (UNK) where there was not enough information available to assign a substrate type to a given geologic formation.
Completeness_Report:
All polygons should be labeled with a geologic formation code and a substrate code. Some polygons were given a unknown substrate code (UNK) indicating that the compilers did not feel they had enough information to assign a substrate type to a given geologic formation.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Green, G. N.
Publication_Date: 1992
Title: The Digital Geologic Map of Colorado in ArcInfo Format.
Geospatial_Data_Presentation_Form: vector digital data
Source_Scale_Denominator: 500,000
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1992
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: OF-92-0507, US Geological Survey, Denver, Colorado
Source_Contribution: Digital dataset for Colorado geology at 1:500k
Source_Information:
Source_Citation:
Citation_Information:
Originator: Green, G. N. and G.E. Jones
Publication_Date: 1997
Title:
The Digital Geologic Map of New Mexico 1:500,000 scale in ArcInfo Format
Geospatial_Data_Presentation_Form: vector digital data
Source_Scale_Denominator: 500,000
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1997
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: OF-97-0052, US Geological Survey, Denver, Colorado
Source_Contribution: Digital dataset for New Mexico geology at 1:500k
Source_Information:
Source_Citation:
Citation_Information:
Originator: Hirschberg, D.M. and S.G. Pitts
Publication_Date: 2000
Title:
Digital Geologic Map of Arizona: A Digital Database from the 1983 Printing of Wilson, Moore and Cooper, 1:500,000 scale map of Arizona.
Geospatial_Data_Presentation_Form: vector digital data
Source_Scale_Denominator: 500,000
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2000
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: OF-00-409, US Geological Survey, Denver, Colorado
Source_Contribution: Digital dataset for Arizona geology at 1:500k
Source_Information:
Source_Citation:
Citation_Information:
Originator: Ramsey, R.D.
Publication_Date: 1996
Title:
Digital Compilation of Geologic Map of Utah by L.F. Hintze, G.C. Willis, D.Y.M. Laes, D.A. Sprinkle and K.D. Brown.
Geospatial_Data_Presentation_Form: vector digital data
Source_Scale_Denominator: 500,000
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1992
Ending_Date: 1997
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: DDS 41, US Geologcial Survey, Denver, Colorado
Source_Contribution: Digital dataset for Colorado geology at 1:500k
Source_Information:
Source_Citation:
Citation_Information:
Originator: Truner, R.M. and W.J. Bawic
Publication_Date: 1996
Title: Digital Map of Nevada at scale of 1:500,000
Geospatial_Data_Presentation_Form: vector digital data
Source_Scale_Denominator: 500,000
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19996
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: DDS 41, US Geological Survey, Denver, Colorado
Source_Contribution: Digital dataset for Nevada geology at 1:500k
Process_Step:
Process_Description:
1) All 5 digital datasets were converted to ArcInfo coverages and attribute fields for geologic formation code were standardized. 2) All 5 digital datasets were APPENDed together in ArcInfo. 3) Using paper copy geologic maps in hand, and Landsat TM imagery as a backdrop, polygons straddling state boundaries were MERGED. When necessary polygon lines were re-shaped to make boundary polygons match. 4) When geologic codes differed across state boundaries, the originator (compiler) used best professional judgement and information associated with paper maps to dectermine appropriate geologic code. 5) Substrate codes were assigned to geologic codes using best professional judgement with a look-up table. 6) Dataset was quality controlled for unlabeled polygons and other possible errors.
Process_Date: 20030901

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: vector

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: albers conical equal area
Albers_Conical_Equal_Area:
Standard_Parallel: 29 30 0.000
Standard_Parallel: 45 30 0.000
Longitude_of_Central_Meridian: -96 0 0.000
Latitude_of_Projection_Origin: 23 0 0.000
False_Easting: 0
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 1.5
Ordinate_Resolution: 1.5
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
The following is a list of the attributes used in this dataset: ST = Original state dataset the polygon comes from. GEO_CODE = Geologic formation code. ST_CODE = Concatenation of ST and GEO_CODE. SUBS_CODE = Substrate Code. SUBSTRATE = Substrate description.

Description of Codes: GEO_CODE is from the source geology map. See source information for appropriate state. SUBS_CODE and SUBSTRATE were defined by NatureServe, and were assigned by the originator(s) of this dataset.

The following lists each SUBS_CODE and corresponding SUBSTRATE definitions identified in this dataset: QYA = Quaternary age younger alluvium and surficial deposits. QOA = Quaternary age older alluvium and surficial deposits. EOS = Unconsolidated Aeolian sand deposits both active and stabilized. SND = Sandstone dominated formations of all ages. SLM = Siltstone and or mudstone dominated formations of all ages. SHL = Shale dominated formations of all ages. CLM = Carbonate dominated formations either limestone or dolomites of all ages. EVP = Evaporite units either halite, gypsum, or other saline mineral dominated formation. GSL = Metamorphic or igneous units with a dominantly silicic composition all ages. BMC = Metamorphic or igneous units with dominantly mafic composition all ages. H2O = Water. UNK = Unable to determine substrate type.

Entity_and_Attribute_Detail_Citation:
For GEO_CODE see pertinent geologic map source information. For SUBSTRATE, unpublished NatureServe document (2003).

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: John Lowry
Contact_Organization: RS/GIS Laboratory, Utah State University,
Contact_Address:
Address_Type: mailing address
Address: UMC 5275, Utah State University
City: Logan
State_or_Province: Utah
Postal_Code: 84322-5275
Country: U.S.A.
Contact_Voice_Telephone: 435-797-0653
Contact_Electronic_Mail_Address: jlowry@gis.usu.edu
Resource_Description: Southwest ReGAP geology dataset
Distribution_Liability:
The RS/GIS Laboratory and Utah State University or their staff take no responsibility for the distribution, content, or use of these data.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ESRI ArcInfo coverage or ESRI ArcView Shapefile
Format_Version_Number: Unix ArcInfo Workstation 8.0.2. or ArcView 3.3
File_Decompression_Technique:
Compression type *.zip or *.tgz. For windows use WinZip. For UNIX use tar -zxf <filename>.tgz
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://earth.gis.usu.edu/swgap/>
Fees: none

Metadata_Reference_Information:
Metadata_Date: 20040811
Metadata_Review_Date: 20040915
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: John Lowry
Contact_Organization: RS/GIS Laboratory, Utah State University
Contact_Address:
Address_Type: mailing
Address: UMC 5275, Utah State University
City: Logan
State_or_Province: Utah
Postal_Code: 84322-5275
Country: U.S.A.
Contact_Voice_Telephone: 435-797-0653
Contact_Electronic_Mail_Address: jlowry@gis.usu.edu
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: none
Metadata_Use_Constraints: none
Metadata_Security_Information:
Metadata_Security_Classification_System: none
Metadata_Security_Classification: unclassified
Metadata_Security_Handling_Description: none
Metadata_Language: English

Generated by mp version 2.7.33 on Thu Sep 23 17:27:11 2004