Identification_Information:
     Citation:
          Citation_Information:
               Originator: U.S. Geological Survey
               Publication_Date: 200206
               Publication_Time: Unknown
               Title: Map showing Geology, Oil and Gas Fields, and
                         Geologic Provinces of Africa, version 2.0
               Edition: 2
               Geospatial_Data_Presentation_Form: vector digital data
               Online_Linkage: <http://energy.cr.usgs.gov>
     Description:
          Abstract:
               geo2_7 - Surficial geology. ArcInfo polygon coverage. Item
               "glg" in Feature Attribute Table (FAT) is for geologic age.
          Purpose:
               The Data provide Government, geological community,
               consultants, and public with information on geologic basis
               of African
               continent. It intented to use as a reference spatial data.
     Time_Period_of_Content:
          Time_Period_Information:
               Single_Date/Time:
                    Calendar_Date: 2002
          Currentness_Reference: publication date
     Status:
          Progress: Complete
          Maintenance_and_Update_Frequency: None planned
     Spatial_Domain:
          Bounding_Coordinates:
               West_Bounding_Coordinate: -22.413353
               East_Bounding_Coordinate: 64.540365
               North_Bounding_Coordinate: 40.003867
               South_Bounding_Coordinate: -38.574876
     Keywords:
          Theme:
               Theme_Keyword_Thesaurus: None
               Theme_Keyword: Surface geology
          Place:
               Place_Keyword: Africa
     Access_Constraints: None
     Use_Constraints: None
     Point_of_Contact:
          Contact_Information:
               Contact_Person_Primary:
                    Contact_Person: Feliks Persits
                    Contact_Organization: U.S. Geological Survey, Central
                    Region
               Contact_Position: U.S.G.S. contractor
               Contact_Address:
                    Address_Type: mailing and physical address
                    Address:
                         U.S. Geological Survey Energy Resource Team, Box
                         25046, Denver Federal Center, MS 939
                    City: Denver
                    State_or_Province: CO
                    Postal_Code: 80225-0046
                    Country: USA
               Contact_Voice_Telephone: 303-236-3612
               Contact_Facsimile_Telephone: 303-236-8822
               Contact_Electronic_Mail_Address: fpersits@usgs.gov
               Hours_of_Service: 8:00 am - 4:00 pm MST
     Browse_Graphic:
          Browse_Graphic_File_Name: africa.pdf
          Browse_Graphic_File_Type: PDF
     Data_Set_Credit:
          Digital Map Compilation - Feliks Persits
          Geological Attribution - Feliks Persits, Thomas Ahlbrandt,
          Michelle Tuttle, Ronald Charpentier, Michael Brownfield
     Security_Information:
          Security_Classification: Unclassified
     Native_Data_Set_Environment:
          Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2;
          ESRI ArcCatalog 8.1.1.649


Data_Quality_Information:
     Attribute_Accuracy:
          Attribute_Accuracy_Report:
               Standard ARC/INFO attributes accuracy in Feature Attributes
               Tables like AREA, PERIMETER, etc. depend on horizontal
               positional accuracy. All the additional attributes are
               character type.
          Quantitative_Attribute_Accuracy_Assessment:
               Attribute_Accuracy_Explanation:
                    All the Attributes besides standard ARC/INFO are
                    character type. Standard verification of attributes
                    reliability has been
                    done by ARC/INFO EDITPLOT program to find out polygons
                    without assigned character value or with more than one
                    value.
     Logical_Consistency_Report:
          Since Data set is the ARC/INFO coverage topological consistency
          are supported. Fuzzy tolerance has been maintained the same
          through
          all processing steps. Based on fuzzy tolerance value all
          undershoots and overshoots were detected and deleted.
          A comparison between color plot and original paper map was
          carried out by visual comparison. Color plots in 1:5,000,000
          scale were
          superimposed on every of correspondent original map sheets. All
          detected errors in attributes were corrected.
     Completeness_Report:
                 Several geologic age subdivisions on the original (UNESCO)
     1:5,000,000 geologic map were combined into single unit.
           As of May, 2000 generalizations of the original geologic map
          (UNESCO) were carried out:
           1.  All the Cretaceous units were combined into one.
           2. All the Precambrian subdivisions were combined into one.
          Boundaries are correct as of July, 1997.
     Positional_Accuracy:
          Horizontal_Positional_Accuracy:
               Horizontal_Positional_Accuracy_Report:
                    1. Original geological maps are of 500 m. maximum
                    accuracy (0.1 mm on paper map of 1:5,000,000 scale).
                    2. Scanned images were of 200 dot/inch resolution (0.12
                    mm on paper). That is why fuzzy tolerance for CLEAN
                    program
                    in ARC/INFO was set to 500 m. Average positional
                    accuracy can be evaluated as 1000 m (twice of fuzzy
                    tolerance).
               Quantitative_Horizontal_Positional_Accuracy_Assessment:
                    Horizontal_Positional_Accuracy_Value: 1000 m
     Lineage:
          Source_Information:
               Source_Citation:
                    Citation_Information:
                         Originator: Commission for the Geological Map of
                         the World (CGMW)
                         Publication_Date: 1990
                         Title: Carte gologique internationale de
                         l'Afrique
                         Edition: 1987-1990
                         Geospatial_Data_Presentation_Form: map
               Source_Scale_Denominator: 5000000
               Type_of_Source_Media: Paper Geologic Map
               Source_Time_Period_of_Content:
                    Source_Currentness_Reference: publication date
               Source_Citation_Abbreviation: Paper Geologic Map
               Source_Contribution:
                    All the five paper map sheets are used as the sources
                    for creation the correspondent ARC/INFO coverages.
          Process_Step:
               Process_Description:
                    Transparent mylar film was used to extract geologic
                    boundaries from paper geologic maps.
               Process_Date: 1996
               Process_Contact:
                    Contact_Information:
                         Contact_Person_Primary:
                              Contact_Person: Dr. Thomas Ahlbrandt
                              Contact_Organization: U.S. Geological Survey
                         Contact_Position: Project Chief
                         Contact_Voice_Telephone: 303-236-5776
                         Contact_Facsimile_Telephone: 303-236-8822
                         Contact_Electronic_Mail_Address:
                         ahlbrandt@usgs.gov
                         Hours_of_Service: 8 - 5 MST
          Process_Step:
               Process_Description:
                    Scanning mylars on large format Anatech Eagle scanner
                    in binary mode. Vectorizing binary images in UNIX
                    ArcInfo 7.0.1 to produce ArcInfo coverages by GRIDLINE
                    utility.
               Source_Used_Citation_Abbreviation: Mylar scanning
               Process_Date: 1996
               Source_Produced_Citation_Abbreviation: ArcInfo coverages
               from binary images
               Process_Contact:
                    Contact_Information:
                         Contact_Person_Primary:
                              Contact_Person: Ronald Charpentier
                              Contact_Organization: US Geological Survey
                         Contact_Position: Senior Geologist
                         Contact_Voice_Telephone: 303-236-5766
                         Contact_Facsimile_Telephone: 303-236-8822
                         Contact_Electronic_Mail_Address:
                         charpentier@usgs.gov
                         Hours_of_Service: 8 - 5 MST
          Process_Step:
               Process_Description:
                    Scanning original paper maps on a large format Anatech
                    Eagle scanner in gray-scale mode.
               Source_Used_Citation_Abbreviation: Paper maps
               Process_Date: 1997
               Source_Produced_Citation_Abbreviation: Gray-scale images
               Process_Contact:
                    Contact_Information:
                         Contact_Person_Primary:
                              Contact_Person: Feliks Persits
                              Contact_Organization: US Geological Survey
                         Contact_Position: GIS Contractor
                         Contact_Address:
                              Address_Type: mailing and physical address
                              Address: Denver Federal Center, P.O. Box
                              25046, MS 939
                              City: Denver
                              State_or_Province: CO
                              Postal_Code: 80225
                              Country: USA
                         Contact_Voice_Telephone: 303-236-3612
                         Contact_Facsimile_Telephone: 303-236-8822
                         Contact_Electronic_Mail_Address: fpersits@usgs.gov
                         Hours_of_Service: 8 - 5 MST
          Process_Step:
               Process_Description:
                    Geologic age attributes were assigned to ArcInfo
                    polygon coverage
               Source_Used_Citation_Abbreviation: ArcInfo coverages from
               binary images
               Process_Date: 1996
               Source_Produced_Citation_Abbreviation: Attributed ArcInfo
               coverages from binary images
               Process_Contact:
                    Contact_Information:
                         Contact_Person_Primary:
                              Contact_Person: Ronald. Charpentier
                              Contact_Organization: US Geologcal Survey
                         Contact_Position: GIS Contractor
                         Contact_Voice_Telephone: 303-236-3612
                         Contact_Facsimile_Telephone: 303-236-8822
                         Contact_Electronic_Mail_Address: fpersits@usgs.gov
                         Hours_of_Service: 5 - 8 MST
          Process_Step:
               Process_Description:
                    ArcInfo coverages from binary images were transformed
                    to Transverse Mercator projection with central meridian
                    of 160 E and scale factor at a central meridian equal
                    to 0.995.
               Source_Used_Citation_Abbreviation: Attribited ArcInfo
               coverages
               Process_Date: 1996
               Source_Produced_Citation_Abbreviation: Projected ArcInfo
               coverages from binary images
               Process_Contact:
                    Contact_Information:
                         Contact_Person_Primary:
                              Contact_Person: Feliks Persits
                              Contact_Organization: US Geological Survey
                         Contact_Position: GIS Contractor
                         Contact_Voice_Telephone: 303-236-3612
                         Contact_Facsimile_Telephone: 303-236-8822
                         Contact_Electronic_Mail_Address: fpersits@usgs.gov
                         Hours_of_Service: 5 - 8 MST
          Process_Step:
               Process_Description:
                    Gray-scale images were georeferenced by ArcInfo
                    REGISTER and RECTIFY utilities by using projected
                    ArcInfo coverages from binary images.
               Source_Used_Citation_Abbreviation: Gray-scale images
               Process_Date: 1997
               Source_Produced_Citation_Abbreviation: Georeferenced
               gray-scale images
               Process_Contact:
                    Contact_Information:
                         Contact_Person_Primary:
                              Contact_Person: Feliks Persits
                              Contact_Organization: U.S. Geological Survey
                         Contact_Position: GIS Contractor
                         Contact_Voice_Telephone: 303-236-3612
                         Contact_Facsimile_Telephone: 303-236-8822
                         Contact_Electronic_Mail_Address: fpersits@usgs.gov
                         Hours_of_Service: 5 - 8 MST
          Process_Step:
               Process_Description:
                    Verification and correction of line work and geologic
                    attributing of projected ArcInfo coverages by using
                    georeferenced gray-scale images as background images in
                    ArcInfo ArcEdit 7.0.2
               Source_Used_Citation_Abbreviation: Projected ArcInfo
               coverages
               Process_Date: 1997
               Source_Produced_Citation_Abbreviation: Corrected ArcInfo
               coverages
               Process_Contact:
                    Contact_Information:
                         Contact_Person_Primary:
                              Contact_Person: Feliks Persits
                              Contact_Organization: U.S. Geological Survey
                         Contact_Position: GIS Contractor
                         Contact_Address:
                              Address_Type: mailing and physical address
                              Address: Denver Federal Center, P.O. Box
                              25046, MS 939
                              City: Denver
                              State_or_Province: CO
                              Postal_Code: 80225
                              Country: USA
                         Contact_Voice_Telephone: 303-236-3612
                         Contact_Facsimile_Telephone: 303-236-8822
                         Contact_Electronic_Mail_Address: fpersits@usgs.gov
                         Hours_of_Service: 8 - 5 MST
          Process_Step:
               Process_Description:
                    Corrected ArcInfo coverages were projected to
                    geographic coordinates and to Mercator projection
                    with a central meridian of 250 E by ArcInfo PROJECT
                    utility.
               Source_Used_Citation_Abbreviation: Corrected ArcInfo
               coverages
               Process_Date: 1997
               Source_Produced_Citation_Abbreviation:
                    Final ArcInfo coverages in Mercator projection and in
                    geographic coordinates.
               Process_Contact:
                    Contact_Information:
                         Contact_Person_Primary:
                              Contact_Person: Feliks Persits
                              Contact_Organization: GIS Contractor
                         Contact_Address:
                              Address_Type: mailing and physical address
                              Address: Denver Federal Center, P.O. Box
                              25046, MS 939
                              City: Denver
                              State_or_Province: CO
                              Postal_Code: 80225
                              Country: USA
                         Contact_Voice_Telephone: 303-236-3612
                         Contact_Facsimile_Telephone: 303-236-8822
                         Contact_Electronic_Mail_Address: fpersits@usgs.gov
                         Hours_of_Service: 5 - 8 MST


Spatial_Data_Organization_Information:
     Direct_Spatial_Reference_Method: Vector
     Point_and_Vector_Object_Information:
          SDTS_Terms_Description:
               SDTS_Point_and_Vector_Object_Type: G-polygon
               Point_and_Vector_Object_Count: 11977

  

Spatial_Reference_Information:
     Horizontal_Coordinate_System_Definition:
          Planar:
               Map_Projection:
                    Map_Projection_Name: Mercator
                    Mercator:
                         Standard_Parallel: 0.00
                         Longitude_of_Central_Meridian: 25.00
                         False_Easting: 0.00
                         False_Northing: 0.00
               Planar_Coordinate_Information:
                    Planar_Coordinate_Encoding_Method: coordinate pair
                    Coordinate_Representation:
                         Abscissa_Resolution: 0.016384
                         Ordinate_Resolution: 0.016384
                    Planar_Distance_Units: meters
          Geodetic_Model:
               Horizontal_Datum_Name: D_WGS_1984
               Ellipsoid_Name: WGS_1984
               Semi-major_Axis: 6378137.000000
               Denominator_of_Flattening_Ratio: 298.257224

  

Entity_and_Attribute_Information:
     Detailed_Description:
          Entity_Type:
               Entity_Type_Label: geo2_7t_polygon
          Attribute:
               Attribute_Label: OBJECTID
          Attribute:
               Attribute_Label: Shape
               Attribute_Definition: Feature geometry.
               Attribute_Definition_Source: ESRI
               Attribute_Domain_Values:
                    Unrepresentable_Domain: Coordinates defining the
                    features.
          Attribute:
               Attribute_Label: AREA
               Attribute_Definition: Area of polygon
               Attribute_Definition_Source: Software computed
               Attribute_Domain_Values:
               Range_Domain:
               Range_Domain_Minimum: 928710.10
               Range_Domain_Maximum: 3067273961704.0
          Attribute:
               Attribute_Label: PERIMETER
               Attribute_Definition: Perimeter of polygon
               Attribute_Definition_Source: Software computed
               Attribute_Domain_Values:
               Range_Domain:
               Range_Domain_Minimum: 4588.40
               Range_Domain_Maximum: 169603590.891
          Attribute:
               Attribute_Label: GEO2_7T_
               Attribute_Definition: Internal ID
               Attribute_Definition_Source: Software computed
               Attribute_Domain_Values:
               Range_Domain:
               Range_Domain_Minimum: 2
               Range_Domain_Maximum: 11978
          Attribute:
               Attribute_Label: GEO2_7T_ID
               Attribute_Label: GEO2_ID
               Attribute_Definition: User ID
               Attribute_Definition_Source: Software computed
               Attribute_Domain_Values:
               Range_Domain:
               Range_Domain_Minimum: 0
               Range_Domain_Maximum: 11994
          Attribute:
               Attribute_Label: GLG
               Attribute_Definition: Surface Geology Attribute
               Attribute_Definition_Source: U.S.Geological Survey
               Enumerated_Domain:
               "Q" - Quaternary (undivided)
                "Qe" - Holocene
                "Qp" - Pleistocene
                "QT" - Cenozoic
                "T" - Tertiary
                "Mz" - Mesozoic
                "TK" - Tertiary-Cretaceous
                "K" - Cretaceous
                "Kl" - Lower Creteceous"
                "KJ" - Cretaceous-Jurassic
                "J" - Jurassic
                "Jl" - Lower Jurassic
                "JTr" - Jurassic-Triassic
                "Tr" - Triassic
                "Trl" - Lower Triassic
                "MzPz" - Mesozoic-Paleozoic
                "KC" - Cretaceous-Carboniferous
                "JC" - Jurassic-Carboniferous
                "Pz" - Paleozoic
                "P" - Permian
                "TrP" - Triassic-Permian
                "PC" - Permian-Carboniferous
                "C" - Carboniferous
                "CD" - Carboniferos-Devonian
                "D" - Devonian
                "Du" - Upper/Middle Devonian
                "DS" - Devonian-Silurian
                "S" - Silurian
                "SO" - Silurian-Ordovician
                "OCm" - Ordovician-Camrian
                "pCm" - Precambrian
                "PzpC" - Paleozoic-Precambrian
                "Qv" - Quaternary Igneous
                "Ti" - Tertiary Igneous
                "Mi" - Mesozoic Igneous
                "MiPi" - Mz-Pz Igneous
                "Pi" - Paleozoic Igneous
                "Kimb" - Kimberlites
                "S_d" - Salt Domes
                "H2O" - Water (River 0r Lake)
                "Sea" - Sea
                "oth"S_d" - Areas outside of African Continent"
               Enumerated_Domain_Value_Definition_Source: U.S. Geological
               Survey.
          Attribute:
               Attribute_Label: Shape_Length
               Attribute_Definition: Length of feature in internal units.
               Attribute_Definition_Source: ESRI
               Attribute_Domain_Values:
                    Unrepresentable_Domain: Positive real numbers that are
                    automatically generated.
          Attribute:
               Attribute_Label: Shape_Area
               Attribute_Definition: Area of feature in internal units
               squared.
               Attribute_Definition_Source: ESRI
               Attribute_Domain_Values:
                    Unrepresentable_Domain: Positive real numbers that are
                    automatically generated.


Distribution_Information:
     Distributor:
          Contact_Information:
                    Contact_Organization: U.S. Geological Survey Earth
          Science Information Center (ESIC)
               Contact_Person_Primary:Dorothy Tanti
               Contact_Address:
                    Address_Type: mailing and physical address
                    Address:
                        U.S.Geological Survey Box 25046 Building 25 Denver
                         Federal Center
                    City: Denver
                    State_or_Province: CO
                    Postal_Code: 80225-0286
                    Country: USA
                    Contact_Voice_Telephone: 303.236.1647
                    Contact_Electronic_Mail_Address: eteamdisks@usgs.gov
                    Hours_of_Service: 8:00 am - 4:00 pm MST
     Standard_Order_Process:
          Digital_Form:
               Digital_Transfer_Information:
                    Format_Name: ARCE
                    Format_Specification:
                         ArcInfo coverage
                         ArcView shape file
                         ARC/INFO Export format
                         ARC/INFO Generate format ASCII file, formatted for
                         text attributes
                         SDTS Spatial Data Transfer Standard (Federal
                         Information Processing Standard 173)


Metadata_Reference_Information:
     Metadata_Date: 20011019
     Metadata_Contact:
                   Contact_Information:
                              Contact_Organization_Primary:
                                         Contact_Organization: U.S.
     Geological Survey
                                         Contact_Person: David A. Ferderer
                                         Contact_Position: Data library
     manager, Central Energy Resources Team
                              Contact_Address:
                                         Address_Type:mailing and physical
     address
                                        Address: U.S. Geological Survey, MS
     939 Box 25046 Denver Federal Center
                                        City: .Denver
                                        State_or_Province: CO.
                                        Postal_Code: 80225-0046
                                        Contact_Voice_Telephone: (303)
     236-3611
                                        Contact_Facsimile_Telephone: (303)
     236-8822
                                        Contact_Electronic_Mail_Address:
     dferdere@usgs.gov
                                        Hours_of_Service: 8 am. to 4 pm.
     MST
     Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial
     Metadata
     Metadata_Standard_Version: FGDC-STD-001-1998
     Metadata_Time_Convention: local time
     Metadata_Extensions:
          Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
          Profile_Name: ESRI Metadata Profile