Metadata: Identification_Information: Citation: Citation_Information: Originator: Daniel H. Knepper, Jr. Originator: Gregory N. Green Originator: William H. Langer Publication_Date: 1999 Title: Lithology and Aggregate Quality Attributes for the Digital Geologic Map of Colorado Edition: version 1.0 Geospatial_Data_Presentation_Form: tabular digital data Series_Information: Series_Name: U.S. Geological Survey Open File Report Issue_Identification: OFR 99-0029 Publication_Information: Publication_Place: Denver Publisher: U.S. Geological Survey Online_Linkage: http://greenwood.cr.usgs.gov/pub/open-file-reports/ofr-99-0029 Description: Abstract: This geologic map was prepared as a part of a study of digital methods and techniques as applied to complex geologic maps. The geologic map was digitized from the original scribe sheets used to prepare the published Geologic Map of Colorado (Tweto 1979). Consequently the digital version is at 1:500,000 scale using the Lambert Conformal Conic map projection parameters of the state base map. Stable base contact prints of the scribe sheets were scanned on a Tektronix 4991 digital scanner. The scanner automatically converts the scanned image to an ASCII vector format. These vectors were transferred to a VAX minicomputer, where they were then loaded into ARC/INFO. Each vector and polygon was given attributes derived from the original 1979 geologic map. Purpose: This dataset was developed to provide geologic map GIS database of Colorado for use in future spatial analysis by a variety of users. This database is not meant to be used or displayed at any scale other than 1:500,000. Supplemental_Information: This data base consists of three major Arc/Info GIS datasets: - one the geologic map with faults, formations and volcanic vents, - two the index and correlation chart and - three the sources of geologic data. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -109.1 East_Bounding_Coordinate: -102.0 North_Bounding_Coordinate: 41.0 South_Bounding_Coordinate: 37.0 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: geology Place: Place_Keyword_Thesaurus: none Place_Keyword: USA Place_Keyword: Colorado Access_Constraints: none Use_Constraints: This database is not meant to be used or displayed at any scale other than 1:500,000. Any hardcopies utilizing these data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the U.S. Geological Survey. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Gregory N. Green Contact_Organization: U.S. Geological Survey Contact_Position: geologist Contact_Address: Address_Type: mailing and physical address Address: MS 905, USGS, Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: (303) 236-5390 Contact_Electronic_Mail_Address: ggreen@usgs.gov Data_Set_Credit: Gregory N. Green of U.S. Geological Survey Native_Data_Set_Environment: VAX/VMS 5.4 ARC/INFO version 5.0 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: compiled mapping field checked Logical_Consistency_Report: manual check against orginals Completeness_Report: finished Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Compiled from 1:250,000 scale maps Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Ogden Tweto Publication_Date: 1979 Title: The Geologic Map of Colorado Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Special Publication Issue_Identification: The Geologic Map of Colorado Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S.Geological Survey Source_Scale_Denominator: 500000 Type_of_Source_Media: map Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1979 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Tweto(1979) Source_Contribution: Ogden Tweto created the state geologic map from new and existing geologic mapping. Greg Green converted this to ARC/INFO in 1992. Dan Knepper, Greg Green and Bill Langer createted this extensive lithologic attribute data in 1999. Process_Step: Process_Description: Two sets of attributes have been defined for the lithologic units contained on the Geologic Map of Colorado by Tweto, 1979. In addition to the identificationnumber, map unit symbol, and age symbol based on Green's digital Colorado Map from 1992, the first set describes the mode of formation, composition, texture, and variability of the mapped units according to descriptions on the Explanation of the Geologic Map of Colorado. The second set estimates the physical and chemical properties of each unit for use as natural aggregate in Portland cement concrete and identifies other known uses of each unit for construction materials. Together, these newly-defined attributes can be used to search the digital Geologic Map of Colorado database for units with broad range of lithologic characteristics, as well as to evaluate natural aggregate potential on a statewide basis. Process_Date: 1999 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Lambert Conformal Conic Lambert_Conformal_Conic: Standard_Parallel: 33 Standard_Parallel: 45 Longitude_of_Central_Meridian: -105.5 Latitude_of_Projection_Origin: 0 False_Easting: 0.00000 False_Northing: 0.00000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 1.0 Ordinate_Resolution: 1.0 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: Please see the file ofr-99-0029.pdf text on the source CD-ROM disk or at http://greenwood.cr.usgs.gov/pub/open-file-reports/of99-29.pdf or http://greenwood.cr.usgs.gov/pub/open-file-reports/of99-29.doc for a listing of the geologic line values and for descriptions of the different formation polygon attributes. These text files list formation names and descriptions assigned to each map unit. Entity_and_Attribute_Detail_Citation: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Information Services Contact_Position: Open File Services Contact_Address: Address_Type: mailing and physical address Address: Open-File Reports, PO Box 25286, Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 1-303-202-4700 Contact_Electronic_Mail_Address: infoservices@usgs.gov Contact_Facsimile_Telephone: 1-303-202-4188 Distribution_Liability: This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey (USGS) editorial standard nor with the North American stratigraphic codes. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the USGS. Although these data have been used by the USGS and have been successfully imported into data base programs, no warranty, expressed or implied, is made by the USGS as to how successfully or accurately the data can be imported into any specific application software running on any specific hardware platform. The fact of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith. This data base GIS is not meant to be used or displayed at any scale other than 1:500,000. Resource_Description: USGS Open-File Report 99-0029 Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARC/INFO export Format_Version_Number: 6.1.2 Format_Information_Content: Colorado Geologic Map File_Decompression_Technique: none Transfer_Size: 20 Mbyte Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://greenwood.cr.usgs.gov/pub/open-file-reports/ofr-99-0029 Access_Instructions: anonymous FTP Fees: none Metadata_Reference_Information: Metadata_Date: 20011210 Metadata_Review_Date: 19990302 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Gregory N. Green Contact_Address: Address_Type: mailing and physical address Address: MS 905, USGS, Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 1-303-236-5390 Contact_Electronic_Mail_Address: ggreen@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: Version of June 8, 1994 Metadata_Access_Constraints: none Metadata_Use_Constraints: This data base GIS is not meant to be used or displayed at any scale other than 1:500,000.