Identification_Information: Citation: Citation_Information: Originator: Robert W. Blair, Jr. Originator: Douglas B. Yager Originator: Stanley E. Church Publication_Date: 2002 Title: Surficial geologic maps along the riparian zone of the Animas River and its headwater tributaries, Silverton to Durango, Colorado, with upper Animas River watershed gradient profiles Edition: 1.0 Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Digital Data Series Issue_Identification: DDS-71 Publication_Information: Publication_Place: Denver, Colorado Publisher: U.S. Geological Survey Online_Linkage: https://pubs.er.usgs.gov/preview/ds71 Description: Abstract: This product consists of Adobe Acrobat .PDF format documents for 10 surficial geologic strip maps along the Animas River watershed from its major headwater tributaries, south to Durango, Colo. The Animas River originates in the San Juan Mountains north of the historic mining town of Silverton, Colo. The surficial geologic maps identify surficial deposits, such as floodplain, and terrace gravels, alluvial fans, glacial till, talus, colluvium, landslides, and bogs. Sixteen primary units were mapped that included human-related deposits and structures, eight alluvial deposits, four colluvial deposits, one glacial deposit, one travertine deposit, and undifferentiated bedrock. Each of the surficial geologic strip maps has .PDF links to surficial geology photographs, which enables the user to take a virtual tour of these deposits. Geochemical data collected from mapped surficial deposits that pre-date and post-date mining activity have aided in determining the geochemical baseline in the watershed. Several photographs with their corresponding geochemical baseline profiles are accessible through .PDF links from several of the maps. A single coverage for all surficial deposits mapped is included as an ArcInfo shape file and as an Arc Export format .e00 file. Purpose: This map data was completed for the purpose of identifying the surficial deposits along the riparian zone of the Animas River and its major headwater tributaries. Mapped surficial units that were deposited before and after the onset of mining were analyzed to determine the geochemical baseline of sediments in the watershed. Supplemental_Information: This product consists of one vector coverage. This coverage is that of the surficial deposits mapped along the riparian zone of the Animas River from its headwater tributaries above Silverton to Durango, Colo. 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: -107.78353 East_Bounding_Coordinate: -107.55006 North_Bounding_Coordinate: 37.93581 South_Bounding_Coordinate: 37.29523 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: Animas River Watershed Abandoned Mine Lands Initiative Theme_Keyword: U.S. Geological Survey Minerals Team Theme_Keyword: Surficial geology Theme_Keyword: Holocene geology Theme_Keyword: Quaternary geology Theme_Keyword: Talus Theme_Keyword: Terrace Theme_Keyword: Alluvial fan Theme_Keyword: Landslide Theme_Keyword: Glacial till Theme_Keyword: Debris cone Theme_Keyword: Oxbow Theme_Keyword: Bedrock Theme_Keyword: Geochemical baseline Theme_Keyword: Floodplain Theme_Keyword: Riparian zone Place: Place_Keyword_Thesaurus: U.S. Board on Geographic Names (BGN) Geographic Names Information System (GNIS) Place_Keyword: Animas River watershed Place_Keyword: southwestern Colorado Place_Keyword: Silverton Place_Keyword: San Juan County Place_Keyword: La Plata County Place_Keyword: San Juan volcanic field Place_Keyword: San Juan Mountains Place_Keyword: San Juan National Forest Access_Constraints: None Use_Constraints: The intended scale of use for this data is 1:24,000. 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: Director, Geology, Geophysics, and Geochemistry Science Center Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: U.S. Geological Survey, Box 25046, MS 973 City: Denver State_or_Province: Colorado Postal_Code: 80225 Country: USA Browse_Graphic: Browse_Graphic_File_Name: Browse_Graphic_File_Description: pamphlet with links to graphic representation of 10 map layouts Browse_Graphic_File_Type: PDF Data_Set_Credit: Robert W. Blair, Jr., mapped the surficial deposits. Douglas B. Yager created the ArcInfo coverages. Native_Data_Set_Environment: ArcInfo 7.2.1, Sun Unix platform Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: 100 percent of surficial deposit unit attributes were compared to paper maps for accuracy when compiled and digitized. A quantitative assessment of attribute accuracy was not attempted. Frequency tests were run on the arc and polygon labels to ensure that no features are unlabeled. The attributes have been checked by both the authors against unpublished field maps, and preliminary drafted versions of the maps. Logical_Consistency_Report: Polygon and chain-node topology present. Each polygon is closed and has one label point. Polygon and chain-node topology present. Completeness_Report: Completeness of the data is a function of the scale of source maps used when compiling data from aerial photographs to 1:24,000-scale topographic base materials, and the task of mapping only major tributaries in the headwater region of the upper Animas River watershed and along the main stem of the Animas River. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The estimated horizontal positional accuracy of the data is 10 meters. All data used from published and unpublished digital sources are limited by the accuracy of that data. Attempts were made to verify the accuracy of these data by comparison to published topographic data and overlap with other digital data. Lineage: Process_Step: Process_Description: U.S. Department of Agricultural stereo color aerial photographs were used to construct the surficial geologic maps along the Animas River watershed. Photo sets were flown 9/3/73 and include project numbers F16-08067 and F16-08111. Photo scale is approximately 1:20,500. These are the largest scale photos available for the Animas River watershed and they provide the best spatial and tonal detail. Some crosschecking was done with NASA high altitude color IR photos flown 8/26/89 (NAPP 1127) with a scale of 1:46,000. Surficial deposits were mapped by R. Blair while viewing color aerial photos in stereo by interpreting morphologic, color, and textural boundary differences. Mapping was done on clear plastic overlays directly over photos using India ink drafting pens. Standard pocket stereo glasses with a magnification of 2.5 times were used to view photos. Photo maps (plastic overlays) were scaled to as much as 1:24,000 using variable scale copy machines. The map boundaries were then transferred by hand to USGS topographic green-line base mylar maps while simultaneously checking the stereo aerial photos to maintain accuracy. Mapping included surficial deposits on the valley floor and deposits within approximately one hundred to two hundred meters up the valley sides. The mapped areas were spot field checked in 1998 and 1999. Process_Date: 1998 to 1999 Process_Step: Process_Description: Drafted line work was scanned with a scan resolution of 400 dpi. ArcInfo commands, IMAGEGRID and GRIDLINE, were used for raster to vector conversion. The vector cover produced was projected first with use of the ARC INFO TRANSFORM command. The vector coverage was TRANSFORMED into an empty TICCOV derived from the vector coverage with defined corner coordinate tics with geographic data. Once transformed, the coverage was projected using ArcInfo's project command. ARCEDIT's EDGEMATCH command was used to join adjacent quadrangle map data. Label errors were determined and corrected and the coverage topology was established with the CLEAN command. Process_Date: 1999 to 2001 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 13 Transverse_Mercator: Scale_Factor_at_Central_Meridian: .9996 Longitude_of_Central_Meridian: -105.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 65 Ordinate_Resolution: 65 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: DATABASE STRUCTURE--The database structure of the map consists of one coverage, SURF_DEP, with the following INFO attribute items. AREA PERIMETER SURF_DEP # SURF_DEP-ID DEPOSIT_TYPE VALUE The coverage SURF_DEP contains all contact lines and label points for each polygon. The SURF_DEP.PAT INFO file has attribute fields for INFO ITEMS DEPOSIT_TYPE and VALUE. DEPOSIT_TYPE corresponds to a unique symbol that identifies specific surficial deposit types. Some units have a mixed deposit type such as b/t where both bog and terrace deposits represent a polygon. VALUE is a unique numeric identifier that represents each general class of surficial deposits. Note that where a mapped unit has multiple generations of terraces that are represented by t1, t2, and t3 in the DEPOSIT_TYPE field, these have the same numeric VALUE. The VALUE attribute also corresponds to the ArcInfo colornames.shd symbolset number used for color shading. The following detailed overview discusses all of the non-common attributes included in the SURF_DEP coverage: The ITEM DEPOSIT_TYPE is described as follows: H = Human-related deposits and structures Fp = floodplain deposits Rfp = reworked floodplain deposits T = terrace deposits undifferentiated based on comparative relative ages t1,t2,t3,t4 = terrace deposits, with higher number corresponding to older terraces rt = reworked terrace rt1 = reworked terrace (relative order of formation 1) rt2 = reworked terrace (relative order of formation 2) vd = valley deposits rvd = reworked valley deposits ovd = old valley deposits ox = oxbow deposits, abandoned channels f = fan deposits undifferentiated based on comparative relative ages f1,f2,f3 = fan deposits, with higher number corresponding to older fans rf = reworked fan b = bog deposits ib = iron bog deposits c = colluvial deposits rc = reworked colluvium dc = debris cone deposits ta = talus deposits ls = landslide deposits ls1,ls2 = landslide deposits, with higher number corresponding to older landslides m = glacial till ma,ms = Animas City (ma) and Spring Creek (ms) glacial till deposits m? = possible glacial till rm = reworked glacial till rm? = possible reworked glacial till c/ovd = mixed colluvial and old valley deposits c/m = mixed colluvial and glacial till deposits m/c = mixed glacial till and colluvial deposits f/m = mixed fan and glacial till deposits ls/m = mixed landslide and glacial till deposits t/m = mixed terrace and glacial till deposits f/t = mixed fan and terrace deposits t/b = mixed terrace and bog deposits B/c = mixed bedrock and colluvial deposits B/fp = mixed bedrock and floodplain deposits B/ls = mixed bedrock and landslide deposits B/m = mixed bedrock and glacial till deposits td = travertine deposits B = bedrock rB = reworked bedrock w = water L =lake The INFO file item VALUE is populated with a numeric value that corresponds to the ArcInfo colornames.shd shadeset file and is also a unique value that represents each general class of surficial deposit types. Note that a deposit type with multiple generations of deposits such as t1, t2, and t3 have the same numeric value. Also, when there are mixed units, the value recorded in the VALUE field represents the first deposit type reported in the mixed deposit, that is, the value for t in the case of the unit t/b. The DEPOSIT_TYPES and corresponding numeric VALUE attributes are as follows: H = 4 fp = 3 t = 6 vd = 10 rvd = 10 ovd = 12 ox = 86 f = 13 rf = 13 f1 = 13 f2 = 13 f3 = 13 f/m = 13 b = 8 ib = 14 c = 82 rc = 82 dc = 18 ta = 80 ls = 17 ls1 = 17 ls2 = 17 m = 81 ma = 81 ms = 81 m? = 81 rm = 81 rm? = 81 c/ovd = 82 c/m = 82 m/c = 81 f/m = 13 ls/m = 17 t/m = 6 f/t = 13 t/b = 6 B/c = 25 B/fp = 25 B/ls = 25 B/m = 25 td = 109 B = 25 rB = 25 w = 21 L = 21 Entity_and_Attribute_Detail_Citation: none Distribution_Liability: The U.S. Geological Survey (USGS) provides these geographic data "as is". The USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. The USGS further makes no warranties, either expressed or implied, as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers at the USGS, no warranty, expressed or implied, is made by the USGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARC Export and Shape File Format Format_Version_Number: ArcInfo version 8.1 File_Decompression_Technique: .ZIP - Windows ZIP archive - use WinZip or similar to extract Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: Fees: None Metadata_Reference_Information: Metadata_Date: 20020408 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Douglas B. Yager Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: Box 25046 Address: Denver Federal Center, MS-973 City: Denver State_or_Province: Colorado Postal_Code: 80225 Country: USA Contact_Voice_Telephone: (303) 236-2487 Contact_Electronic_Mail_Address: dyager@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: None Metadata_Use_Constraints: None