U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY Bedrock Geologic Map of the Hartland and North Hartland Quadrangle, Windsor County, Vermont, and Sullivan and Grafton Counties, New Hampshire by Gregory J. Walsh (1) Scientific Investigations Map 3361 2016 Prepared in cooperation with the STATE OF VERMONT, VERMONT AGENCY OF NATURAL RESOURCES, VERMONT GEOLOGICAL SURVEY; STATE OF NEW HAMPSHIRE, DEPARTMENT OF ENVIRONMENTAL SERVICES, NEW HAMPSHIRE GEOLOGICAL SURVEY; and the NATIONAL PARK SERVICE ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Date of latest revision: August 05, 2016 ________________________________ (1) U.S. Geological Survey Montpelier, Vermont 05601 This report consists of a map in two sheets and GIS database. All parts are available online at: http://dx.doi.org/10.3133/sim3361. Suggested citation: Walsh, G.J., 2016, Bedrock geologic map of the Hartland and North Hartland quadrangles, Windsor County, Vermont, and Sullivan and Grafton Counties, New Hampshire: U.S. Geological Survey Scientific Investigations Map 3361, 2 sheets, scale 1:24,000, http://dx.doi.org/10.3133/sim3361. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Source of Geologic Data: Original data. Geology mapped by Walsh in 1995-96 and 2010-12; assisted by Bart T. Cubrich in 2011. Geology in Corbin Park in the southeastern corner of the map is from Lyons (1955). Access to Corbin Park was not granted for this study. Digitized by Walsh; assisted by Meghan E. Mason. A preliminary version of the geology of the Hartland quadrangle was published by Walsh (1998). This map supersedes work by Walsh (1998) and the work of Lyons (1955) in the southern half of the Hanover 15-minute quadrangle. Lyons, J.B., 1955, Geology of the Hanover quadrangle, New Hampshire-Vermont: Geological Society of America Bulletin, v. 66, no. 1, scale 1:62,500. Walsh, G.J., 1998, Digital bedrock geologic map of the Vermont part of the Hartland quadrangle, Windsor County, Vermont: U.S. Geological Survey Open-File Report 98-123, 17 p., scale 1:24,000. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Directory layout: Within SIM3361_simplegd.zip | DataSources.xls---Excel spreadsheet of data sources | DescriptionOfMapUnits---Excel spreadsheet of the description of map units | | The following 3 files are in all the zip files: | HartlandNoHartland Geology_NCGMP09_03.mxd---ESRI Arcmap document | readme.txt---ASCII text description (this file) | metadata.txt---Metadata file (also served in other formats html, xml) | |---HartlandNorthHartlandGeology.gdb---ESRI geodatabase of geologic map data | |---KML---Google Earth KMZ files showing: | Arcs and polygons of geology generated from the GIS | |---Layers---ESRI Arcmap layer files. | |---Shapefile---ESRI data of geologic map data in shapefile format | |---Symbols---Symbols used for plotting structure data. | Includes a PDF file showing symbol defintions used in | this project and a custom True Type Font. | Within SIM3361_base.zip |---Base.gdb---Contains basemap image files and vector files | within SIM3361_photos.zip |---Photos.gdb |---Photos---Folder and geodatabase with 943 photographs of the geology and | landscape. Includes an Excel spreadsheet photos.xls At website | |--SIM3361_hartland-sheet1.pdf---Geologic map |---Website----|--SIM3361_hartland-sheet2.pdf---Cross sections, tectonic map, | | and structural maps | | | | (Adobe Portable Document Format = pdf) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ A subset of the contents of this readme.txt file are also included in the metadata for this report. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Direct questions or comments on this report to: Gregory J. Walsh U.S. Geological Survey P.O. Box 628 Montpelier, Vermont 05601 Tel: 802-828-4528 e-mail: gwalsh@usgs.gov ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The GIS point, line, and polygon data associated with this report are provided in two GIS formats: geodatabase (gdb) and Google Earth (kmz). The GIS data were created in ArcGIS and ARC/INFO version 10 on a Dell PC running Windows OS. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Projection Information: New Hampshire State Plane coordinate system (FIPS zone 2800) in NAD83 datum, units in feet ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Computer Files: Some files have been archived using WinZip or 7-zip. Useful URL: http://winzip.com ******************************************************************** The following is a brief description of the geologic data layers, tables, and attributes used in this report. ******************************************************************** The database design follows a simplified version of NCGMP09 http://ngmdb.usgs.gov/Info/standards/NCGMP09/ The GIS database is located in three ESRI geodatabases Base.gdb Photos.gdb HartlandNorthHartlandGeology.gdb Within HartlandNorthHartlandGeology.gdb: The Feature Dataset is named GeologicMap and includes the following FeatureClasses: CartographicLines ContactsAndFaults DataSourcePolys GeologicLines MapUnitPolys OrientationPoints OtherPolysOutcrops And includes the following Geodatabase Tables: DataSources DescriptionOfMapUnits Feature Dataset descriptions: MapUnitPolys - Polygon data layer of bedrock geologic map units Polygons - Fields: CODE - Bedrock geologic map unit code LITH - same as CODE MapUnit - same as CODE DOMAIN – shown on sheet 2 BELT – structural belt shown on sheet 2 IdentityConfidence – All values “certain” Valid entries of CODE are located in an Excel spreadsheet: DescriptionOfMapUnits.xls Bedrock lithology attribute lookup table in Microsoft Excel format. DescriptionOfMapUnits.xls items(fields): DMU_ID = unique identifier ordered from youngest (DMU01) to oldest (DMU46)in the Description of Map Units (sheet 1) Code = map unit designator MapUnit = map unit designator, same as Code Label = map unit designator, same as Code Name = name of map unit FullName = full name of map unit Age = geologic age of map unit RockClass = generalized rock classification Description = simplified description of map unit GeneralLithology = simplified lithologic description ContactsAndFaults - Arcs - Line data layer of geologic contacts and faults Fields: Type Valid entries include: contacts – geologic contact fault – undifferentiated fault old thrust – pre peak metamorphic fault scratch – scratch boundary strike slip – strike-slip fault thrust – thrust fault _________________________________________________________________ OtherPolysOutcrops Unattributed polygon data layer of bedrock outcrops examined during mapping. Not all outcrops in the area were examined in this study. _________________________________________________________________ OrientationPoints Point data layer of ductile and brittle structural geology. point = Number of field station station = Name of field station for data collected in 2010-2012. Station values of 0 were heads-up digitized in Walsh (1998). type = Refers to the specific geologic structure symbol = Arc/Info symbol number strike = Angle measured from north in right-hand rule, units in degrees. dip = Dip value (planar data) or plunge value (linear data), units in degrees dipdir = Direction of dip (planar data) or trend (linear data), units in degrees symbol_ang = Refers to a standard Cartesian angle measured from East; used for symbol rotation and plotting in ArcEdit and ArcPlot, units in degrees Note -- The following three diagrams show an explanation of the geometry of STRIKE, DIPDIR, and SYMBOL_ANG: For STRIKE and DIPDIR: 0 North = 0 | East = 90 270 -----|----- 90 South = 180 | West = 270 180 For SYMBOL_ANG: 90 North = 90 | East = 0 180 -----|----- 0 South = 270 | West = 180 270 SYMBOL_ANG is used for symbol rotation. In ARC/INFO calculate pseudo item $angle = symbol_ang Planar symbols with symbol_ang = 0 look like this: __________ \/ Linear symbols with symbol_ang = 0 look like this: -----> parting = 'Y' indicates the planar feature exhibits parting or fracturing parallel to the surface measured throughgoi = 'Y' indicates the measured brittle feature is throughgoing and passes through the entire outcrop. fracture = - 'Y' indicates feature is a fracture rel_age = Refers to the relative age of ductile fabrics. Valid entries include: n-1 = S1 or S0 n = Relative age is the dominant fabric, S2 n+1 = maybe S2 or S3 n+2 = S3 or S4 plot = Used to exclude symbols in plotting in ArcPlot, valid entry = ‘N’ for no terminatio = - Termination of joints where known; valid entries include: 'blind' and 'abutting’ lith_note = Freeform text indicating the rock type in which the feature was measured. Used for rock type of dikes and sills, and locations where multiple rock types occur at one station topofeat = Topographic feature parallel to a geologic structure observed in the field; valid entries include: 'cliff', ‘stream’, ‘valley’, ‘slope’, and ‘canyon’ rotation = Relative rotation of minor folds; valid entries include: 'cw' = clockwise, and ‘ccw’ = counterclockwise width = Numeric width or thickness of dike or vein; units in meters range from 5 to 0.002 min1 = Primary mineral in veins or metamorphic index mineral; values include: quartz, hornblende, garnet, epidote, calcite, and biotite min2 = Secondary mineral in veins; values include: plagioclase, epidote, and carbonate min3 = Tertiary mineral in veins; values include: plagioclase and epidote faultmov = Movement sense of brittle fault Valid entries include: normal, reverse, left lateral, and right lateral latitude = Raw GPS coordinates collected by Walsh (WGS84 datum) in decimal degrees longitude = Raw GPS coordinates collected by Walsh (WGS84 datum) in decimal degrees xcoord = Map coordinates in NH State Plane feet NAD83 ycoord = Map coordinates in NH State Plane feet NAD83 Azimuth = same as strike for planar data or Dipdir for linear data Inclination = same as dip IdentityConfidence = ‘certain’ Type2 = Refers to the general type of geologic feature. Valid entries include 'planar', 'linear', or 'other' Example Type for Type2 = ‘planar’ include: schistosity, cleavage, etc. Examples Type for Type2 = ‘linear’ include: fold axis, mineral lineation, etc. Examples Type for Type2 = ‘other’ include: quarry, vein, spring, and dike. __________________________________________________________ Photos - Point data layer of photographs; includes 943 landscape and outcrop photos Fields: Point – same as OrientationPoints Type – same as OrientationPoints Sub_type – Valid entry = ‘photo’ Photo_file – Filename of JPG format color photograph Used for hyperlinks (Layer Properties, Display, Support Hyperlinks...) Notes – Description of the photo; if available (optional). Latitude – Raw GPS coordinates collected by Walsh (WGS84 datum) in decimal degrees Longitude – Raw GPS coordinates collected by Walsh (WGS84 datum) in decimal degrees Station – Name of field station PointX - Map coordinates in NH State Plane feet NAD83 PointY - Map coordinates in NH State Plane feet NAD83 The PHOTO Feature Class is designed for use with the ArcMap hyperlink tool. There are 939 digital photographs in this report. Most of the digital photographs are located in the North Hartland quadrangle because a digital camera was not used in Walsh (1998). Some 35mm slides were scanned and added to this database; these photographs were not published in Walsh (1998). Users can copy the photos to the same directory as the feature class, or copy the photos to their own folder and then specify the path: In ArcMap - File, Map Document Properties, Hyperlink Base A Microsoft Excel file (photos.xls) also lists the items in this database. ************************************************************************ Tic marks: The map was registered to the 6 corner tic marks from NH GRANIT: NH GRANIT is New Hampshire's Statewide GIS Clearinghouse http://www.granit.sr.unh.edu/ 126 127 128 + + + + + + 111 112 113 The corner tic marks are from the statewide coverage of USGS 7.5-minute quadrangles (NAD27). ************************************************************************ The following is a description of the base maps used in this report: The base maps consist of a raster and polygon dataset. Raster data set includes 10 files as TIFF format bitmaps and worldfiles: NorthHartlandVTTopography - Hypsography - brown separate NorthHartlandVTWater - Surface water - blue separate NorthHartlandVTCulture1 - Primary culture originally on black separate from 1998; includes roads, buildings, etc. NorthHartlandVTCulture2 - Secondary culture from 1998 photorevisions from purple separate NorthHartlandVTCulture3 - Primary culture originally on red separate from 1998; includes roads. HartlandVTTopography - Hypsography - brown separate HartlandVTWater - Surface water - blue separate HartlandVTCulture1 - Primary culture originally on black separates from 1998; includes roads, buildings, etc. HartlandVTCulture2 - Secondary culture from 1998 photorevisions from purple separate HartlandVTCulture3 - Primary culture originally on red separate from 1998; includes roads. TIFF format maps: Scanned black and white bitmap images in uncompressed TIFF format. Scanned at 400 dpi from film positives of the USGS 7.5-minute Hartland and North Hartland, Vermont-New Hampshire topographic maps (1998). Polygon Feature Classes: Polygons of water bodies from the published topographic map NorthHartlandVTWater HartlandVTWater Images were registered to the 6 corner tics in ArcGIS. ************************************************************************ ---SYMBOLS---ArcPlot and ArcMap symbols used for plotting structure data and symbolizing the map. Includes a PDF file showing structure symbol defintions used in this project and a custom True Type Font (a glossary). (symbols.zip) The structural data included in OrientationPoints was original created as an ArcInfo coverage and converted to a shapefile. The original coverage and shapefile is not included with the published dataset because they were preliminary steps used for creating the map and database. The structural symbols on Sheet 1 were plotted by the author in ArcPlot using custom routines in ArcInfo workstation and custom geology markerset and IGL fonts. The markerset (geology1.mrk) and IGL fonts (fnt025 to fnt040) are included in the symbols folder. Also included is a custom True Type font (USGSGeoNAB-Regular.ttf) which can be added and used in conjunction with the published FGDC fonts in ArcMap. Arcmap layer (*.lyr) files are also provided in this zip file for symbolizing polygons and arcs. The author developed these symbols and definitions during the process of converting data from ESRI ArcInfo workstation to ArcGIS shapefile and then to a final geodatabase format that is compatible with NCGMP09. This is an ongoing and cumbersome process, but one that is necessary in order to move towards a standard data model. Users should contact the author with any questions or problems with the use of these symbols. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ END