U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY Bedrock Geologic Map of the Uxbridge Quadrangle, Worcester County, Massachusetts, and Providence County, Rhode Island [Scale 1:24,000] by Gregory J. Walsh (1) Scientific Investigations Map 3295 2014 version 1.0 Prepared in cooperation with the Commonwealth of Massachusetts Massachusetts Geological Survey Date of latest revision: September 05, 2014 ________________________________ (1) U.S. Geological Survey Montpelier, Vermont 05601 This report consists of a map, text pamphlet, and GIS database. All parts are available online at: http://dx.doi.org/10.3133/sim3295 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Source of Geologic Data: Original data. Geology mapped by Walsh, 2007-2009. Suggested citation: Walsh, G.J., 2014, Bedrock geologic map of the Uxbridge quadrangle, Worcester County, Massachusetts, and Providence County, Rhode Island: U.S. Geological Survey Scientific Investigations Map 3295, 1 sheet, scale 1:24,000, 36-p. pamphlet, http://dx.doi.org/10.3133/sim3295. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Directory layout: |-README.TXT---ASCII text description (this file) | |---EXPORT---Folder contains Arc/Info GIS export-interchange files (e00) | Does not contain PHOTO database, see shapefile instead | |---GoogleEarth--Folder contains KMZ files of GIS data layers | |---SHAPE---Folder contains ArcGIS shapefiles & lookup table for CONTX | polygon coverage | |---BASE---Folder contains basemap image files and worldfiles | |---PHOTOS---Folder contains 348 photographs of the geology and landscape | |---SYMBOLS---Supporting files for structure symbols; used in Arc/Info ArcPlot | | | |--SIM3295.pdf---Geologic map |---WEBSITE----| | |--SIM3295P.pdf---Text pamphlet | The files | | in this | | folder are | | available | | online |--METADATA.TXT---Metadata file in ASCII text format | |--METADATA.HTML---Metadata file in HTML format ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ A subset of the contents of this readme.txt file are also included in the metadata for this report. This readme.txt, however, contains greater detail than the metadata. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ To order this and other USGS information products, visit http://store.usgs.gov or Call the U.S. Geological Survey at 1-888-ASK-USGS ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Description: The bedrock geology of the 7.5-minute Uxbridge, MA-RI quadrangle consists of deformed Neoproterozoic to early Paleozoic crystalline metamorphic and intrusive igneous rocks of the Avalon terrane. The geology was mapped during 2007-2009 at a scale of 1:24,000. The bedrock geology was mapped using standard techniques. Location information was collected with a GPS receiver (GPS model: Garmin eTrex Venture) The line and polygon data were compiled in Adobe Illustrator over the topographic basemap. Field sheets were scanned and registered in Illustrator. Topographic basemap separates were scanned at 400 dpi. Line and polygon data were exported from Illustrator in DXF format to Arc/Info version 9.2. Point data were collected with GPS and entered into Microsoft Excel. Excel data were imported to ArcGIS version 9.3 as ASCII text files and joined with GPS point data to create shapefiles. The GPS data were collected in Latitude and Longitude in degrees minutes and seconds in WGS84 datum. GPS data were projected to the Massachusetts Stateplane coordinate system (FIPS Zone 2001) in NAD83 datum, with units in meters. GPS locations were compared to the topographic basemap of the area and repositioned to match the base. The original coordinates remain in the STRUCTURE database. After editing in Arc/Info, all arcs, polygons, and points were converted to shapefiles. 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 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Date of latest GIS revision: November 17, 2011 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The GIS data associated with this report are provided in three common GIS formats. The GIS data were created in ARC/INFO version 10.0 on an Dell PC running Windows 7. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Note on Metadata: FGDC compliant metadata for the report exists in TXT and HTML formats. The HTML file was created with the mp metadata tool available from: http://geology.usgs.gov/tools/metadata/ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Digital data are in: Massachusetts Stateplane coordinate system (FIPS Zone 2001) in NAD83 datum units in meters ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Computer Files: Some files have been archived using WinZip. Useful URL: http://winzip.com ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ******************************************************************** The following is a brief description of the geologic data layers, tables, and non-standard attributes used in this report. ******************************************************************** GPS - Point data layer of GPS station locations. STATION - Number of field station LAT - Latitude in decimal degrees (WGS84) LONG - Longitude decimal degrees (WGS84) X_COORD - X coordinates in Stateplane meters Y_COORD - Y coordinates in Stateplane meters _________________________________________________________________ CONTX - Polygon data layer of bedrock geologic map units CONTX is divided into shapefiles for arcs, polygons, labels, and tic marks. Polygons - CONTX.PAT items: CODE - Bedrock geologic map unit code LITH_UNIT - same as CODE Lookup table - CONTX_LI.DBF - Bedrock lithology attribute lookup table If you are using Arc/Info you can access the data in this table using either the JOINITEM or RELATE functions and the item LITH_UNIT. This lookup table has been joined to the shapefile in ArcMap. CONTX is the Arc/INfo coverage, and includes arcs, polygons, labels, and tic marks. Alternatively, you can use the polygon shapefile where the lookup table CONTX_LI.TXT has already been joined (ux_contx_polygon.shp) Tic marks: 4 corner tic marks from Mass GIS: MassGIS is the Commonwealth's Office of Geographic and Environmental Information http://www.mass.gov/mgis/massgis.htm 1514 1515 + + + + 1414 1415 Corner tic marks from the statwide coverage of USGS 7.5-minute quadrangles. CONTX_LI.TXT items: CODE = map unit designator (same as LITH_UNIT) AGE_SORT = order to sort by age (1 = youngest) LITH_UNIT = map unit designator SURF_BED = surficial or bedrock unit LITHPRI = primary lithology in the map unit LITHSEC = secondary lithology in the map unit ZONE = Avalon zone (or terrane) GROUP = group name FORMATION = formation name MEMBER = member name ROCKCLASS = rock type AGE = geologic age of the map unit FOSSIL = Yes means the unit contains fossils outside the map area COLOR = color of unweathered rock MINPRI = most characteristic minerals Arcs - Line data layer of geologic contacts CONTX.AAT or arc shapefile Items: TYPE - fault or contact NAME - name of fault (may be blank) LINETYPE - type of faults, entries used in this database: 'strikeslip' _________________________________________________________________ EXPOSURE - Unattributed polygon data layer of bedrock outcrops examined during mapping _________________________________________________________________ STRUCTURE - Point data layer of ductile and brittle structural geology STRUCTURE.PAT items: STATION - Number of field station TYPE - Refers to the general type of geologic feature. Valid entries include 'planar', 'linear', or 'other' SUB_TYPE - Refers to the specific geologic structure 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 FRACTURE - 'Y' indicates feature is a fracture PARTING - 'Y' indicates the planar feature exhibits parting or fracturing parallel to the surface measured SYMBOL - Arc/Info symbol number THROUGHOI - 'Y' indicates the measured brittle feature is throughgoing and passes through the entire outcrop. REL_AGE - Refers to the relative age of ductile fabrics. Valid entries include: n-1 = foliation older than dominant fabric, probably S1 n = Relative age is the dominant fabric, S2 n+1 = maybe S2 or S3 n+2 = probably S3 or S4 FAULTMOV - movement sense of brittle fault Valid entries include: normal, reverse, left lateral, right lateral, thrust NO_MSMTS - Number of features with same orientation. Valid for SUB_TYPE = 'joint' and 'joint set'. TERMINATIO - Termination of joints where known valid entries include: 'blind', 'abutting', 'crossing' TOPOFEAT - Topographic feature parallel to a geologic structure. Valid entries include: 'cliff', 'valley' or 'stream' LITH - 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, or notes. SYMBOL - Refers to the symbol number from the GEOLOGY1.MRK markerset; used for plotting in Arcplot. SYMBOL_ANG - Refers to a standard Cartesian angle measured from East; used for symbol rotation and plotting in 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: -----> ROTATION - Rotation sense of minor folds as viewed down plunge. Valid entries: 'cc' = counterclockwise and 'cw' = clockwise. SPACING - Spacing of joints in joint sets, units in meters WIDTH - Width or thickness of dike or vein, units in meters MIN1 - Primary mineral MIN2 - Secondary mineral MIN3 - Tertiary mineral Note on MIN1, MIN2, and MIN3 -- The aforementioned 3 items are used to describe minerals in veins or mineral lineations. The following values from Kretz (1983) may be used: bt biotite qtz quartz ep epidote gr graphite dol dolomite plg plagioclase lm limonite sul sulfides car carbonate kfs alkali feldspar chl chlorite sil sillimanite amp amphibole hbl hornblende ms muscovite mag magnetite Kretz, R., 1983, Symbols for rock-forming minerals: American Mineralogist, v. 68, nos. 1-2, p. 277-279. Additional entries include: 'Ag' - silver 'Fe' - iron oxide stain SAMPLE - Freeform text with sample information GPS Coordinate information in LATitude and LONGitude (WGS84 datum) LAT - decimal degrees LONG - decimal degrees PLOT - 'Y' indicate symbol is plotted (may or may not be used) X_COORD - X coordinates in Stateplane meters Y_COORD - Y coordinates in Stateplane meters CODE - Map unit designator (same as LITH_UNIT); assigned with the Arc: 'Identity' command. Blank values fall outside defined polygons. Used for structural analysis. LITH_UNIT - same as CODE FOLIATION - SUB_TYPE features that are foliations, valid entries = 'Y' FORMATION - Major rock unit; used for structural analysis Valid entries include: 'Blackstone', 'Hope Valley', 'Ironstone', 'Northbridge', 'Ponaganset', and 'tonalite' ____________________________________________________________ STRUC_CAR & STRUC_BRI - Point data layers of ductile and brittle structural geology used for cartography in ArcPlot; supplied in e00 format only. Includes annotation for cartography. Data are a subset of raw data found in STRUCTURE. ____________________________________________________________ FOLDS - Line coverage of axial traces of folds FOLDS.PAT Items: FOLD_TYPE - Valid entries include: 'inferred F1 axial trace' 'F3 antiform' or 'F3 synform' PLUNGE_DIR - cardinal direction of plunge of fold ____________________________________________________________ PHOTO - Point data layer of photographs; includes landscape and outcrop photos PHOTO.PAT items: STATION - Number of field station TYPE - Valid entries include 'other' SUB_TYPE - Refers to the specific geologic feature, in this case 'photo'. PHOTO_FILE - Filename of JPG format color photograph used for ArcMAp hyperlinks Note - The PHOTO shapefile is desgined for use with the ArcMap hyperlink tool. There are 348 digital photos located in the PHOTOS directory. Users can copy the photos to the same directory as the shapefile, or copy the photos to their own folder and then specify the path: In ArcMap - File, Document Properties, Hyperlink Base ____________________________________________________________ GEOCHEM - Point data layer of whole-rock geochemistry. Rocks analyzed for major, trace, and rare earth elements (REE). Geochemical analyses were conducted by SGS Minerals, Toronto, Ontario, Canada. Major elements were analyzed by XRF using lithium metaborate fused disks (SGS Method XRF76S). Trace elements and REE were analyzed by ICP-MS using sodium peroxide fusion (SGS Method ICM90A). ************************************************************************ The following is a description of the base used in this report: The basemaps consists of: Four files as TIFF format bitmaps and worldfiles HYPSO - Hypsography - brown separate HYDRO - Surface water - blue separate CULTURE - Primary culture originally on black and red separates includes roads, buildings, etc. CULTURE2 - Secondary culture from 1979 photorevisions from purple separate TIFF format maps: Scanned black and white bitmap images in uncompressed TIFF format. Scanned at 400 dpi from a film positive of the USGS 7.5-minute Uxbridge, MA-RI topographic map (1969, photorevised 1979). Images registered to the 4 corner tics in ArcGIS. *********************************************************************** SYMBOLS Arc/Info workstation: Used for plotting structural geology symbols in point coverages. This is an older way of plotting point data, but it allows all points to be in the same coverage. Copy the fnt files to your workspace and specify a path to the mrk file in AML. geology1.mrk fnt025 fnt026 fnt035 fnt036 fnt038 fnt039 fnt040 These files are modified from the original versions of Fitzgibbon and Wentworth (1991): Fitzgibbon, T.T., and Wentworth, C.M., 1991, ALACARTE User Interface; AML code and demonstration maps: U.S. Geological Survey Open-File Report 91-587. Layer files for use in ArcMap are also provided, but the structural geology symbols were drawn in Arc/Info, not ArcMap. ux_contx_arc.lyr ux_contx_polygon.lyr ux_folds.lyr ux_geochem.lyr ux_gps.lyr ux_photos.lyr ux_structure_point.lyr ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ END