Gregory J. Walsh
2014
Bedrock geologic map of the Uxbridge quadrangle, Worcester County, Massachusetts, and Providence County, Rhode Island
1.0
Map
Scientific Investigations Map
3295
Reston, Virginia
U.S. Geological Survey
https://dx.doi.org/10.3133/sim3295
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, https://dx.doi.org/10.3133/sim3295.
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 database includes contacts of bedrock geologic units, faults, outcrops, structural geologic information, geochemistry data, and photos.
The bedrock geology was mapped to study the tectonic history of the area and to provide a framework for ongoing hydrogeologic characterization of the fractured bedrock. The digital data are intended for use by all government, academic, commercial, or other agencies in need of digital geologic map information.
Locational data were collected in latitude and longitude (degrees minutes seconds) in WGS84 datum. These data were reprojected to the state plane coordinate system currently in use in Massachusetts. The database is accompanied by a large format color map, an explanatory pamphlet, and a readme.txt file.
2007
2014
publication date
None planned
-71.75
-71.625
42.125
42.0
None
geology
geologic
bedrock
None
Massachusetts
Worcester County
Providence County
Rhode Island
Sutton
Douglas
Uxbridge
Northbridge
Burrillville
Although all data released in this report have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
none
U.S. Geological Survey
Gregory J. Walsh
geologist
mailing address
P.O. Box 628
Montpelier
Vermont
05601
USA
802-828-4528
802-828-4465
gwalsh@usgs.gov
Arc/Info coverage format
All attributes digitized during the creation process were verified by displaying the lines and points in the database with respect to the USGS 7.5-minute topographic map, but no formal tests were performed.
These data are believed to be logically consistent, though no tests were performed. Geometry is topologically clean.
The geologic contacts were delineated on USGS 7.5-minute topographic maps based on observations at the outcrops shown in the database. Not all outcrops within the area were identified or visited during mapping. The geologic contacts might change if additional outcrops are discovered or exposed as the natural land changes or as the result of development. The features in the database are not based on legal parcels or definitions.
The data were created on a USGS 7.5 minute topographic map at 1:24,000 scale. Therefore, the horizontal accuracy is assumed to be within National Map Accuracy Standards, with a horizontal accuracy of 45.6 feet at the 95% confidence level. Locational information in the field was provided by a Garmin eTrex Venture GPS receiver or similar.
The data were delineated on a USGS 7.5 minute topographic map at 1:24,000 scale. Therefore, the vertical accuracy is assumed to be within National Map Accuracy Standards, with a vertical accuracy of 11.9 feet at the 95% confidence level.
Geology mapped at a scale of 1:24,000. Locational information was provided by GPS receiver. The line and polygon data were first compiled in Adobe Illustrator over registered scans of field sheets using the topographic base. Film positive separates of the published topographic base map were scanned at 400 dpi and registered in ArcMap. Illustrator files were converted to DXF vector files and imported to Arc/Info version 9.3. Point data were collected with GPS and attribute data were entered into Microsoft Excel. Data from Excel were converted to tab-delimited TXT files, joined with GPS coordinate data in ArcMap, saved as a shapefile, and exported into an Arc/Info coverage where point symbols were created and plotted. Line and polygon data were edited in Arc/Info and converted to shapefiles. Shapefiles were plotted in ArcMap and exported to Illustrator. Final cartography was done in Adobe Illustrator CS4.
2010
Walsh (2014)
U.S. Geological Survey
Gregory J. Walsh
Geologist
mailing and physical address
P.O. Box 628
Montpelier
Vermont
05601
USA
802-828-4528
802-828-4465
gwalsh@usgs.gov
0900 to 1700 eastern standard time
Vector
Complete chain
122
State Plane Coordinate System 1983
2001
41.716667
42.683333
-71.500000
41.000000
200000.000000
750000.000000
coordinate pair
0.000100
0.000100
meters
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
The geologic data layers in the GIS database of this report include, 1) CONTX - Polygon and arc data layers of bedrock geologic map units, including a lithology attribute table, 2) EXPOSURE - Unattributed polygon data layer of bedrock outcrops, 3) FOLDS - Arc data layer of axial traces of major folds, 4) STRUCTURE - Point data layer of ductile and brittle structural geology, 5) PTSCARTO - Point data layers of ductile and brittle structural geology used for cartography; a subset of STRUCTURE, 6) GEOCHEM – Point data for whole-rock geochemistry, and 7) PHOTOS - Point data layers for photographs.
https://dx.doi.org/10.3133/sim3295/downloads/readme.txt
U.S. Geological Survey - Information Services
mailing address
Box 25286, Denver Federal Center
Denver
Colorado
80225
USA
1-888-ASK-USGS
ask@usgs.gov
0900 to 1700 mountain standard time
USGS Scientific Investigations Map 3295
This digital publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data or related materials. Reference herein to any specific commercial product, process, or related service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
Arc/Info export
10.0
Geologic units and structural features
unzip
https://dx.doi.org/10.3133/sim3295
Shapefile
1.0
Geologic units and structural features
unzip
https://dx.doi.org/10.3133/sim3295
Google earth
1.0
Geologic units and structural features
unzip
https://dx.doi.org/10.3133/sim3295
none
20140905
USGS
Gregory J. Walsh
Research Geologist
mailing address
P.O. Box 628
Montpelier
VT
05601
USA
802-828-4528
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998