Identification_Information: Citation: Citation_Information: Originator: Gregory J. Walsh Originator: John N. Aleinikoff Originator: Michael J. Dorais Publication_Date: 2011 Title: Bedrock geologic map of the Grafton quadrangle, Worcester County, Massachusetts Edition: 1.0 Geospatial_Data_Presentation_Form: Map Series_Information: Series_Name: Scientific Investigations Map Issue_Identification: 3171 Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/sim/3171/ Other_Citation_Details: Walsh, G.J., Aleinikoff, J.N., and Dorais, M.J., 2011, Bedrock geologic map of the Grafton quadrangle, Worcester County, Massachusetts: U.S. Geological Survey Scientific Investigations Map 3171, 1 sheet, scale 1:24,000, 39-p. text. Description: Abstract: The bedrock geology of the 7.5-minute Grafton, Mass., quadrangle consists of deformed Neoproterozoic to early Paleozoic crystalline metamorphic and intrusive igneous rocks. The database includes contacts of bedrock geologic units, faults, outcrops, structural geologic information, and photographs. The digital data are intended for use by all government, academic, commercial, or other agencies in need of digital geologic map information. Purpose: 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 of Massachusetts. The digital data are intended for use by all government, academic, commercial, or other agencies in need of digital geologic map information. Supplemental_Information: Locational data were collected in latitude and longitude (degrees minutes seconds) in WGS84 datum, and 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. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2005 Ending_Date: 2011 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -71.750007 East_Bounding_Coordinate: -71.624266 North_Bounding_Coordinate: 42.250305 South_Bounding_Coordinate: 42.124892 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: geology Theme_Keyword: geologic Theme_Keyword: bedrock Theme_Keyword: geochronology Place: Place_Keyword_Thesaurus: None Place_Keyword: Massachusetts Place_Keyword: Worcester County Place_Keyword: Grafton Place_Keyword: Sutton Place_Keyword: Worcester Place_Keyword: Shrewsbury Place_Keyword: Westborough Place_Keyword: Northbridge Place_Keyword: Upton Access_Constraints: none Use_Constraints: none Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Gregory J. Walsh Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: P.O. Box 628 City: Montpelier State_or_Province: Vermont Postal_Code: 05601 Country: USA Contact_Voice_Telephone: 802-828-4528 Contact_Facsimile_Telephone: 802-828-4465 Contact_Electronic_Mail_Address: gwalsh@usgs.gov Native_Data_Set_Environment: Arc/Info coverage format Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: 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. Logical_Consistency_Report: These data are believed to be logically consistent, though no tests were performed. Geometry is topologically clean. Completeness_Report: 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. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: 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. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: 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. Lineage: Process_Step: Process_Description: Geology was mapped by Walsh 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 with a hand-held 3COM Palm Pilot III PDA computer. Data from the PDA 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. Process_Date: 2011 Source_Produced_Citation_Abbreviation: Walsh and others (2011) Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Gregory J. Walsh Contact_position: Geologist Contact_Address: Address_Type: mailing and physical address Address: P.O. Box 628 City: Montpelier State_or_Province: Vermont Postal_Code: 05601 Country: USA Contact_Voice_Telephone: 802-828-4528 Contact_Facsimile_Telephone: 802-828-4465 Contact_Electronic_Mail_Address: gwalsh@usgs.gov Hours_of_Service: 0900 to 1700 eastern standard time Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Complete chain Point_and_Vector_Object_Count: 67 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: State Plane Coordinate System 1983 State_Plane_Coordinate_System: SPCS_Zone_Identifier: 2001 Lambert_Conformal_Conic: Standard_Parallel: 41.716667 Standard_Parallel: 42.683333 Longitude_of_Central_Meridian: -71.500000 Latitude_of_Projection_Origin: 41.000000 False_Easting: 200000.000000 False_Northing: 750000.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000100 Ordinate_Resolution: 0.000100 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: The geologic data layers in the GIS database of this report include, 1) CONTACTS - Polygon and arc data layers of bedrock geologic map units, including a lithology attribute table, 2) EXPOSURE - Unattributed polygon data layer of bedrock outcrops examined in this study, 3) FOLDS - Axial traces of map scale folds, 4) PHOTOS - Field photographs of geology, 5) STRUCTURE - Point data of structural data. Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/sim/3171/Downloads/readme.txt Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - Information Services Contact_Address: Address_Type: mailing address Address: Box 25286, Denver Federal Center City: Denver State_or_Province: Colorado Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 1-888-ASK-USGS Contact_Electronic_Mail_Address: ask@usgs.gov Hours_of_Service: 0900 to 1700 mountain standard time Resource_Description: USGS Scientific Investigations Map 3171 Distribution_Liability: These data were prepared by an agency of the U.S. Government. Neither the U.S. Government, the Department of the Interior, nor the U.S. Geological Survey, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Arc/Info export Format_Version_Number: 9.3 Format_Information_Content: Geologic units and structural features File_Decompression_Technique: unzip Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/sim/3171/downloads/SIM3171B.zip Digital_Form: Digital_Transfer_Information: Format_Name: Shapefile Format_Version_Number: 1.0 Format_Information_Content: Geologic units and structural features File_Decompression_Technique: unzip Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/sim/3171/downloads/SIM3171B.zip Fees: none Metadata_Reference_Information: Metadata_Date: 20110601 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Contact_Person: Gregory J. Walsh Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: P.O. Box 628 City: Montpelier State_or_Province: VT Postal_Code: 05601 Country: USA Contact_Voice_Telephone: 802-828-4528 Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998