Bedrock geologic map of the Grafton quadrangle, Worcester County, Massachusetts

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Metadata:

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: <https://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: <https://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: <https://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: <https://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


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