Bedrock geologic map of the Nashua South quadrangle, Hillsborough County, New Hampshire, and Middlesex County, Massachusetts

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Gregory J. Walsh
Originator: Richard H. Jahns
Originator: John N. Aleinikoff
Publication_Date: 2013
Title:
Bedrock geologic map of the Nashua South quadrangle, Hillsborough County, New Hampshire, and Middlesex County, Massachusetts
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Scientific Investigations Map
Issue_Identification: 3200
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Online_Linkage: <https://pubs.usgs.gov/sim/3200/>
Other_Citation_Details:
Walsh, G.J., Jahns, R.H., and Aleinikoff, J.N., 2013, Bedrock geologic map of the Nashua South quadrangle, Hillsborough County, New Hampshire, and Middlesex County, Massachusetts: U.S. Geological Survey Scientific Investigations Map 3200, 1 sheet, scale 1:24,000, 31-p. pamphlet.

Description:
Abstract:
The bedrock geology of the 7.5-minute Nashua South, NH-MA quadrangle consists of deformed Silurian to Jurassic crystalline metamorphic and intrusive igneous rocks. The database includes contacts of bedrock geologic units, faults, outcrops, structural geologic information, and photos.
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 and New Hampshire. The digital data are intended for use by all government, academic, commercial, or other agencies in need of digital geologic map information. The report contains a GIS database, large format color sheet and explanatory text pamphlet in Adobe Portable Document Format (PDF), and a readme.txt file.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 2006
Ending_Date: 2013
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -71.499512
East_Bounding_Coordinate: -71.374254
North_Bounding_Coordinate: 42.750157
South_Bounding_Coordinate: 42.625022
Keywords:
Theme:
Theme_Keyword_Thesaurus: AGI Glossary of Geology
Theme_Keyword: geology
Theme_Keyword: geologic
Theme_Keyword: bedrock
Theme_Keyword: geochronology
Theme_Keyword: SHRIMP
Theme_Keyword: zircon
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Massachusetts
Place_Keyword: New Hampshire
Place_Keyword: Hillsborough County
Place_Keyword: Middlesex County
Place_Keyword: Nashua
Place_Keyword: Hudson
Place_Keyword: Dunstable
Place_Keyword: Tyngsborough
Place_Keyword: Westford
Place_Keyword: Chelmsford
Place_Keyword: Groton
Place_Keyword: Lowell

Access_Constraints:
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.
Use_Constraints: none
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Gregory J. Walsh
Contact_Position: Research 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

Data_Set_Credit:
Walsh and others (2013). Supersedes Jahns, R.H., Willard, M.E., and White, W.S., 1959, Preliminary bedrock geologic map of the Lowell-Westford area, Massachusetts: U.S. Geological Survey Open-File Report 59-70, scale 1:31,680, 1 map.

Native_Data_Set_Environment: ArcGIS shapefile 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 base map (1:24,000 scale), 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 a USGS 7.5-minute topographic map 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.
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 mapped by Walsh in 2006, by Jahns in 1939-40 (MA) and 1951 (NH). Geochronology by Aleinikoff, 2007-08. A preliminary version of the geology of the Nashua South quadrangle was published by Jahns and others (1959). This report supersedes the Nashua South part of the 1959 report. Jahns, R.H., Willard, M.E., and White, W.S., 1959, Preliminary bedrock geologic map of the Lowell-Westford area, Massachusetts: U.S. Geological Survey Open-File Report 59-70, scale 1:31,680, 1 map. The geology was mapped during 2006 and 1939-1951. The bedrock geology was mapped using standard techniques. Location information during modern mapping was collected with a GPS receiver (GPS model: Garmin eTrex Venture). Locational data for historic data (1939-1951) was digitized by Walsh from scanned unpublished map sheets compiled by Richard Jahns. The 7.5-minute Nashua South quadrangle was formerly named the Tyngsborough quadrangle. Jahns mapped the New Hampshire part of the Tyngsborough quadrangle in 1951, and the Massachusetts part from 1939-40. Scanned copies of Jahns’ unpublished manuscript maps were obtained from the Richard Jahns Collection at the Branner Earth Sciences Library, Stanford University, Palo Alto, California. The line and polygon data were compiled in Adobe Illustrator over the topographic basemap. Field and compilation 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 9.3. Point data by Walsh were collected with GPS and a hand-held 3COM Palm Pilot III PDA computer. Data from the PDA were imported to ArcGIS version 9.3 as ASCII text files and joined with GPS point data to create shapefiles. Jahn's strike and dip data were heads-up digitized in Arc/Info. 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. Data in the Massachusetts State Plane coordinate system were re-projected to the New Hampshire State Plane coordinate system. 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.
Process_Date: 2013
Source_Produced_Citation_Abbreviation: Walsh and others (2013)
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 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: 347
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Label point
Point_and_Vector_Object_Count: 137
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 137
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 4

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) CONTAX (contacts) - Polygon and arc data layers of bedrock geologic map units, contacts, and faults, including a polygon attribute table, (2) EXPOSURE - Polygon and arc data layers of bedrock outcrops, (3) PHOTOS - Point locations and photographs of geology, and (4) STRUCTURE - Point data of structural observations.
Entity_and_Attribute_Detail_Citation: <https://pubs.usgs.gov/sim/3200/Downloads/readme.txt>
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
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 3200
Distribution_Liability:
These data were 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, product or process disclosed in this report, and represents 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 USGS in the use of this data and related materials. Reference therein to any specific commercial product, process, or related service by trade name, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ArcGIS Shapefile
Format_Version_Number: 9.3.1
Format_Information_Content: Geologic units and related features
File_Decompression_Technique: unzip
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://pubs.usgs.gov/sim/3200/Downloads/SIM3200.zip>
Digital_Form:
Digital_Transfer_Information:
Format_Name: Google Earth
Format_Version_Number: 5.2
Format_Information_Content: Geologic units and related features including a 3D model
File_Decompression_Technique: unzip
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://pubs.usgs.gov/3200/Downloads/SIM3200GE.zip>
Digital_Form:
Digital_Transfer_Information:
Format_Name: Adobe Acrobat
Format_Version_Number: 1.5
Format_Information_Content: Bedrock geologic map in 1 sheet and explanatory pamphlet
File_Decompression_Technique: none
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://pubs.usgs.gov/sim/3200/>
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20130104
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USGS
Contact_Person: Gregory J. Walsh
Contact_Position: Research 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
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998


Generated by mp version 2.9.14 on Fri Jan 04 09:57:01 2013