Identification_Information: Citation: Citation_Information: Originator: Janet R. Stone Originator: Byron D. Stone Originator: Mary L. DiGiacomo-Cohen Publication_Date: 2006 Title: Till and bedrock of the Salem Depot-Newburyport East-Wilmington-Rockport 16-quadrangle area in Northeast Massachusetts - till_bedrock Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Open File Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: This data layer is one of four data layers representing the compilation of surficial geologic materials. Online_Linkage: http://pubs.usgs.gov/of/2006/1260/B Larger_Work_Citation: Citation_Information: Originator: Janet R. Stone Originator: Byron D. Stone Originator: Mary L. DiGiacomo-Cohen Publication_Date: 2006 Title: Surficial Geologic Map of the Salem Depot-Newburyport East-Wilmington-Rockport 16-quadrangle area in Northeastern Massachusetts Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Open File Report Issue_Identification: 2006-1260B Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: DVD and web publication includes maps and text documents (pdf format) as well as GIS data layers (shapefile format). Description: Abstract: The till_bedrock data layer is part of a comprehensive study to produce a statewide digital map of the surficial geology at a 1:24,000-scale. This compilation of surficial geologic materials defines the areas of exposed bedrock, and the boundaries between glacial till, glacial stratified deposits, and overlying postglacial deposits. The till_bedrock layer shows areas of thin till, thick till, end moraine deposits, bedrock outcrops, and areas of abundant outcrop and shallow bedrock for a 16-quadrangle area in northeastern Massachusetts. Thin till and bedrock outcrops polygons are mutually exclusive; thick till polygons overlie areas of thin till, abundant outcrop/shallow bedrock polygons overlie areas of thin till and bedrock outcrops, and end moraine deposits overlie areas of thin till. This data layer should be used in conjunction with the overlying stratified_deposits, early_postglacial, and postglacial data layers. Purpose: The purpose of this study is to provide fundamental geologic data for the evaluation of natural resources, hazards, and land information within the Commonwealth of Massachusetts. The till_bedrock data layer is part of a comprehensive effort to produce a statewide digital map of the surficial geology at a 1:24,000-scale. This compilation of surficial geologic materials defines the areas of exposed bedrock, and the boundaries between glacial till, glacial stratified deposits, and overlying postglacial deposits. The till_bedrock layer shows areas of thin till, thick till, end moraine deposits, bedrock outcrops, and areas of abundant outcrop and shallow bedrock for a 16-quadrangle area in northeastern Massachusetts. This data layer should be used in conjunction with the overlying stratified_deposits, early_postglacial, and postglacial data layers. This map of 16 quadrangles revises previous digital surficial geologic maps (Stone and Beinikis, 1992, MASSGIS surficial map coverage) that were compiled on base maps at regional scales of 1:250,000. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2006 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -71.250458 East_Bounding_Coordinate: -70.563535 North_Bounding_Coordinate: 42.888080 South_Bounding_Coordinate: 42.496609 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: surficial geology Theme_Keyword: stratified materials Theme_Keyword: stratified deposits Theme_Keyword: till Theme_Keyword: bedrock Theme_Keyword: glacial deposits Theme_Keyword: outcrops Theme_Keyword: moraine Theme_Keyword: drumlin Place: Place_Keyword: Massachusetts Place_Keyword: Exeter Place_Keyword: Hampton Place_Keyword: Salem Depot Place_Keyword: Haverhill Place_Keyword: Newburyport West Place_Keyword: Newburyport East Place_Keyword: Lawrence Place_Keyword: South Groveland Place_Keyword: Georgetown Place_Keyword: Ipswich Place_Keyword: Wilmington Place_Keyword: Reading Place_Keyword: Salem Place_Keyword: Marblehead North Place_Keyword: Gloucester Place_Keyword: Rockport Temporal: Temporal_Keyword: Quaternary Temporal_Keyword: Pleistocene Access_Constraints: None. The data is in the public domain and may be redistributed. Use_Constraints: No restrictions or legal prerequisites for using the data. The data is suitable for use at appropriate scale, and is not intended for maps printed at scales with higher resolution than 1:24,000 scale (1 inch = 2,000 feet). Although this data set has been used by the U.S. Geological Survey and the Commonwealth of Massachusetts, no warranty, expressed or implied, is made by the U.S. Geological Survey or the Commonwealth of Massachusetts as to the accuracy of the data and or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey or the Commonwealth of Massachusetts in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata. When printing this data on a map or using it in a software application, analysis, or report, please acknowledge the U.S. Geological Survey as the source for this information. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Janet Stone Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: 1080 Shennecossett Rd City: Groton State_or_Province: CT Postal_Code: 06340 Contact_Voice_Telephone: 860 405-9210 Contact_Facsimile_Telephone: 860 405-9214 Contact_Electronic_Mail_Address: jrstone@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: OFR2006-1260B_50.pdf Browse_Graphic_File_Description: SURFICIAL GEOLOGIC MAP OF THE SALEM DEPOT-NEWBURYPORT EAST-WILMINGTON-ROCKPORT 16-QUADRANGLE AREA IN NORTHEAST MASSACHUSETTS: this map shows the postglacial deposits, stratified deposits, till and bedrock of the area on a shaded relief base mape at 1:50,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: salem_depot.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Salem Depot quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: haverhill.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Haverhill quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: newburyport_west.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Newburyport West and Exeter quadrangles with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: newburyport_east.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Newburyport East quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: lawrence.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Lawrence quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: south_groveland.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the South Groveland quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: georgetown.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Georgetown quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: ipswich.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Ipswich quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: wilmington.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Wilmington quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: reading.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Reading quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: salem.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Salem quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: marblehead_north.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Marblehead North quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: gloucester.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Gloucester quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: rockport.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Rockport quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: exeter_hampton.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Exeter and Hampton quadrangles at 1:24,000 scale. Note that geology is only mapped in the Massachusetts portions of the quadrangles. Only Exeter is shown on a scanned topographic base; only a very small area of the Hampton quad is shown. Browse_Graphic_File_Type: pdf Data_Set_Credit: Multiple agencies and individuals contributed to this data layer: MASSGIS scanned and georeferenced paper copies of the published surficial geologic maps for six quadrangles; the Office of the Massachusetts State Geologist vectorized the georeferenced images and compiled geologic units in order to digitally retain the original information on the published maps (Mabee and others, 2004); U.S. Geological Survey personnel compiled and digitized the basic units for ten unpublished quadrangles from scanned field maps, and then joined and edge-matched the 16 quads in order to form a seamless geologic map. Security_Information: Security_Classification: Unclassified Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Attributes have been visually checked by the compilers. Logical_Consistency_Report: Polygon features conform to the following topological rules. There are no duplicate polygons. Polygons do not self overlap. Thin till and bedrock polygons are exclusive and do not overlap other each other. Thick till polygons overly thin till polygons. Bedrock outcrop and abundant outcrop/shallow bedrock polygons are exclusive and do not overlap other each other. Polygons of abundant outcrop/shallow bedrock overly thin till polygons. No automated procedures or tests were performed to guarantee desired topology other than visual inspection. Completeness_Report: The completeness of the data reflects the feature content of the basic units chosen for this interim product for all data sources. Additional information can be found on the data sources, which may be utilized in future compilations. The layer is complete in the sense that it accurately reflects the till and bedrock units for this 16 quadrangle area, noting that edits (including additional units) may occur to this data set when it is edgematched to surrounding quadrangles during future compilations. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The horizontal positional accuracy of this data complies with the United States National Map Accuracy Standards for 1:24,000 scale maps. According to this standard, not more than 10 percent of the locations tested are to be in error by more than 1/50 inch (40 feet) measured on the publication scale of a USGS 7.5 minute topographic quadrangle map. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Richard Goldsmith Publication_Date: 2001 Title: Surficial geologic map of the Exeter quadrangle, Rockingham County, New Hampshire and Essex County, Massachusetts Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Open-file map Issue_Identification: Geo-126 Publication_Information: Publication_Place: Concord, NH Publisher: New Hampshire Department of Environmental Services Source_Scale_Denominator: 1:25,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Exeter Source_Contribution: Glacial deposits - some stratified deposits have been modified (including, but not limited to, extention beneath water bodies and postglacial deposits). Additional thick till areas were inferred from photographic image and topographic analysis. Source_Information: Source_Citation: Citation_Information: Originator: Koteff, Carl Originator: Gephart, G. D. Originator: Schaefer, J.P. Publication_Date: 1989 Title: Surficial geologic map of the Hampton 7.5 minute quadrangle, New Hampshire and Massachusetts. Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 89-430 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Hampton Source_Contribution: Glacial deposits - some stratified deposits have been modified (including, but not limited to, extention beneath water bodies and postglacial deposits). Additional thick till areas were inferred from photographic image and topographic analysis. Source_Information: Source_Citation: Citation_Information: Originator: Stone, B.D. Publication_Date: 1982 Title: Unpublished field sheets for the Salem Quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Salem Source_Contribution: glacial deposits Source_Information: Source_Citation: Citation_Information: Originator: Stone, B.D. Publication_Date: 1982 Title: Unpublished field sheets for the Haverhill Quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Haverhill Source_Contribution: glacial deposits Source_Information: Source_Citation: Citation_Information: Originator: Stone, B.D. Publication_Date: Unpublished Title: Unpublished field sheets for the Newburyport West Quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Newburyport West Source_Information: Source_Citation: Citation_Information: Originator: Stone, B.D. Publication_Date: Unpublished Title: Unpublished field sheets for the Newburyport East quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Newburyport East Source_Information: Source_Citation: Citation_Information: Originator: Castle, R.O. Publication_Date: 1958 Title: Surficial Geologic Map of the Lawrence quadrangle, Essex County, Massachusetts. Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-107 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Source_Scale_Denominator: 1:31,680 Type_of_Source_Media: paper Source_Citation_Abbreviation: Lawrence Source_Contribution: Glacial deposits - some stratified deposits have been modified (including, but not limited to, extention beneath water bodies and postglacial deposits). Additional thick till areas were inferred from photographic image and topographic analysis. Source_Information: Source_Citation: Citation_Information: Originator: Stone, B.D. Publication_Date: Unpublished Title: Unpublished field sheets for the South Groveland quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: South Groveland Source_Information: Source_Citation: Citation_Information: Originator: Cuppels, N.P. Publication_Date: 1969 Title: Surficial geologic map of the Georgetown quadrangle, Essex County, Massachusetts. Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-850 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Georgetown Source_Contribution: Glacial deposits - some stratified deposits have been modified (including, but not limited to, extention beneath water bodies and postglacial deposits). Additional thick till areas were inferred from photographic image and topographic analysis. Source_Information: Source_Citation: Citation_Information: Originator: Sammel, E.A. Publication_Date: 1963 Title: Surficial geologic map of the Ipswich quadrangle, Massachusetts. Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-189 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Ispwich Source_Contribution: Glacial deposits - some stratified deposits have been modified (including, but not limited to, extention beneath water bodies and postglacial deposits). Additional thick till areas were inferred from photographic image and topographic analysis. Source_Information: Source_Citation: Citation_Information: Originator: Castle, R.O. Publication_Date: 1959 Title: Surficial Geologic Map of the Wilmington quadrangle, Essex County, Massachusetts. Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-122 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Source_Scale_Denominator: 1:31,680 Type_of_Source_Media: paper Source_Citation_Abbreviation: Wilmington Source_Contribution: Glacial deposits - some stratified deposits have been modified (including, but not limited to, extention beneath water bodies and postglacial deposits). Additional thick till areas were inferred from photographic image and topographic analysis. Source_Information: Source_Citation: Citation_Information: Originator: Oldale, R.N. Publication_Date: 1962 Title: Surficial geologic map of the Reading quadrangle, Massachusetts. Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-168 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Reading Source_Contribution: Glacial deposits - some stratified deposits have been modified (including, but not limited to, extention beneath water bodies and postglacial deposits). Additional thick till areas were inferred from photographic image and topographic analysis. Source_Information: Source_Citation: Citation_Information: Originator: Oldale, R.N. Publication_Date: 1964 Title: Surficial geologic map of the Salem quadrangle, Massachusetts Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Scientific Investigation Map Issue_Identification: GQ-271 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Salem Source_Contribution: Glacial deposits - some stratified deposits have been modified (including, but not limited to, extention beneath water bodies and postglacial deposits). Additional thick till areas were inferred from photographic image and topographic analysis. Source_Information: Source_Citation: Citation_Information: Originator: Carnevale, M.J. Publication_Date: 1979 Title: Surficial geology of the Marblehead North Quadrangle and review of the bedrock geology. Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Cambridge, Mass Publisher: Boston College Other_Citation_Details: M.S. Thesis Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Marblehead North Source_Contribution: Glacial deposits - some stratified deposits have been modified (including, but not limited to, extention beneath water bodies and postglacial deposits). Source_Information: Source_Citation: Citation_Information: Originator: Stone, B.D. Publication_Date: 1982 Title: Unpublished field sheets for the Gloucester quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Gloucester Source_Information: Source_Citation: Citation_Information: Originator: Stone, B.D. Publication_Date: 1982 Title: Unpublished field sheets for the Rockport quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Rockport Process_Step: Process_Description: Paper copies of the published surficial geologic maps for six quadrangles were scanned at 500 dpi and georeferenced using Lat/Long coordinates (2nd order polynomial transformation). Images were projected to UTM, zone 19, NAD27. Source_Used_Citation_Abbreviation: Lawrence Source_Used_Citation_Abbreviation: Georgetown Source_Used_Citation_Abbreviation: Ipswich Source_Used_Citation_Abbreviation: Wilmington Source_Used_Citation_Abbreviation: Reading Source_Used_Citation_Abbreviation: Salem Process_Date: 2002 Source_Produced_Citation_Abbreviation: geotiffs for published quads Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Philip John Contact_Organization: MassGIS Contact_Position: GIS Analyst Contact_Address: Address_Type: mailing and physical address Address: MassGIS Address: Executive Office of Environmental Affairs Address: 251 Causeway St., Suite 500 City: Boston State_or_Province: MA Postal_Code: 02114 Contact_Voice_Telephone: (617) 626-1185 Contact_Electronic_Mail_Address: philip.john@state.ma.us Process_Step: Process_Description: The Office of the Massachusetts State Geologist vectorized the georeferenced images in order to digitally retain the original line work of the published maps (Mabee and others, 2004). Digital geologic map units were compiled and grouped into seven basic units and attributed: artificial fill, swamp deposits, floodplain alluvial deposits, glacial stratified deposits, glacial till, thick till (drumlins), and bedrock areas (outcrops and areas of shallow bedrock). Source_Used_Citation_Abbreviation: geotiffs for published quads Process_Date: 2003 Source_Produced_Citation_Abbreviation: basic unit coverages Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Stephen B. Mabee Contact_Position: State Geologist Contact_Address: Address_Type: mailing and physical address Address: Department of Geosciences Address: University of Massachusetts Address: 611 North Pleasant Street City: Amherst State_or_Province: MA Postal_Code: 01003 Contact_Voice_Telephone: (413) 545-4814 Contact_Facsimile_Telephone: (413) 545-1200 Contact_Electronic_Mail_Address: sbmabee@eclogite.geo.umass.edu Process_Step: Process_Description: Basic unit coverages for each layer in each quad were projected to Mass stateplane NAD83, then edited, edgematched and appended into a single layer for each geologic unit (covering all published quads). Source_Used_Citation_Abbreviation: basic unit coverages Process_Date: 2005-2006 Source_Produced_Citation_Abbreviation: NEpub coverages Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Mary DiGiacomo-Cohen Contact_Organization: USGS Contact_Address: Address_Type: mailing and physical address Address: 1080 Shennecossett Rd City: Groton State_or_Province: CT Postal_Code: 06340 Contact_Voice_Telephone: 860 405-9210 Contact_Facsimile_Telephone: 860 405-9214 Contact_Electronic_Mail_Address: mdicohen@usgs.gov Process_Step: Process_Description: Unpublished field sheets were scanned and georeferenced. Geologic units were vectorized or created (on screen digiziting). Basic unit coverages for each layer in each quad were edited, edgematched and appended into a single layer for each geologic unit (covering all unpublished quads). Source_Used_Citation_Abbreviation: Exeter Source_Used_Citation_Abbreviation: Hampton Source_Used_Citation_Abbreviation: Salem Depot Source_Used_Citation_Abbreviation: Haverhill Source_Used_Citation_Abbreviation: Newburyport West Source_Used_Citation_Abbreviation: Newburyport East Source_Used_Citation_Abbreviation: South Groveland Source_Used_Citation_Abbreviation: Marblehead North Source_Used_Citation_Abbreviation: Gloucester Source_Used_Citation_Abbreviation: Rockport Process_Date: 2006 Source_Produced_Citation_Abbreviation: NEunpub coverages Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Mary DiGiacomo-Cohen Contact_Organization: USGS Contact_Address: Address_Type: mailing address Address: 1080 Shennecossett Rd City: Groton State_or_Province: CT Postal_Code: 06340 Contact_Voice_Telephone: 860 405-9210 Contact_Facsimile_Telephone: 860 405-9214 Contact_Electronic_Mail_Address: mdicohen@usgs.gov Process_Step: Process_Description: Basic unit coverages for unpublished and published areas were edgematched, edited as needed and appended. Units were converted to shapefile format and combined into the 4 final layers and reattributed for consistency. Source_Used_Citation_Abbreviation: NEpub coverages Source_Used_Citation_Abbreviation: NEunpub coverages Process_Date: 2006 Source_Produced_Citation_Abbreviation: till_bedrock Source_Produced_Citation_Abbreviation: till_bedrock Source_Produced_Citation_Abbreviation: stratified_deposits Source_Produced_Citation_Abbreviation: early_postglacial Source_Produced_Citation_Abbreviation: postglacial Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Mary DiGiacomo-Cohen Contact_Organization: USGS Contact_Address: Address_Type: mailing address Address: 1080 Shennecossett Rd City: Groton State_or_Province: CT Postal_Code: 06340 Contact_Voice_Telephone: 860 405-9210 Contact_Facsimile_Telephone: 860 405-9214 Contact_Electronic_Mail_Address: mdicohen@usgs.gov Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: C:\DOCUME~1\bstone\LOCALS~1\Temp\xml16.tmp Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 5876 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: 0.000128 Ordinate_Resolution: 0.000128 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: Detailed_Description: Entity_Type: Entity_Type_Label: till_bedrock Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: AREA Attribute: Attribute_Label: PERIMETER Attribute: Attribute_Label: legend Attribute_Definition: map unit label Attribute_Definition_Source: compiler Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: t Enumerated_Domain_Value_Definition: thin till Enumerated_Domain: Enumerated_Domain_Value: tt Enumerated_Domain_Value_Definition: thick till Enumerated_Domain: Enumerated_Domain_Value: bk Enumerated_Domain_Value_Definition: bedrock outcrops Enumerated_Domain: Enumerated_Domain_Value: sb Enumerated_Domain_Value_Definition: areas of abundant outcrop and shallow bedrock Enumerated_Domain: Enumerated_Domain_Value: em Enumerated_Domain_Value_Definition: end moraine deposits Attribute: Attribute_Label: map_unit Attribute_Definition: map unit Attribute_Definition_Source: compiler Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: thin till Enumerated_Domain_Value_Definition: Nonsorted, nonstratified matrix of sand, some silt, and little clay containing scattered gravel clasts and few large boulders; in areas where till is generally less than 10-15 ft thick and including areas of bedrock outcrop where till is absent. Predominantly upper till of the last glaciation; loose to moderately compact, generally sandy, commonly stony. Two facies are present in some places; a looser, coarser-grained ablation facies, melted out from supraglacial position; and an underlying more compact, finer-grained lodgement facies deposited subglacially. In general, both ablation and lodgement facies of upper till derived from fine-grained bedrock are finer grained, more compact, less stony and have fewer surface boulders than upper till derived from coarser grained crystalline rocks. Fine-grained bedrock sources include the red Mesozoic sedimentary rocks of the Connecticut River lowland, marble in the western river valleys, and fine-grained schists in upland areas. Enumerated_Domain: Enumerated_Domain_Value: thick till Enumerated_Domain_Value_Definition: Nonsorted, nonstratified matrix of sand, some silt, and little clay containing scattered gravel clasts and few large boulders at the surface; in the shallow subsurface, compact, nonsorted matrix of silt, very fine sand, and some clay containing scattered small gravel clasts in areas where till is greater than 10-15 ft thick, chiefly in drumlin landforms in which till thickness commonly exceeds 100 ft (maximum recorded thickness is 230 ft). Although upper till is the surface deposit, the lower till constitutes the bulk of the material in these areas. Lower till is moderately to very compact, and is commonly finer-grained and less stony than upper till. An oxidized zone, the lower part of a soil profile formed during a period of interglacial weathering, is generally present in the upper part of the lower till. This zone commonly shows closely-spaced joints that are stained with iron and manganese oxides. Enumerated_Domain: Enumerated_Domain_Value: bedrock outcrops Enumerated_Domain_Value_Definition: extent of individual bedrock outcrops Enumerated_Domain: Enumerated_Domain_Value: areas of abundant outcrop and shallow bedrock Enumerated_Domain_Value_Definition: Areas of shallow bedrock or areas where small outcrops are too numerous to map individually; in areas of shallow bedrock surficial materials are less than 5 - 10 ft thick. Enumerated_Domain: Enumerated_Domain_Value: end moraine deposits Enumerated_Domain_Value_Definition: Composed predominantly of boulders and ablation facies sandy upper till; lenses of stratified sand and gravel occur locally within the till. Surface boulders on end moraine deposits are generally more numerous than on adjacent till surfaces; dense concentrations of boulders are present in some places. Deposits occur as free-standing hummocky landforms, commonly in ridges that trend NE SW, and range in thickness from 10 to 60 ft. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Resource_Description: Downloadable Data: http://pubs.usgs.gov/of/2006/1260/B Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 7.181 Technical_Prerequisites: Users should have GIS software capable of reading or importing ESRI shapefile format. Metadata_Reference_Information: Metadata_Date: 20070410 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Mary DiGiacomo-Cohen Contact_Address: Address_Type: mailing and physical address Address: 1080 Shennecossett Rd City: Groton State_or_Province: CT Postal_Code: 06340 Contact_Voice_Telephone: 860 405-9210 Contact_Electronic_Mail_Address: mdicohen@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile