Identification_Information: Citation: Citation_Information: Originator: Janet R. Stone Originator: Byron D. Stone Publication_Date: 2006 Title: Postglacial deposits of the Clinton-Concord-Grafton-Medfield 12 quad area in East Central Massachusetts - postglacial 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 three data layers representing the compilation of surficial geologic materials. Online_Linkage: http://pubs.usgs.gov/of/2006/1260/A Larger_Work_Citation: Citation_Information: Originator: Janet R. Stone Originator: Byron D. Stone Publication_Date: 2006 Title: Surficial Geologic Map of the Clinton-Concord-Grafton-Medfield 12-quadrangle area in East Central Massachusetts Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Open File Report Issue_Identification: 2006-1260-A 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 postglacial 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 postglacial layer shows areas of swamp deposits, floodplain alluvium, and artificial fill for a 12-quadrangle area in east-central Massachusetts. Swamp and alluvium polygons are mutually exclusive; artificial fill polygons may overlie areas of swamp or alluvium. This data layer should be used in conjunction with the underlying till_bedrock and stratified_deposits 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 postglacial 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 postglacial layer shows areas of swamp deposits, floodplain alluvium, and artificial fill for a 12-quadrangle area in east-central Massachusetts. This data layer should be used in conjunction with the underlying till_bedrock and stratified_deposits data layers. This map of 12 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: -71.750740 East_Bounding_Coordinate: -71.248016 North_Bounding_Coordinate: 42.500348 South_Bounding_Coordinate: 42.124825 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: alluvium Theme_Keyword: swamp deposits Theme_Keyword: artificial fill Place: Place_Keyword: Massachusetts Place_Keyword: Clinton Place_Keyword: Hudson Place_Keyword: Maynard Place_Keyword: Concord Place_Keyword: Shrewsbury Place_Keyword: Marlborough Place_Keyword: Framingham Place_Keyword: Natick Place_Keyword: Grafton Place_Keyword: Milford Place_Keyword: Holliston Place_Keyword: Medfield Temporal: Temporal_Keyword: Quaternary 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 greater or more detailed 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: OFR2006-1260A_50.pdf Browse_Graphic_File_Description: SURFICIAL GEOLOGIC MAP OF THE CLINTON-CONCORD-GRAFTON-MEDFIELD: this map shows the postglacial deposits, stratified deposits, till and bedrock of the 12-quadrangle area on a shaded relief base mape at 1:50,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: clinton.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Clinton quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: hudson.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Hudson quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: maynard.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Maynard quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: concord.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Concord quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: shrewsbury.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Shrewsbury quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: marlborough.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Marlborough quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: framingham.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Framingham quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: natick.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Natick quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: grafton.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Grafton quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: milford.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Milford quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: holliston.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Holliston quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: medfield.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Medfield quadrangle with a scanned topographic base at 1:24,000 scale. 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 nine 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 three unpublished quadrangles from scanned field maps, and then joined and edge-matched the 12 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: Logical_Consistency_Report: Polygon features conform to the following topological rules. There are no duplicate polygons. Polygons do not self overlap. Swamp deposits and floodplain alluvium polygons are exclusive and do not overlap other each other. Artificial fill polygons may overlie swamp or alluvium 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 postglacial units for this 12 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: Carl Koteff Publication_Date: 1966 Title: Surficial geologic map of the Clinton quadrangle, Worcester County, Massachusetts Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-567 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Drumlins and other areas of thick till were not shown as a map unit. The areas of thick till shown on this data layer were inferred from topographic analysis and drumlin symbols shown by Koteff 1966. Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Clinton Source_Contribution: glacial stratified drift deposits Source_Information: Source_Citation: Citation_Information: Originator: Hansen, W.R. Publication_Date: 1956 Title: Geology and Mineral Resources of the Hudson and Maynard quadrangles, Massachusetts, Plate 2, Map showing surficial geology of the Hudson and Maynard quadrangles Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Bulletin Issue_Identification: 1038 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: Hudson-Maynard Source_Contribution: glacial stratified deposits and drumlin till Source_Information: Source_Citation: Citation_Information: Originator: Carl Koteff Publication_Date: 1964 Title: Surficial geology of the Concord quadrangle, Middlesex County, Massachusetts Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-331 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Drumlins and other areas of thick till were not shown as a map unit. Thick till areas shown on this data layer were inferred from topographic analysis and drumlin symbols shown by Koteff 1964 Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Concord Source_Contribution: glacial stratified drift deposits Source_Information: Source_Citation: Citation_Information: Originator: Shaw, C. E. Publication_Date: 1969 Title: Surficial geologic map of the Shrewsbury quadrangle, Worcester County, Massachusetts Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-794 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Drumlins and other areas of thick till were not shown as a map unit. Thick till areas shown on this data layer were inferred from topographic analysis and drumlin symbols shown by Shaw 1969. Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Shrewsbury Source_Contribution: glacial stratified drift deposits Source_Information: Source_Citation: Citation_Information: Originator: Stone, B.D. Publication_Date: Unpublished Title: Unpublished field sheets for the Marlborough Quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Marlborough field sheets Source_Information: Source_Citation: Citation_Information: Originator: Hildreth, C.T. Originator: Stone, B.D. Publication_Date: Unpublished Material Title: Surficial geologic map of the Marlborough quadrangle Geospatial_Data_Presentation_Form: map Publication_Information: Publisher: U.S. Geological Survey Other_Citation_Details: in prep Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: disc Source_Citation_Abbreviation: Marlborough geologic quad Source_Information: Source_Citation: Citation_Information: Originator: Nelson, A.E Publication_Date: 1974 Title: Surficial geologic map of the Framingham quadrangle, Middlesex and Worcester Counties, Massachusetts Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-1176 Publication_Information: Publication_Place: Reston,VA Publisher: U.S. Geological Survey Other_Citation_Details: Drumlins and other areas of thick till were not shown as a map unit. Thick till areas shown on this data layer were inferred from topographic analysis and drumlin symbols shown by Nelson 1974. Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Framingham Source_Contribution: stratified deposits Source_Information: Source_Citation: Citation_Information: Originator: Nelson, A.E. Publication_Date: 1974 Title: Surficial geologic map of the Natick quadrangle, Middlesex and Norfolk Counties, Massachusetts Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-1151 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Drumlins and other areas of thick till were not shown as a map unit. Thick till areas shown on this data layer were inferred from topographic analysis and drumlin symbols shown by Nelson 1974. Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Natick Source_Information: Source_Citation: Citation_Information: Originator: Haselton, G Publication_Date: Unpublished Material Title: Grafton unpublished field sheets Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Grafton Source_Information: Source_Citation: Citation_Information: Originator: Walsh, G. W. Publication_Date: Unknown Title: Bedrock Geologic Map of the Grafton quadrangle Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Scientific Investigation Map Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: in prep Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: disc Source_Citation_Abbreviation: Grafton bedrock Source_Contribution: shapefile of bedrock outcrops and shallow bedrock areas Source_Information: Source_Citation: Citation_Information: Originator: Haselton, G. Publication_Date: Unpublished Material Title: Milford unpublished field sheets Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Milford Source_Information: Source_Citation: Citation_Information: Originator: Volckman, R.K. Publication_Date: 1975 Title: Surficial geologic map of the Holliston quadrangle, Middlesex, Norfolk, and Worcester Counties, Massachusetts Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-1217 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Drumlins and other areas of thick till were not shown as a map unit. Thick till areas shown on this data layer were inferred from topographic analysis and drumlin symbols shown by Volckman 1975. Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Holliston Source_Information: Source_Citation: Citation_Information: Originator: Volckman, R.K. Publication_Date: 1975 Title: Surficial geologic map of the Medfield quadrangle, Norfolk, and Middlesex Counties, Massachusetts Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-1218 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Drumlins and other areas of thick till were not shown as a map unit on the map. Thick till areas shown on this data layer were inferred from topographic analysis and drumlin symbols shown by Volckman 1975. Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Medfield Process_Step: Process_Description: Paper copies of the published surficial geologic maps for nine quadrangles, as well as clean topographic maps for all 12 quads, were scanned at 500 dpi and georeferenced using Lat/Long coordinates (2nd order polynomial transformation, RMS errors range from 1.9 to 6.3 - with all but a few being less than 3.0 ). Images were projected to UTM, zone 19, NAD27. Source_Used_Citation_Abbreviation: Clinton Source_Used_Citation_Abbreviation: Hudson-Maynard Source_Used_Citation_Abbreviation: Concord Source_Used_Citation_Abbreviation: Shrewsbury Source_Used_Citation_Abbreviation: Framingham Source_Used_Citation_Abbreviation: Natick Source_Used_Citation_Abbreviation: Holliston Source_Used_Citation_Abbreviation: Medfield 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 shapefiles 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 shapefiles for each layer and each quad were edited, edgematched and appended into a single layer for each geologic unit (covering all 12 quads). Source_Used_Citation_Abbreviation: basic unit shapefiles Process_Date: 2003-2004 Source_Produced_Citation_Abbreviation: 12q seamless shapefiles Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Janet Stone 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: jrstone@usgs.gov Process_Step: Process_Description: shapefiles were projected to Mass stateplane NAD83, additional edits as were completed (Grafton bedrock outcrops were added and modified), shapefiles were combined into the 3 final layers and reattributed for consistency. Source_Used_Citation_Abbreviation: 12q seamless shapefiles Process_Date: 2005 Source_Produced_Citation_Abbreviation: till_bedrock Source_Produced_Citation_Abbreviation: postglacial Source_Produced_Citation_Abbreviation: stratified_deposits 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 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: 3567 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: 0.000064 Ordinate_Resolution: 0.000064 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: postglacial 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: al Enumerated_Domain_Value_Definition: floodplain alluvium Enumerated_Domain: Enumerated_Domain_Value: af Enumerated_Domain_Value_Definition: artificial fill Enumerated_Domain: Enumerated_Domain_Value: sw Enumerated_Domain_Value_Definition: swamp deposits Attribute: Attribute_Label: MAP_UNIT Attribute_Definition: map unit Attribute_Definition_Source: compiler Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: floodplain alluvium Enumerated_Domain_Value_Definition: Sand, gravel, silt, and some organic material, stratified and well sorted to poorly sorted, beneath the floodplains of modern streams. The texture of alluvium commonly varies over short distances both laterally and vertically, and generally is similar to the texture of adjacent glacial deposits. Along smaller streams, alluvium is commonly less than 5 ft thick. The most extensive deposit of alluvium on the map is along the Charles, Assabet, and Concord Rivers where the texture is predominantly sand, fine gravel, and silt, and total thickness is as much as 25 ft thick. Alluvium typically overlies thicker glacial stratified deposits. Enumerated_Domain: Enumerated_Domain_Value: artificial fill Enumerated_Domain_Value_Definition: Earth materials and manmade materials that have been artificially emplaced, primarily in highway and railroad embankments, and in dams. Enumerated_Domain: Enumerated_Domain_Value: swamp deposits Enumerated_Domain_Value_Definition: Organic muck and peat that contain minor amounts of sand, silt, and clay, stratified and poorly sorted, in kettle depressions or poorly drained areas. Most swamp deposits are less than about 10 ft thick. Swamp deposits overlie glacial deposits or bedrock. They locally overlie glacial till even where they occur within glacial meltwater deposits. Distribution_Information: Resource_Description: Downloadable Data Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 6.675 Metadata_Reference_Information: Metadata_Date: 20070119 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 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