Identification_Information: Citation: Citation_Information: Originator: Byron D. Stone Originator: Janet R. Stone Publication_Date: 2007 Title: Stratified deposits of the Ashby-Lowell-Fitchburg-Billerica-Sterling 11-quadrangle area in Northeast-Central Massachusetts - stratified_deposits 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/C Larger_Work_Citation: Citation_Information: Originator: Byron D. Stone Originator: Janet R. Stone Publication_Date: 2007 Title: Surficial Geologic Map of the Ashby-Lowell-Fitchburg-Billerica-Sterling 11-quadrangle area in Northeast-Central Massachusetts Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Open File Report Issue_Identification: 2006-1260C 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 stratified_deposits 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 stratified_deposits layer shows areas of glacial stratified deposits for a 11-quadrangle area in northeast-central Massachusetts. This data layer should be used in conjunction with the underlying till_bedrock data layer and the overlying 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 stratified deposits 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 stratified_deposits layer shows areas of glacial stratified deposits for a 11-quadrangle area in northeast-central Massachusetts. This data layer should be used in conjunction with the underlying till_bedrock data layer and the overlying early_postglacial and postglacial data layers. This map of 11 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: 2007 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -71.876609 East_Bounding_Coordinate: -71.248601 North_Bounding_Coordinate: 42.726876 South_Bounding_Coordinate: 42.374811 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: gravel Theme_Keyword: sand Theme_Keyword: boulders Theme_Keyword: silt Theme_Keyword: clay Theme_Keyword: coarse deposits Theme_Keyword: fine deposits Place: Place_Keyword: Massachusetts Place_Keyword: Ashby Place_Keyword: Townsend Place_Keyword: Pepperell Place_Keyword: Nashua South Place_Keyword: Lowell Place_Keyword: Fitchburg Place_Keyword: Shirley Place_Keyword: Ayer Place_Keyword: Westford Place_Keyword: Billerica Place_Keyword: Sterling 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: OFR2006-1260C_50.pdf Browse_Graphic_File_Description: SURFICIAL GEOLOGIC MAP OF THE ASHBY-LOWELL-FITCHBURG-BILLERICA-STERLING 11-QUADRANGLE AREA IN NORTHEAST-CENTRAL 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: ashby.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Ashby quadrangle (Massachusetts portion only) with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: townsend.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Townsend quadrangle (Massachusetts portion only) with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: pepperell.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Pepperell quadrangle (Massachusetts portion only) with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: nashua_south.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Nashua South quadrangle (Massachusetts portion only) with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: lowell.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Lowell quadrangle (Massachusetts portion only) with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: fitchburg.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Fitchburg quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: shirley.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Shirley quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: ayer.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Ayer quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: westford.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Westford quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: billerica.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Billerica quadrangle with a scanned topographic base at 1:24,000 scale. Browse_Graphic_File_Type: pdf Browse_Graphic: Browse_Graphic_File_Name: sterling.pdf Browse_Graphic_File_Description: This map shows the postglacial deposits, stratified deposits, till and bedrock of the Sterling 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 three 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 eight unpublished quadrangles from scanned field maps, and then joined and edge-matched the 11 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. 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 stratified-deposits units for this 11 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: Koteff, Carl Originator: Stone, B. D. Publication_Date: 1990 Title: Surficial geologic map of the Townsend quadrangle, Middlesex and Worcester Counties, Massachusetts, and Hillsborough County, New Hampshire Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-1677 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: Townsend 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: Volckmann, R.P. Publication_Date: 1973 Title: Surficial geologic map of the Pepperell quadrangle, Middlesex County, Massachusetts, and Hillsborough County, New Hampshire Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-1118 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: Pepperell 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 Ashby Quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Ashby Source_Contribution: glacial deposits Source_Information: Source_Citation: Citation_Information: Originator: Stone, B.D. Publication_Date: 1982 Title: Unpublished field sheets for the Fitchburg Quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Fitchburg Source_Contribution: glacial deposits Source_Information: Source_Citation: Citation_Information: Originator: unknown compiler Publication_Date: Unpublished Title: Unpublished compilation of the Nashua South Quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: mylar Source_Citation_Abbreviation: Nashua South Source_Information: Source_Citation: Citation_Information: Originator: unknown compiler Publication_Date: Unpublished Title: Unpublished compilation of the Lowell quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: mylar Source_Citation_Abbreviation: Lowell Source_Information: Source_Citation: Citation_Information: Originator: Stone, B.D. Publication_Date: Unpublished Title: Unpublished field sheets for the Shirley quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Shirley Source_Information: Source_Citation: Citation_Information: Originator: Jahns,R.H. Publication_Date: 1953 Title: Surficial geologic map of the Ayer quadrangle, Massachusetts Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Geologic Quadrangle Map Issue_Identification: GQ-21 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: Ayer 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: unknown compiler Publication_Date: 1982 Title: Unpublished field sheets for the Westford quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: mylar Source_Citation_Abbreviation: Westford Source_Information: Source_Citation: Citation_Information: Originator: Stone, B.D. Publication_Date: Unpublished Material Title: Unpublished compilation of the Sterling quadrangle Geospatial_Data_Presentation_Form: map Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: paper Source_Citation_Abbreviation: Sterling Source_Information: Source_Citation: Citation_Information: Originator: Holland, W.R. Publication_Date: 1980 Title: The Surficial Geology of the Billerica quadrangle, Middlesex County, Massachusetts Series_Information: Series_Name: unpublished A.M. Thesis Publication_Information: Publication_Place: Boston, MA Publisher: Boston University Source_Scale_Denominator: 1:24,000 Type_of_Source_Media: mylar Source_Citation_Abbreviation: Billerica Process_Step: Process_Description: Paper copies of the published surficial geologic maps for three 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: Townsend Source_Used_Citation_Abbreviation: Pepperell Source_Used_Citation_Abbreviation: Ayer 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: 2004 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: I495Npub 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: Ashby Source_Used_Citation_Abbreviation: Nashua South Source_Used_Citation_Abbreviation: Lowell Source_Used_Citation_Abbreviation: Fitchburg Source_Used_Citation_Abbreviation: Shirley Source_Used_Citation_Abbreviation: Westford Source_Used_Citation_Abbreviation: Billerica Source_Used_Citation_Abbreviation: Sterling Process_Date: 2006 Source_Produced_Citation_Abbreviation: I495Nunpub 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 into coverages for the 11 quad area. These coverage was then egdematched and joined with coverages for the OFR2006-1260A and OFR2006-1260B areas to create regional coverages. The 11 quad area for this "C" block was then clipped from the regional coverages. Coverages were converted to shapefile format and combined into the 4 final layers. Source_Used_Citation_Abbreviation: I495Npub coverages Source_Used_Citation_Abbreviation: I495Nunpub coverages Process_Date: 2006 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 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: 146 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: stratified_deposits 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: sd-c Enumerated_Domain_Value_Definition: glacial stratified deposits, coarse Enumerated_Domain_Value_Definition_Source: compiler Enumerated_Domain: Enumerated_Domain_Value: sd-f Enumerated_Domain_Value_Definition: glacial stratified deposits, glaciolacustrine fine Enumerated_Domain_Value_Definition_Source: compiler Attribute: Attribute_Label: MAP_UNIT Attribute_Definition: map unit Attribute_Definition_Source: compiler Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: glacial stratified deposits, coarse Enumerated_Domain_Value_Definition: GLACIAL STRATIFIED DEPOSITS - Sorted and stratified sediments composed of gravel, sand, silt, and clay (as defined in particle size diagram) deposited in layers by glacial meltwater. These sediments occur as four basic textural units-gravel deposits, sand and gravel deposits, sand deposits, and fine deposits. On this interim map, gravel, sand and gravel, and sand deposits are not differentiated and are shown as Coarse Deposits where they occur at land surface. Textural changes occur both areally and vertically, however subsurface textural variations are not shown on this interim map. Coarse deposits include: Gravel deposits composed mainly of gravel-sized particles; cobbles and boulders predominate; minor amounts of sand within gravel beds, and sand comprises few separate layers. Gravel layers generally are poorly sorted and bedding commonly is distorted and faulted due to postdepositional collapse related to melting of ice. Sand and gravel deposits composed of mixtures of gravel and sand within individual layers and as alternating layers. Sand and gravel layers generally range from 25 to 50 percent gravel particles and from 50 to 75 percent sand particles. Layers are well to poorly sorted; bedding may be distorted and faulted due to postdepositional collapse. Sand deposits composed mainly of very coarse to fine sand, commonly in well-sorted layers. Coarser layers may contain up to 25 percent gravel particles, generally granules and pebbles; finer layers may contain some very fine sand, silt, and clay. Enumerated_Domain_Value_Definition_Source: compiler Enumerated_Domain: Enumerated_Domain_Value: glacial stratified deposits, glaciolacustrine fine Enumerated_Domain_Value_Definition: GLACIAL STRATIFIED DEPOSITS - Sorted and stratified sediments composed of gravel, sand, silt, and clay (as defined in particle size diagram) deposited in layers by glacial meltwater. These sediments occur as four basic textural units-gravel deposits, sand and gravel deposits, sand deposits, and fine deposits. Fine Deposits are shown where they occur at land surface. Textural changes occur both areally and vertically, however subsurface textural variations are not shown on this interim map. Glaciolacustrine fine deposits include very fine sand, silt, and clay that occurs as well-sorted, thin layers of alternating silt and clay, or thicker layers of very fine sand and silt. Very fine sand commonly occurs at the surface and grades downward into rhythmically bedded silt and clay varves. Locally, this map unit may include areas underlain by fine sand. Enumerated_Domain_Value_Definition_Source: compiler 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/C Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 4.044 Technical_Prerequisites: Users should have GIS software capable of reading or importing ESRI shapefile format. Metadata_Reference_Information: Metadata_Date: 20070822 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