Till and bedrock of the Ashby-Lowell-Fitchburg-Billerica-Sterling 11-quadrangle area in Northeast-Central Massachusetts - till_bedrock

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Byron D. Stone
Originator: Janet R. Stone
Publication_Date: 2007
Title:
Till and bedrock of the Ashby-Lowell-Fitchburg-Billerica-Sterling 11-quadrangle area in Northeast-Central 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/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 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, bedrock outcrops, and areas of abundant outcrop and shallow bedrock for a 11-quadrangle area in northeast-central Massachusetts. Thin till and bedrock outcrops polygons are mutually exclusive; thick till polygons overlie areas of thin till, and abundant outcrop/shallow bedrock polygons overlie areas of thin till and bedrock outcrops. 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, bedrock outcrops, and areas of abundant outcrop and shallow bedrock for a 11-quadrangle area in northeast-central Massachusetts. This data layer should be used in conjunction with the overlying stratified_deposits, 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: -71.876690
East_Bounding_Coordinate: -71.248545
North_Bounding_Coordinate: 42.740377
South_Bounding_Coordinate: 42.374753
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: drumlin
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. Thin till and bedrock polygons are exclusive and do not overlap other each other. Thick till polygons overlie 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 overlie 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 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: 2954
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
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.
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: 4.976
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
Generated by mp version 2.8.6 on Wed Aug 22 16:12:26 2007