Till and bedrock of the Worcester North-Oxford-Wrentham-Attleboro nine-quadrangle area in South-Central Massachusetts - till_bedrock

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Byron D. Stone
Originator: Janet R. Stone
Originator: Mary L. DiGiacomo-Cohen
Publication_Date: 2008
Title:
Till and bedrock of the Worcester North-Oxford-Wrentham-Attleboro nine-quadrangle area in South-Central Massachusetts - till_bedrock
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: Open-File Report
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/D>
Larger_Work_Citation:
Citation_Information:
Originator: Byron D. Stone
Originator: Janet R. Stone
Originator: Mary L. DiGiacomo-Cohen
Publication_Date: 2008
Title:
Surficial Geologic Map of the Worcester North-Oxford-Wrentham-Attleboro Nine-Quadrangle Area in South-Central Massachusetts
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2006-1260-D
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details:
DVD and web publication include 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 nine-quadrangle area in south-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 data layer, and the postglacial data layer.
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 nine-quadrangle area in south-central Massachusetts. This data layer should be used in conjunction with the overlying stratified_deposits data layer, and the postglacial data layer. This map of nine quadrangles revises previous digital surficial geologic maps (Stone and others, 1993; MassGIS, 1999) 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: 2008
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -71.876594
East_Bounding_Coordinate: -71.247513
North_Bounding_Coordinate: 42.375701
South_Bounding_Coordinate: 41.874617
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: Worcester North
Place_Keyword: Worcester South
Place_Keyword: Oxford
Place_Keyword: Uxbridge
Place_Keyword: Blackstone
Place_Keyword: Franklin
Place_Keyword: Wrentham
Place_Keyword: Pawtucket
Place_Keyword: Attleboro
Temporal:
Temporal_Keyword: Quaternary
Temporal_Keyword: Pleistocene
Access_Constraints:
None. The data are in the public domain and may be redistributed.
Use_Constraints:
No restrictions or legal prerequisites for using the data. The data are suitable for use at appropriate scale, and are 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, neither the U.S. Geological Survey nor the Commonwealth of Massachusetts makes any warranty, expressed or implied, nor assumes any legal liability or responsibility for the accuracy of these data 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 are distributed to the user, modifications made to the data by the user should be noted in the metadata. When printing these data on a map or using them 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: sheet1_worcester_north.pdf
Browse_Graphic_File_Description:
This map shows the postglacial deposits, stratified deposits, till and bedrock of the Worcester North quadrangle with a scanned topographic base at 1:24,000 scale.
Browse_Graphic_File_Type: pdf
Browse_Graphic:
Browse_Graphic_File_Name: sheet2_worcester_south.pdf
Browse_Graphic_File_Description:
This map shows the postglacial deposits, stratified deposits, till and bedrock of the Worcester South quadrangle with a scanned topographic base at 1:24,000 scale.
Browse_Graphic_File_Type: pdf
Browse_Graphic:
Browse_Graphic_File_Name: sheet3_oxford.pdf
Browse_Graphic_File_Description:
This map shows the postglacial deposits, stratified deposits, till and bedrock of the Oxford 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: sheet4_uxbridge.pdf
Browse_Graphic_File_Description:
This map shows the postglacial deposits, stratified deposits, till and bedrock of the Uxbridge 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: sheet5_blackstone.pdf
Browse_Graphic_File_Description:
This map shows the postglacial deposits, stratified deposits, till and bedrock of the Blackstone 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: sheet6_franklin.pdf
Browse_Graphic_File_Description:
This map shows the postglacial deposits, stratified deposits, till and bedrock of the Franklin 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: sheet7_wrentham.pdf
Browse_Graphic_File_Description:
This map shows the postglacial deposits, stratified deposits, till and bedrock of the Wrentham quadrangle with a scanned topographic base at 1:24,000 scale.
Browse_Graphic_File_Type: pdf
Browse_Graphic:
Browse_Graphic_File_Name: sheet8_pawtucket_attleboro.pdf
Browse_Graphic_File_Description:
This map shows the postglacial deposits, stratified deposits, till and bedrock of the Pawtucket and Attleboro quadrangles (Massachusetts portion only) 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 two 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 nine quadrangles 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 9.2.4.1420
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. Abundant outcrop/shallow bedrock polygons overlie thin till polygons and may overlie individual bedrock outcrops. 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 nine-quadrangle area, noting that edits (including additional units) may occur to this data set when it is edge-matched to surrounding quadrangles during future compilations.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The horizontal positional accuracy of these 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: Stone, B. D.
Publication_Date: 1980
Title:
Surficial geologic map of the Worcester North quadrangle and part of the Paxton quadrangle, Worcester County, Massachusetts
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: U.S. Geological Survey Miscellaneous Investigations Series Map
Issue_Identification: I-1158
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: Worcester North
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: Chute, N.E.
Publication_Date: 1949
Title:
Surficial geology of the Pawtucket quadrangle, Rhode Island-Massachusetts
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: U.S. Geological Survey Geologic Quadrangle Map
Issue_Identification: GQ-2
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: Pawtucket
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.
Originator: Haselton, G.M.
Publication_Date: 1982
Title: Unpublished field sheets for the Worcester South Quadrangle
Geospatial_Data_Presentation_Form: map
Source_Scale_Denominator: 1:24,000
Type_of_Source_Media: paper
Source_Citation_Abbreviation: Worcester South
Source_Contribution: glacial deposits
Source_Information:
Source_Citation:
Citation_Information:
Originator: Stone, B.D.
Publication_Date: 1982
Title: Unpublished field sheets for the Oxford quadrangle
Geospatial_Data_Presentation_Form: map
Source_Scale_Denominator: 1:24,000
Type_of_Source_Media: paper
Source_Citation_Abbreviation: Oxford
Source_Contribution: glacial deposits
Source_Information:
Source_Citation:
Citation_Information:
Originator: Haselton, G.M.
Originator: Fontaine, E.
Publication_Date: 1982
Title: Unpublished field sheets for the Uxbridge quadrangle
Geospatial_Data_Presentation_Form: map
Source_Scale_Denominator: 1:24,000
Type_of_Source_Media: paper
Source_Citation_Abbreviation: Uxbridge
Source_Information:
Source_Citation:
Citation_Information:
Originator: Haselton, G.M.
Originator: Fontaine, E.
Publication_Date: 1982
Title: Unpublished field sheets for the Blackstone quadrangle
Geospatial_Data_Presentation_Form: map
Source_Scale_Denominator: 1:24,000
Type_of_Source_Media: paper
Source_Citation_Abbreviation: Blackstone
Source_Information:
Source_Citation:
Citation_Information:
Originator: Stone, B.D.
Publication_Date: 1982
Title: Unpublished field sheets for the Attleboro quadrangle
Geospatial_Data_Presentation_Form: map
Source_Scale_Denominator: 1:24,000
Type_of_Source_Media: paper
Source_Citation_Abbreviation: Attleboro
Source_Information:
Source_Citation:
Citation_Information:
Originator: Stone, B.D.
Publication_Date: 1982
Title: Unpublished field sheets for the Wrentham quadrangle
Geospatial_Data_Presentation_Form: map
Source_Scale_Denominator: 1:24,000
Type_of_Source_Media: paper
Source_Citation_Abbreviation: Wrentham
Source_Information:
Source_Citation:
Citation_Information:
Originator: Shaw, C.E., Jr.
Publication_Date: 1966
Title: Unpublished geologic map of the Milford area, Massachusetts
Geospatial_Data_Presentation_Form: map
Source_Scale_Denominator: 1:24,000
Type_of_Source_Media: paper
Source_Citation_Abbreviation: Shaw bedrock
Source_Contribution:
bedrock outcrops and areas of shallow bedrock for the northern portion of the Blackstone quadrangle
Source_Information:
Source_Citation:
Citation_Information:
Originator: Barosh, P.J.
Publication_Date: 1976
Title:
Preliminary Bedrock Geologic Map of the Oxford Quadrangle, Massachusetts, Connecticut, and Rhode Island
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: OF 76-622
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 1:24,000
Type_of_Source_Media: mylar
Source_Citation_Abbreviation: Oxford bedrock
Source_Contribution:
bedrock outcrops and areas of shallow bedrock for the Oxford quadrangle
Source_Information:
Source_Citation:
Citation_Information:
Originator: Barosh, P.J.
Publication_Date: 2005
Title:
unpublished Bedrock Geologic Map of the Oxford Quadrangle, Worcester County, Massachusetts, Providence County, Rhode Island, and Windham County, Connecticut
Source_Scale_Denominator: 1:24,000
Type_of_Source_Media: paper
Source_Citation_Abbreviation: Oxford 2005 bedrock
Source_Contribution:
bedrock outcrops and areas of shallow bedrock for the Oxford quadrangle
Source_Information:
Source_Citation:
Citation_Information:
Originator: McKniff, J.M.
Publication_Date: 1964
Title:
The petrology of the southern half of the Blackstone quadrangle, Massachusetts and Rhode Island
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: Masters thesis
Publication_Information:
Publication_Place: Providence, RI
Publisher: Brown University
Source_Scale_Denominator: 1:24,000
Type_of_Source_Media: paper
Source_Citation_Abbreviation: McKniff maps
Source_Contribution:
bedrock outcrops and areas of shallow bedrock for southern half of the Blackstone quadrangle
Source_Information:
Source_Citation:
Citation_Information:
Originator: Goldmsith, R.
Publication_Date: 1977
Title:
Unpublished field maps of the Blackstone and Franklin quadrangles
Geospatial_Data_Presentation_Form: map
Source_Scale_Denominator: 1:24,000
Type_of_Source_Media: paper
Source_Citation_Abbreviation: Goldsmith bedrock
Source_Contribution:
bedrock outcrops and areas of shallow bedrock for portions of the Blackstone and Franklin quadrangle
Source_Information:
Source_Citation:
Citation_Information:
Originator: Dixon, H.R.
Publication_Date: 1977
Title:
Unpublished field maps of the Worcester South and Uxbridge quadrangles
Geospatial_Data_Presentation_Form: map
Source_Scale_Denominator: 1:24,000
Type_of_Source_Media: paper
Source_Citation_Abbreviation: Dixon maps
Source_Contribution:
bedrock outcrops and areas of shallow bedrock for portions of the Worcester South and Uxbridge quadrangle
Process_Step:
Process_Description:
Paper copies of the published surficial geologic maps for two 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: Worcester North
Source_Used_Citation_Abbreviation: Pawtucket
Process_Date: 2002
Source_Produced_Citation_Abbreviation: geotiffs for published quadrangles
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 quadrangles
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 St.
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 quadrangle were projected to Massachusetts state plane NAD83, then edited, edgematched and appended into a single layer for each geologic unit (covering all published quadrangles).
Source_Used_Citation_Abbreviation: basic unit coverages
Process_Date: 2005-2006
Source_Produced_Citation_Abbreviation: I495Spub 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, edge-matched and appended into a single layer for each geologic unit (covering all unpublished quadrangles).
Source_Used_Citation_Abbreviation: Worcester South
Source_Used_Citation_Abbreviation: Oxford
Source_Used_Citation_Abbreviation: Uxbridge
Source_Used_Citation_Abbreviation: Blackstone
Source_Used_Citation_Abbreviation: Franklin
Source_Used_Citation_Abbreviation: Wrentham
Source_Used_Citation_Abbreviation: Attleboro
Source_Used_Citation_Abbreviation: Shaw bedrock
Source_Used_Citation_Abbreviation: Oxford bedrock
Source_Used_Citation_Abbreviation: Oxford 2005 bedrock
Source_Used_Citation_Abbreviation: McKniff maps
Source_Used_Citation_Abbreviation: Goldsmith bedrock
Source_Used_Citation_Abbreviation: Dixon maps
Process_Date: 2006-2007
Source_Produced_Citation_Abbreviation: I495Sunpub 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 edge-matched, edited as needed, and appended into coverages for the nine-quadrangle area. These coverage was then egde-matched and joined with coverages for the OFR 2006-1260-A, OFR 2006-1260-B, and OFR 2006-1260-C areas to create regional coverages. The nine-quadrangle area for this "D" block was then clipped from the regional coverages. Coverages were converted to shapefile format and combined into the three final layers.
Source_Used_Citation_Abbreviation: I495Spub coverages
Source_Used_Citation_Abbreviation: I495Sunpub coverages
Process_Date: 2007-2008
Source_Produced_Citation_Abbreviation: till_bedrock
Source_Produced_Citation_Abbreviation: stratified_deposits
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: 3933
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: 0.000000
Ordinate_Resolution: 0.000000
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 to 15 feet 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 to 15 feet thick, chiefly in drumlin landforms in which till thickness commonly exceeds 100 feet (maximum recorded thickness is 230 feet). 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 to 10 feet 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/D>
Distribution_Liability:
Although this data set has been used by the U.S. Geological Survey and the Commonwealth of Massachusetts, neither the U.S. Geological Survey nor the Commonwealth of Massachusetts makes any warranty, expressed or implied, nor assumes any legal liability or responsibility for the accuracy of these data or related materials.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 3.938 MB
Technical_Prerequisites:
Users should have GIS software capable of reading or importing ESRI shapefile format.
Metadata_Reference_Information:
Metadata_Date: 20080708
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 Tue Jul 08 16:41:09 2008