Interpretation of sea-floor geologic units on the Massachusetts inner continental shelf between Nahant and Northern Cape Cod Bay (Nahant_CCB_surfgeol polygon shapefile; Geographic WGS 84)

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Wayne Baldwin
Publication_Date: 2013
Title:
Interpretation of sea-floor geologic units on the Massachusetts inner continental shelf between Nahant and Northern Cape Cod Bay (Nahant_CCB_surfgeol polygon shapefile; Geographic WGS 84)
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2012-1157
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: https://doi.org/10.3133/ofr20121157
Online_Linkage: Larger_Work_Citation:
Citation_Information:
Originator: Pendleton, E.A.
Originator: Baldwin, W.E.
Originator: Barnhardt, W.A.
Originator: Ackerman, S.D.
Originator: Foster, D.S.
Originator: Andrews, B.D.
Originator: Schwab, W.C.
Publication_Date: 2013
Title:
Shallow Geology, Sea-floor Texture, and Physiographic Zones of the Inner Continental Shelf from Nahant to Northern Cape Cod Bay, Massachusetts
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2012-1157
Publication_Information:
Publication_Place: Reston, Va
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/of/2012/1157/
Description:
Abstract:
These data are qualitatively derived interpretive polygon shapefiles and selected source raster data defining surficial geology, sediment type and distribution, and physiographic zones of the sea floor from Nahant to Northern Cape Cod Bay. Much of the geophysical data used to create the interpretive layers were collected under a cooperative agreement among the Massachusetts Office of Coastal Zone Management (CZM), the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, the National Oceanic and Atmospheric Administration (NOAA), and the U.S. Army Corps of Engineers (USACE). Initiated in 2003, the primary objective of this program is to develop regional geologic framework information for the management of coastal and marine resources. Accurate data and maps of seafloor geology are important first steps toward protecting fish habitat, delineating marine resources, and assessing environmental changes because of natural or human effects. The project is focused on the inshore waters of coastal Massachusetts. Data collected during the mapping cooperative involving the USGS have been released in a series of USGS Open-File Reports (http://woodshole.er.usgs.gov/project-pages/coastal_mass/html/current_map.html). The interpretations released in this study are for an area extending from the southern tip of Nahant to Northern Cape Cod Bay, Massachusetts. A combination of geophysical and sample data including high resolution bathymetry and lidar, acoustic-backscatter intensity, seismic-reflection profiles, bottom photographs, and sediment samples are used to create the data interpretations. Most of the nearshore geophysical and sample data (including the bottom photographs) were collected during several cruises between 2000 and 2008. More information about the cruises and the data collected can be found at the Geologic Mapping of the Seafloor Offshore of Massachusetts Web page: http://woodshole.er.usgs.gov/project-pages/coastal_mass/.
Purpose:
This data set describes sea-floor geology on the Massachusetts inner shelf between Nahant and Northern Cape Cod Bay. Polygons are used to indicate the areal distribution of sea-floor outcrop for sub-surface stratigraphic units interpreted in high-resolution seismic reflection data. These data are useful for assessing relations between geologic framework, sea-bed morphology, and sediment textural trends.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20060804
Ending_Date: 20080507
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -70.830053
East_Bounding_Coordinate: -70.154738
North_Bounding_Coordinate: 42.341199
South_Bounding_Coordinate: 41.932552
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:12bc5f5d-fb83-499d-bb11-4082d4aec266
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme_Keyword: Woods Hole Coastal and Marine Science Center
Theme_Keyword: WHCMSC
Theme_Keyword: Massachusetts Office of Coastal Zone Management
Theme_Keyword: CZM
Theme_Keyword: Sea floor
Theme_Keyword: Marine Geology
Theme_Keyword: Seismic-reflection Profiles
Theme_Keyword: field activity number 2006-012-FA
Theme_Keyword: field activity number 2007-001-FA
Theme_Keyword: field activity number 2007-002-FA
Theme_Keyword: field activity number 2008-002-FA
Theme_Keyword: Esri Polygon Shapefile
Theme_Keyword: EdgeTech
Theme_Keyword: 512i
Theme_Keyword: 424
Theme_Keyword: Knudsen
Theme_Keyword: 3200
Theme_Keyword: Seismic Interpretation
Theme_Keyword: Geologic Framework
Theme_Keyword: Surficial Geology
Theme_Keyword: interpretation
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: geoscientificinformation
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: scientific interpretation
Theme_Keyword: sea-floor characteristics
Theme_Keyword: marine geology
Theme_Keyword: geospatial datasets
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Massachusetts Bay
Place_Keyword: Atlantic Ocean
Place_Keyword: Boston Harbor
Place_Keyword: Nahant
Place_Keyword: Boston
Place_Keyword: Hull
Place_Keyword: Boston Harbor Islands
Place_Keyword: Duxbury
Place_Keyword: Provincetown
Place_Keyword: Plymouth
Place_Keyword: Scituate
Place_Keyword: Cohasset
Place_Keyword: Manomet
Place_Keyword: Winthrop
Place_Keyword: Cape Cod Bay
Stratum:
Stratum_Keyword_Thesaurus: General
Stratum_Keyword: Seafloor
Stratum_Keyword: sea floor
Access_Constraints: None
Use_Constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information. Additionally, there are limitations associated with qualitative geologic mapping interpretations. Because of the scale (polygon editing was done at scales between 1:8,000 and 1:20,000, depending on the size of the outcrop area) and line spacing of the source seismic profiles, not all changes in seafloor geology are captured. The boundaries of polygons are inferred between seismic lines, and polygon boundaries should be considered an approximation of the location of a change in geology. Further, a constant seismic velocity of 1,500 m/s was assumed for all profiles in all sediment types, which may result in inaccurate depths of stratigraphic units.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne Baldwin
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: U.S. Geological Survey
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: Browse_Graphic_File_Description:
Interpretation ofsurficial geologic units on the Massachusetts inner shelf between Nahant and northern Cape Cod Bay
Browse_Graphic_File_Type: png
Native_Data_Set_Environment:
Microsoft Windows 7.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4000
Cross_Reference:
Citation_Information:
Originator: Robert N. Oldale
Originator: Jennifer Bick
Publication_Date: 1987
Title:
Maps and seismic profiles showing geology of the inner continental shelf, Massachusetts Bay, Massachusetts
Series_Information:
Series_Name: U.S. Geological Survey Miscellaneous Field Studies Map
Issue_Identification: MF-1923
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details: 4 sheets
Cross_Reference:
Citation_Information:
Originator: Robert N. Oldale
Originator: Charles J. O'Hara
Publication_Date: 1990
Title:
Maps showing the geology of the inner continental shelf, Cape Cod Bay, Massachusetts
Series_Information:
Series_Name: U.S. Geological Survey Miscellaneous Field Studies
Issue_Identification: Map MF-2118
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details: 4 sheets
Online_Linkage: http://ngmdb.usgs.gov/Prodesc/proddesc_5718.htm
Data_Quality_Information:
Logical_Consistency_Report:
CHIRP seismic-reflection data used to interpret the surficial geology were collected during USGS Woods Hole Coastal and Marine Science Center field activities 2006-012-FA, 2007-001-FA, 2007-002-FA, and 2008-002-FA. The geologic framework interpretations in this report were correlated with previous interpretations by Oldale and Bick (1987) and Oldale and O'Hara (1990) for Massachusetts and Cape Cod bays, respectively.
Completeness_Report:
All CHIRP seismic reflection data collected during USGS Woods Hole Coastal and Marine Science Center field activities 2006-012-FA, 2007-001-FA, 2007-002-FA, and 2008-002-FA were used to interpret the surficial geologic units.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Navigational accuracy of the seismic-reflection data used for this interpretation was assumed to be ± 10 to 20 meters. Refer to seismic trackline metadata in Barnhardt and others (2010) and Andrews and others (2010) for specific seismic data aqcuisition parameters and accuracy reports. Additional navigational uncertainty in this interpretation arises from subjective digitizing of the seismic reflectors, sampling of the interpreted horizons at 30-m along track intervals prior to export from the seismic interpretation package, and heads up digitizing of the polygons defining individual areas of geologic unit outcrop. Considering these limitations, the boundaries between geologic outcrop units are consided considered to be accurate to within approximately ± 50 meters.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Walter A. Barnhardt
Originator: Seth D. Ackerman
Originator: Brian D. Andrews
Originator: Wayne E. Baldwin
Publication_Date: 2010
Title:
Geophysical and Sampling Data from the Inner Continental Shelf: Duxbury to Hull, Massachusetts.
Edition: 1.0
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2009-1072
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/of/2009/1072/
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20060804
Ending_Date: 20070503
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: Barnhardt and others, 2010
Source_Contribution:
Shallow geologic framework and surficial geology were interpreted from approximately 1920 trackline kilometers of CHIRP seismic-reflection profiles that were collected during two separate U.S. Geological Survey field activities (2006-012-FA and 2007-001-FA) . Final, post-processed profiles were used to make the interpretations. Thorough descriptions of acquisition and processing parameters for each survey are provided by Barnhardt and others (2010) in the methods section and seismic-reflection metadata.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Brian D. Andrews
Originator: Seth D. Ackerman
Originator: Wayne E. Baldwin
Originator: Walter A. Barnhardt
Publication_Date: 2010
Title:
Geophysical and Sampling Data from the Inner Continental Shelf: Northern Cape Cod Bay, Massachusetts
Edition: 1.0
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2010-1006
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/of/2010/1006/
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20070429
Ending_Date: 20080507
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: Andrews and others, 2010
Source_Contribution:
Shallow geologic framework and surficial geology were interpreted from approximately 3270 trackline kilometers of CHIRP seismic-reflection profiles that were collected during two separate U.S. Geological Survey field activities (2007-002-FA and 2008-002-FA). Final, post-processed profiles were used to make the interpretations. Thorough descriptions of acquisition and processing parameters for each survey are provided by Andrews and others (2010) in methods sections and seismic-reflection metadata.
Process_Step:
Process_Description:
CHIRP seismic reflection data were interpreted using Landmark SeisWorks 2D (R5000) seismic interpretation software. Interpretation consisted of identifying and digitizing erosional unconformities defining the boundaries between Holocene, Pleistocene, and pre-Quaternary seismic units, and digitizing the extent over which each of the defined sub-surface seismic units crops out on the seafloor. The digitized sea-floor outcrop extents for each seismic unit were sampled at a 30-meter along track interval and exported from SeisWorks as ASCII text. The resultant text file was imported into ArcMap (9.3.1) as point features (easting, northing, seismic unit) using the 'Add XY data' function, then saved as a point shapefile (UTM, Zone 19N, WGS84).
Process_Date: 2012
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne E. Baldwin
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: U.S. Geological Survey
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov
Process_Step:
Process_Description:
A polygon shapefile of the seismic-reflection survey area was created by digitizing around a polyline shapefile of the profile tracklines (file > new > shapefile in ArcCatalog 9.3.1, then editor >'create new feature' in ArcMap 9.3.1). A new attribute field named 'surf_unit' was added to the shapefile attribute table. The point shapefile containing the along track extents of seismic unit outcrop was then used to guide division of the larger survey area polygon into smaller polygons representative of individual seismic unit outcrop areas (using editor processes 'cut polygon feature', 'intersect', 'merge', and 'clip' in ArcMap 9.3.1). As each new polygon area was created, the 'surf_unit' attribute field was populated with the appropriate geologic unit label. Polygon editing was done at scales between 1:8,000 and 1:20,000, depending on the size of the outcrop area.
Process_Date: 2012
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne E. Baldwin
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: U.S. Geological Survey
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov
Process_Step:
Process_Description:
After final editing of the surficial geologic unit polygons they were exported to a geodatabase feature class and new topological rules were established (ArcCatalog 9.3.1). Topological errors, primarily overlaps and gaps, were identified and remedied using the topology toolbar in ArcMap (9.3.1).
Process_Date: 2012
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne E. Baldwin
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: U.S. Geological Survey
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov
Process_Step:
Process_Description:
The surficial geology polygon feature class was exported back to a shapefile and the 'Shape_Area' and 'Shape_Length' fields were deleted from its attribute table (ArcCatalog and ArcMap 9.3.1). XTools Pro (7.1.0) was then used to add and populate a new attribute field containing polygon area in square kilometers. Finally, the shapefile was reprojected from UTM zone 19 N, WGS 84 to GCS WGS84 using ArcToolbox.
Process_Date: 2012
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne E. Baldwin
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: U.S. Geological Survey
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov
Process_Step:
Process_Description:
Edits to the metadata were made to fix any errors that MP v 2.9.30 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). The distribution format was modified in an attempt to be more consistent with other metadata files of the same data format. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent.
Process_Date: 20151118
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description: USGS Thesaurus keywords added to the keyword section.
Process_Date: 20180720
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description: Crossref DOI link was added as the first link in the metadata.
Process_Date: 20191118
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description:
Added keywords section with USGS persistent identifier as theme keyword.
Process_Date: 20200908
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@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: 333
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000001
Longitude_Resolution: 0.000001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257224
Vertical_Coordinate_System_Definition:
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Nahant_CCB_surfgeol
Entity_Type_Definition: Surficial geologic unit
Entity_Type_Definition_Source: seismic interpretation
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:
Codeset_Domain:
Codeset_Name: Polygon
Codeset_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: surf_unit
Attribute_Definition: Surficial geologic unit
Attribute_Definition_Source: seismic interpretation
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name:
Pz/Tcp/Qt - Undifferentiated Paleozoic bedrock, Late-Cretaceous or Tertiary coastal plain deposits, or Pleistocene glacial till or coarse drift deposits
Codeset_Source: seismic interpretation
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name:
Qd - Undifferentiated Pleistocene stratified glacial drift deposits. Commonly consists of vertically laminated, roughly horizontal to broadly undulating seismic reflectors or zone of near acoustic transparency.
Codeset_Source: seismic interpretation
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name:
Qfe - Holocene fluvial and estuarine deposits. The lowermost Holocene sedimentary deposit that fills the fluvial valleys incised into the surface of Qd. The surface is generally defined by the Holocene transgressive unconformity.
Codeset_Source: seismic interpretation
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name:
Qmn - Holocene nearshore marine deposits. Post-transgressive Holocene sediment deposits that are predominantly sand with varying proportions of gravel and mud and mostly restricted to the inner shelf area.
Codeset_Source: seismic interpretation
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name:
Qmd - Holocene deepwater marine deposits. Post-transgressive Holocene sediment deposits that are predominantly muddy with varying proportions of sand and are generally confined to portions of Cape Cod Bay that are deeper than 45 m.
Codeset_Source: seismic interpretation
Attribute:
Attribute_Label: Area_SqKm
Attribute_Definition: Geologic unit outcrop area in square kilometers
Attribute_Definition_Source: seismic interpretation
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.002
Range_Domain_Maximum: 237.146
Attribute_Units_of_Measure: Square Kilometers
Overview_Description:
Entity_and_Attribute_Overview:
Five primary seismic stratigraphic units and three major erosional unconformities were interpreted and mapped within the seismic survey area. 1.) Pleistocene till/old drift (Qt), Tertiary coastal plain deposits (Tcp), and Paleozoic bedrock (Pz) - Undifferentiated pre-Wisconsinan (?) till and Pre-Quaternary units that represent the acoustic basement of seimic survey. 2.) Fluvial Unconformity (Ul) - overlies Pz/Tcp/Qt and marks the base of Qd. 3.) Pleistocene glacial drift (Qd) - Undifferentiated, stratified, glacial deposits (up to 100 m thick (3)) composed of poorly sorted material ranging from muds to boulders. Limited and variable seismic penetrartion produces vetically laminated, roughly horizontal to broadly undulating reflectors and zones of acoustic transparency. 4.) Regressive Unconformity (Ur) - Overlies Qd and marks the base of Qfe. 5.) Holocene fluvial and estuarine (Qfe) - Fluvial sands and gravels, and estuarine sands and muds (locally > 19 m thick) that fill incised fluvial valleys. Produces vertically laminated, horizontal to concave-up reflectors and zones of acoustic transparency; local indications of cut-and-fill. 6.) Transgressive Unconformity (Ur) - Marks the base of Qmd and Qmn. 7.) Holocene deepwater marine (Qmd) - Mostly muddy deposits (locally > 16 m thick) that blaket basinal Cape Cod Bay (water depths > 45 m). Generally acoustically transparent with faint, flat-lying reflectors locally. 8.) Holocene nearshore marine - Mostly sandy deposits (typically < 2 m but up to 13 m thick) that form ridges and bars along the nearshore margins (water depths < 30 m) of the survey area. Generally acoustically transparent with faint, flat-lying reflectors locally.
Entity_and_Attribute_Detail_Citation:
The seismic stratigraphic units used here as attributes for surficial geology were first described by Oldale and O'Hara (1990) and Oldale and Bick (1987). The interpretation of the surficial extent of these units have been refined in this study using the dense, high resolution, seismic surveys of Andrews and others (2010) and Barnhardt and others (2010).
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne E. Baldwin
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: U.S. Geological Survey
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov
Resource_Description: Downloadable Data
Distribution_Liability:
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Shapefile
Format_Version_Number: ArcGIS 9.3.1
Format_Specification: Esri Polygon Shapefile
Format_Information_Content:
WinZip (v. 14.5) file contains polygons that define sea-floor geology from Nahant to Northern Cape Cod Bay, MA and the associated metadata
File_Decompression_Technique: zip
Transfer_Size: 0.25
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions: Data can be downloaded via the World Wide Web (WWW)
Fees: None
Technical_Prerequisites:
These data are available in Environmental Systems Research Institute (Esri) Shapefile format. The user must have software capable of importing and processing this data type.
Metadata_Reference_Information:
Metadata_Date: 20210217
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne E. Baldwin
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: U.S. Geological Survey
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@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_Access_Constraints: None
Metadata_Use_Constraints: None

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