Identification_Information: Citation: Citation_Information: Originator: Wayne Baldwin Publication_Date: 2013 Title: Urelev: Elevation of the late-Wisconsinan regressive unconformity beneath the Massachusetts inner continental shelf between Nahant and Northern Cape Cod Bay (Esri binary grid; UTM, Zone 19N, WGS 84) Geospatial_Data_Presentation_Form: raster 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: http://pubs.usgs.gov/of/2012/1157/GIS_catalog/Stratigraphy/Ur/surface/Ur_50m.zip 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: Woods Hole Coastal and Marine Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: 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 contains a grid representing the elevation (NAVD88) of the late-Wisconsinan regressive unconformity beneath the Massachusetts inner shelf between Nahant and northern Cape Cod Bay. 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 of data used to derive the interpretation Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -70.828717 East_Bounding_Coordinate: -70.299030 North_Bounding_Coordinate: 42.347379 South_Bounding_Coordinate: 41.927962 Keywords: Theme: Theme_Keyword_Thesaurus: General 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 Raster Grid 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: Regressive Unconformity Theme_Keyword: interpretation Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans and estuaries Theme_Keyword: geoscientificInformation Place: Place_Keyword_Thesaurus: General 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 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 eologic mapping interpretations. Because of the scale and line spacing of the source seismic profiles, not all changes in seafloor geology are captured. Horizons are inferred between seismic lines, and unit exents and thicknesses 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: http://pubs.usgs.gov/of/2012/1157/GIS_catalog/Stratigraphy/Ur/surface/Urelev_browse.png Browse_Graphic_File_Description: browse image of Esri grid representing Ur surface 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: Woods Hole, MA 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 Map Issue_Identification: MF-2118 Publication_Information: Publication_Place: Woods Hole, MA 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 regional geologic framework 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 stratigraphic units and unconformities. 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; http://pubs.usgs.gov/of/2009/1072/GIS/hyperlink_images/seisimage/DH_SeismicProfiles_metadata.html) and Andrews and others (2010; http://pubs.usgs.gov/of/2010/1006/GIS/hyperlink_images/seisimage/CCB_seismicprofiles_metadata.html) for specific seismic data aqcuisition parameters and accuracy reports. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The nominal resolution of the CHIRP seismic-reflection systems is 0.5 meter. The vertical resolution of the bathymetric grid used in generating the regressive unconformity elevation is 0.5 m (referenced to NAVD88). Overall vertical accuracy is assumed to be +/- 0.5 meter. 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: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: 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: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: 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 SeisWorksTM 2D (R5000) seismic interpretation software. Interpretation consisted of identifying and digitizing erosional unconformites 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. An isochron representing the two-way travel time between the late-Wisonsinan regressive unconformity and the Holocene transgressive unconformity horizons was computed, then sampled at a 30-meter along track interval and exported from SeisWorks as ASCII text. Awk (no version) was used to convert two-way travel times to thickness in meters using a constant seismic velocity of 1500 m/s. 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: Mass points representing the isopach computed in the previous step were imported into ArcMap (9.3.1) as point features (easting, northing, thickness) using the 'Add XY data' function, then saved as a point shapefile. The new point shapefile was used as the sole input for the ArcMap (9.3.1) Spatial Analyst Tool 'Topo to Raster' to create an interpolated grid of the isopach with a 50 meter cell size. A polygon shapefile traced around the input mass-points was used to clip the isochron grid to the limits of the interpreted area using the ArcMap (9.3.1) Spatial Analyst tool 'Extract by Mask'. 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 ArcMap (9.3.1) Spatial Analyst 'Raster Calculator' was used to set grid cells with thickness values less than 0.5 meters to null, then add the isopach grid to the Holocene transgressive unconformity DEM ('utelev') to produce a new grid representing the NAVD88 elevation of the regressive unconformity. 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 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 916 Column_Count: 859 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 19 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -69.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 50.000000 Ordinate_Resolution: 50.000000 Planar_Distance_Units: meters 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: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Resolution: 0.001 Altitude_Distance_Units: meters Altitude_Encoding_Method: Implicit coordinate Depth_System_Definition: Depth_Datum_Name: North American Vertical Datum of 1988 Depth_Resolution: 0.001 Depth_Distance_Units: meters Depth_Encoding_Method: Implicit coordinate 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: WinZip Format_Version_Number: 14.5 Format_Specification: Esri Grid Format_Information_Content: WinZip file contains an Esri Grid (and associated metadata) that defines the elevation of the late-Wisconsinan regressive unconformity beneath the Massachusetts inner shelf between Nahant and northern Cape Cod Bay. File_Decompression_Technique: zip Transfer_Size: 728 KB Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2012/1157/GIS_catalog/Stratigraphy/Ur/surface/Ur_50m.zip Network_Resource_Name: http://pubs.usgs.gov/of/2012/1157/html/GIS_catalog.html Network_Resource_Name: http://pubs.usgs.gov/of/2012/1157/ Access_Instructions: Data can be downloaded via the World Wide Web (WWW) Fees: None Technical_Prerequisites: The grid contained in the ZIP file is available as an Esri binary grid. To utilize this data, the user must have a GIS software package capable of reading an Esri binary grid. Metadata_Reference_Information: Metadata_Date: 20130702 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 Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile