Wayne Baldwin
2013
Qfeiso: Isochron of Holocene fluvial and estuarine (Qfe) sediment thickness beneath the Massachusetts inner continental shelf between Nahant and Northern Cape Cod Bay (Esri binary grid; UTM, Zone 19N, WGS 84)
raster digital data
Open-File Report
2012-1157
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
http://pubs.usgs.gov/of/2012/1157/GIS_catalog/Stratigraphy/Qfe/Qfe_50m.zip
Pendleton, E.A.
Baldwin, W.E.
Barnhardt., W.A.
Ackerman, S.D.
Foster, D.S.
Andrews, B.D.
Schwab, W.C.
2013
Shallow Geology, Sea-floor Texture, and Physiographic Zones of the Inner Continental Shelf from Nahant to Northern Cape Cod Bay, Massachusetts
Open-File Report
2012-1157
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
<http://pubs.usgs.gov/of/2012/1157/>
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/.
This data set contains a grid representing Holocene fluvial and estuarine (Qfe) sediment thickness (in meters) 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. Qfe is the lowermost Holocene sedimentary deposit that fills the fluvial valleys incised into the surface of Qd (undifferentiated Pleistocene glacial drift).
20060804
20080507
ground condition of data used to derive the interpretation
None planned
-70.828717
-70.299030
42.347379
41.927962
General
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Woods Hole Coastal and Marine Science Center
WHCMSC
Massachusetts Office of Coastal Zone Management
CZM
Sea floor
Marine Geology
Seismic-reflection Profiles
field activity number 2006-012-FA
field activity number 2007-001-FA
field activity number 2007-002-FA
field activity number 2008-002-FA
Esri Raster Grid
EdgeTech
512i
424
Knudsen
3200
Seismic Interpretation
Geologic Framework
Holocene
Sediment thickness
interpretation
ISO 19115 Topic Category
oceans and estuaries
geoscientificInformation
General
Massachusetts Bay
Atlantic Ocean
Boston Harbor
Nahant
Boston
Hull
Boston Harbor Islands
Duxbury
Provincetown
Plymouth
Scituate
Cohasset
Manomet
Winthrop
Cape Cod Bay
None
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.
Wayne Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
U.S. Geological Survey
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
wbaldwin@usgs.gov
http://pubs.usgs.gov/of/2012/1157/GIS_catalog/Stratigraphy/Qfe/Qfe_browse.png
browse image of Esri grid representing Holocene fluvial and estuarine (Qfe) sediment thickness
png
Microsoft Windows 7.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4000
Robert N. Oldale
Jennifer Bick
1987
Maps and Seismic Profiles Showing Geology of the Inner Continental Shelf, Massachusetts Bay, Massachusetts
U.S. Geological Survey Miscellaneous Field Studies Map
MF-1923
Woods Hole, MA
U.S. Geological Survey
4 sheets
Robert N. Oldale
Charles J. O'Hara
1990
Maps Showing the Geology of the Inner Continental Shelf, Cape Cod Bay, Massachusetts
U.S. Geological Survey Miscellaneous Field Studies Map
MF-2118
Woods Hole, MA
U.S. Geological Survey
4 sheets
http://ngmdb.usgs.gov/Prodesc/proddesc_5718.htm
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.
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.
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.
The nominal resolution of the CHIRP seismic-reflection systems is 0.5 meter. The vertical resolution of the bathymetric grid used in generating the transgressive unconformity elevation is 0.5 m (referenced to NAVD88). Overall vertical accuracy is assumed to be +/- 0.5 meter.
Walter A. Barnhardt
Seth D. Ackerman
Brian D. Andrews
Wayne E. Baldwin
2010
Geophysical and Sampling Data from the Inner Continental Shelf: Duxbury to Hull, Massachusetts.
1.0
document
Open-File Report
2009-1072
Woods Hole Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
<http://pubs.usgs.gov/of/2009/1072/>
online
20060804
20070503
ground condition
Barnhardt and others, 2010
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.
Brian D. Andrews
Seth D. Ackerman
Wayne E. Baldwin
Walter A. Barnhardt
2010
Geophysical and Sampling Data from the Inner Continental Shelf: Northern Cape Cod Bay, Massachusetts
1.0
document
Open-File Report
2010-1006
Woods Hole Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
<http://pubs.usgs.gov/of/2010/1006/>
online
20070429
20080507
ground condition
Andrews and others, 2010
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.
CHIRP seismic reflection data were interpreted using Landmark SeisWorks 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-Wisconsinan 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.
2012
Wayne E. Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
U.S. Geological Survey
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
wbaldwin@usgs.gov
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'.
2012
Wayne E. Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
U.S. Geological Survey
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
wbaldwin@usgs.gov
The ArcMap (9.3.1) 'Raster Calculator' was used to set grid cells with thickness values less than 0.5 meters to null using a SETNULL expression.
2012
Wayne E. Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
U.S. Geological Survey
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
wbaldwin@usgs.gov
Raster
Grid Cell
916
859
1
Universal Transverse Mercator
19
0.999600
-69.000000
0.000000
500000.000000
0.000000
row and column
50.000000
50.000000
meters
D_WGS_1984
WGS_1984
6378137.000000
298.257224
Wayne E. Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
U.S. Geological Survey
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
wbaldwin@usgs.gov
Downloadable Data
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.
WinZip
14.5
Esri Grid
WinZip file contains an Esri Grid (and associated metadata) that defines Holocene fluvial and estuarine (Qfe) sediment thickness on the Massachusetts inner shelf between Nahant and northern Cape Cod Bay.
zip
438 KB
http://pubs.usgs.gov/of/2012/1157/GIS_catalog/Stratigraphy/Qfe/Qfe_50m.zip
http://pubs.usgs.gov/of/2012/1157/html/GIS_catalog.html
http://pubs.usgs.gov/of/2012/1157/
Data can be downloaded via the World Wide Web (WWW)
None
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.
20130702
Wayne E. Baldwin
U.S. Geological Survey
Geologist
mailing and physical address
U.S. Geological Survey
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
USA
508-548-8700 x2226
508-457-2310
wbaldwin@usgs.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
None
None
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile