Denny, Jane F. , 2002, Gas mapped within Holocene unit, u1: Hudson Shelf Valley: US Geological Survey, Woods Hole, MA.This is part of the following larger work.
Schwab, William C., Denny, Jane F., Foster, David S., Lotto, Linda L., Allison, Mead A., Uchupi, Elazar, Swift, B. Ann, Danforth, William W., Thieler, Robert E., and Butman, Bradford, 2002, High-Resolution Quaternary seismic stratigraphy of the New York Bight Continental Shelf: Open-File Report OFR02-152, U.S. Geological Survey, Woods Hole, MA.
This is a vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000089992. Longitudes are given to the nearest 0.000089992. Latitude and longitude values are specified in decimal degrees.
The horizontal datum used is WGS84.
The ellipsoid used is WGS84.
The semi-major axis of the ellipsoid used is 6378137.0000000.
The flattening of the ellipsoid used is 1/298.26.
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
In 1995, the U.S. Geological Survey (USGS), in cooperation with the U.S. Army Corps of Engineers (USACE), began a program to generate reconnaissance maps of the sea floor offshore of the New York - New Jersey metropolitan area and within the southern Long Island nearshoe area. Our methods include high-resolution sidescan sonar and subbottom profiling techniques, along with surface grab and vibracore sampling to verify the geophysical interpretations. The goal of the investigation is to provide a regional synthesis of the sea-floor environment, to determine regional-scale availability of sand as a resource for beach nourishment programs, and to investigate the role that inner-shelf morphology and geologic framework have in the evolution of the coastal region within the New York Bight Apex and southern Long Island. Maps derived from interpretation of the subbottom profiles show information on the geometry and distribution of the Quaternary sediments and the underlying coastal-plain unconformity. This seismic stratigraphy yields a regional framework on which explanations of present (and past) sediment movement, dispersal, and erosion processes are based.
Allison, M.A., Lotto, L.L, Brink, Buchholtz ten , and Schwab, W.C., 1997, Formation and geologic evolution of the Hudson Shelf Valley, New York Bight(abstract):: Geological Society of America, Abstracts with Programs vol.29, p.27, Geological Society of America, Unknown.
Lanier, D.L, Allison, M.A., Schwab, W.C., Thieler, E.R., and Butman, B., 1999, Effects of Holocene transgression on the stratigraphy of the NY Bight inner continental shelf: American Geophysical Union, Ocean Sciences Meeting Supplement OS203, unknown, unknown.
Lotto, L.L, 2000, Seismic stratigrpahy and Quaternary evolution of the New York Bight inner continental shelf: Texas A&M University, unpublished M.S. Thesis, College Station, TX, 79p and 16 sheets.: Masters of Science Thesis unknown, Texas A&M University, College Station, Texas.
Lanier, D.L, and Allison, M.A., 2002, rednew: MapInfo vector file MapInfo vector file.
Lanier, D.L., and Allison, M.A., 2002, bluenew: MapInfo vector data MapInfo vector data.
gas_u1.shp
Person who carried out this activity:
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
These data are derived from 2D seismic reflection profiles that are spaced approximately 1.3 km apart in the cross track-direction. Shore perpendicular track lines were spaced about 3-4 km apart. Along track samples of the seismic profiles are approximately 1 meter assuming a ship speed of 2 meters/second. The data were downsampled in the along-track direction at an interval of about 30 meters.
DGPS is assumed to be accurate within 1-2 meters. Standard GPS is assumed accurate within 5-10 meters. 99% of the positional data is DGPS. Unless noted, all GPS/DGPS data is referenced to WGS84 (NAD83). The horizontal positioning did not account for source and receiver offsets and offset the GPS antennae and the boomer source and streamer. It is estimated that these offsets could lead to inaccuracies of about 30 m.
Vertical positioning accuracy of the offshore data is based on the seafloor reference used.
complete
The Pleistocene channels and gas and structure found within these channels, were mapped by Allison(1997) and Lanier(1999).
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints: none
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
gas and clinoform definition, HSV
Altough this data set and its lineage have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or it's related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related items. Users must assume responsibility for the proper use of this data. This data should not be used at resolutions for which it is not intended. This data has no been reviewed for conformity with US Geological Survey editorial standards, or the North American Strigraphic code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the US Government.
Jane F. Denny
US Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA
508-457-2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov