Figure Captions
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Figure 1. Map
showing the location of the study area, ship tracklines and major
physiographic and geographic features.
PDF Version- Figure 1
Figure 2. Map showing sidescan-sonar
imagery of the study area with overlays showing (a)
sediment sample locations, bathymetry, and dumpsite locations, and
(b) location of figures presented in
the report. High backscatter on the sidescan-sonar imagery is represented
by light tones, low backscatter by dark tones.
PDF Version- Figure2a, Figure2b
Figure 3. Index
map showing the major regional geologic features of the study area.
PDF Version- Figure 3
Figure 4. Geologic
interpretation of the sidescan-sonar imagery of the study area.
High backscatter is represented by light tones, low backscatter
by dark tones.
PDF Version- Figure 4
Figure 5. Map
showing the southern limit of Wisconsinan glacial advance and the
positions of proglacial lakes formed in the late Pleistocene; glacial
stage 2 during the period of Laurentide ice sheet retreat (modified
from Brigham-Grette, 1988).
PDF Version- Figure 5
Figure 6. Map
showing the elevation of the coastal-plain unconformity, the erosional
surface of Upper Cretaceous to lower Tertiary strata. Also shown
are locations boreholes used to map the elevation of the unconformity
onshore.
PDF Version- Figure 6
Figure 7. Map
showing the elevation of the Holocene ravinement surface, the erosional
surface associated with the Holocene marine transgression.
PDF Version- Figure 7
Figure 8. Isopach
map showing the thickness of the Pleistocene sedimentary deposit.
PDF Version- Figure 8
Figure 9. Isopach
map showing the thickness of the Holocene sedimentary deposit.
PDF Version- Figure 9
Figure 10.
Isopach map showing the thickness of the Quaternary (Pleistocene
and Holocene) sedimentary deposit.
PDF Version- Figure 10
Figure 11.
Representative seismic-reflection profile (cruise 95007) showing
Upper Cretaceous coastal-plain strata, the overlying Quaternary
sedimentary deposit, and the New York Bight fault zone (modified
from Schwab and others, 1997b). See Figure
2b for location.
PDF Version- Figure 11
Figure 12.
Representative seismic-reflection profile (cruise 95007) shows the
coastal-plain unconformity and the overlying Quaternary sedimentary
deposits. Note the two filled channels cut into the Cretaceous coastal-plain
strata. See Figure 2b for location.
PDF Version- Figure 12
Figure 13.
Seismic-reflection profile (cruise 96004) showing possible fault
within the Hudson Shelf Valley (underlying Hudson channels R5, R6,
and R7). See Figure 2b for location.
PDF Version- Figure 13
Figure14.
Representative seismic-reflection profile (cruise 96004) across
the Hudson Shelf Valley showing reflector R4, Hudson channels R5
and R6, and Hudson channel-fill units U5 and U6. Gas associated
with units U5 and U1 is evident as areas of acoustic blanking. See
Figure 2b for location.
PDF Version- Figure 14
Figure 15.
Map showing the depth below sea level of Hudson Channel R6 (Allison
and others, 1997).
PDF Version- Figure 15
Figure 16.
Map showing the depth below sea level of Hudson Channel R5 (Allison
and others, 1997).
PDF Version- Figure 16
Figure 17.
Representative seismic-reflection profile (cruise 95007) shows the
Holocene ravinement surface (reflector R2) and an unusually strong
example of reflector R1, which separates unit U1 from the underlying
Holocene sedimentary deposit. The Holocene ravinement surface truncates
channels that are cut into the Pleistocene sedimentary deposit.
See Figure 2b for location. Profile is
not corrected for towing depth of the vehicle due to failure of
the pressure transducer.
PDF Version- Figure 17
Figure 18.
Seismic-reflection profile (cruise 98013) showing disposed dredged
material (unit U1) in the Mud Dump Site. See Figure
2b for location.
PDF Version- Figure 18
Figure 19.
Multibeam shaded relief image showing field of bedforms on the lower
Hudson Shelf Valley. Bathymetric contours are in meters. See Figure
2b for location.
PDF Version- Figure 19
Figure 20.
Multibeam swath bathymetry and backscatter perspective view looking
northwest (vertical exaggeration = 30) of high-backscatter lineaments
offshore of Long Beach. See Figure 2b
for location. High backscatter on the sidescan-sonar imagery is
represented by light tones, low backscatter by dark tones. These
backscatter patterns are thought to result from the reworking of
Pleistocene outwash deposits by oceanographic processes; they indicate
a net sediment transport to the west, with the high-backscatter
flanks facing into the predominant flow direction (Schwab and others,
1997a).
PDF Version- Figure 20
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