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U.S. Geological Survey Open-File Report 2013–1060

Sea-Floor Geology and Topography Offshore in Northeastern Long Island Sound


Bottom Photography

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Thumbnail image of figure 30 and link to larger figure. Map of bottom photograph locations in the study area.
Figure 30. Locations of stations at which bottom photography was collected during U.S. Geological Survey cruises 2010-015-FA and 2010-010-FA to verify bathymetric data.

Sea-floor photography was collected at 21 stations within the H12012 survey area as part of this study (fig. 30). The mid-sized Seabed Observation and Sampling System (SEABOSS) aboard the OSV Bold was used to obtain video photography and three to five still photographs at each station as the vessel drifted over the seabed for 2 to 5 minutes during USGS cruise 2010-015-FA. The small Seabed Observation and Sampling System (mini-SEABOSS) aboard the R/V Rafael was used to obtain video photography at station 012-6 during USGS cruise 2010-010-FA. A total of 64 still photographs of the sea floor were obtained. The field of view of each image is approximately 50 cm wide (SEABOSS 50 cm above the bottom). There are no stations 012-2, 012-7, 012-9, and 012-12; extreme turbidity prevented still photography at station 012-6.

Low-resolution images (150 pixels wide) of the photographs may be viewed by browsing the thumbnails in the photo gallery below. These thumbnails are hyperlinked to medium-resolution images (600 pixels wide) for more detailed viewing. Alternatively, the directory containing the full-resolution images may be accessed by clicking images. These full-resolution images can be identified using the image name shown underneath the photograph in the galleries below. Textural analyses of samples obtained at these stations, where available, are provided in the Sediment Distribution section of this report. The photographs are listed by station and are preceded by a brief description.

012-1 / Scattered and patchy boulders separated by cobbles and pebble gravel. Boulders are overgrown with sessile fauna and flora including: hydroids, hydrozoans, red algae, and coral. Fish and drifting seaweed are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-1a
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012-1b
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012-1c

 

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012-1d
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012-1e

 


 

012-3 / Relatively flat-lying gravelly sand with pea and pebble gravel. Scattered and patchy mussels and mussel shell debris. Hydrozoans, sand dollar shells, cancer and hermit crabs, whelk, starfish, sand worms, and drifting kelp are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-3a
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012-3b
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012-3c

 

 

012-4 / Flat gravelly sand armored with pea and some pebble gravel. Scattered mussels and mussel shell debris, skate, starfish, cancer and hermit crabs, and drifting and attached seaweed are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-4a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-4b
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-4c

 

 

012-5 / Gravelly sand armored by pea and pebble gravel with mussels, and mussel shells and debris. Cancer and hermit crabs, starfish, skate, finfish, and hydrozoans are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-5a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-5b
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-5c

 

 

012-6 / Rippled sand. Scattered quahog, surf clam, and oyster shells are common, hermit crabs and wood fragments are present. Turbid; no photographs available.

012-8 / Rippled and megarippled sand with some pebble gravel and sediment was observed being transported. Scattered shells and shell debris are concentrated in the troughs of the bedforms. Finfish are present; barnacles grow on the gravel.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-8a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-8b
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012-8c

 

 

012-10 / Current rippled sand with scattered and patchy pebble gravel. Barnacles grow on the gravel. Scour features are present around the gravel and active transport of sand was observed. Scattered shells and shell debris are concentrated in the ripple troughs, and whelk, clay clast, cancer crabs, a lobster pot line, and attached seaweed are present.

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012-10a
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012-10b
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012-10c

 

 

012-11 / Rippled sand and exposed red clay with scattered and patchy pebble and cobble gravel. Scour features are present around the gravel. Scattered bushy hydrozoans and shell debris, whelk, seaweed, and cancer, spider, and hermit crabs are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-11a
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012-11b
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-11c

 

 

012-13 / Rippled sand with some pea gravel. Numerous shells with scattered bushy hydrozoans; cancer and spider crabs are present.

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012-13a
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012-13b
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012-13c

 

 

012-14 / Rippled and megarippled sand with some pea and pebble gravel. Bottom has a current-swept appearance and sediment was observed being transported. Scattered shells and shell debris are concentrated in the troughs of the bedforms. Hydrozoans, moon snail casings, and cancer crabs are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-14a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-14b
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-14c

 

 

012-15 / Rippled sand with pea and some pebble gravel. Bottom has a current-swept appearance. Scattered shells and shell debris are concentrated in the troughs of the ripples. Hydrozoans, skate, and finfish are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-15a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-15b
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-15c

 

 

012-16/ Gravelly sand armored with pea gravel. Scattered shells and shell debris, skate, sea robin, hermit crabs, starfish, moon snails, and drifting seaweed are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-16a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-16b
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012-16c

 

 

012-17 / Gravelly sand with scattered boulders overgrown with sessile biota, such as sponges and hydroids. Sea robin, cancer crabs, shells, and hydrozoans are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-17a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-17b
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-17c

 

 

012-18 / Pea and pebble gravel with scattered small sandy patches, hydrozoans and mussel shells and shell debris. Sea robin, starfish, finfish, and spider and hermit crabs are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-18a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-18b
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012-18c

 

 

012-19 / Rippled gravelly sand with pea gravel. Scattered shells with shell hash concentrated in the ripple troughs. Starfish, skate, drifting seaweed and squid are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-19a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-19b
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012-19c

 

 

012-20 / Rippled gravelly sand with scattered and patchy boulders overgrown with sessile fauna, such as sponges, anemone, hydroids and hydrozoans, and flora, such as kelp. Skate, lobsters, starfish, cancer crabs, and mussels are present. Mussel shells and shell debris are concentrated in the ripple troughs.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-20a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-20b
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-20c

 

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012-20d

012-21 / Gravelly sand with patches of pea and pebble gravel. Scattered mussels and mussel shell debris, whelk, hydrozoans, and drifting and attached seaweed are present. Sea floor has a current-swept appearance.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-21a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-21b
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-21c

 

 

012-22 / Gravelly sand armored with pea and some pebble gravel. Scattered mussel shells and shell debris, cancer crabs, starfish, hydrozoans, and drifting seaweed are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-22a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-22b
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-22c

 

 

012-23 / Pea and pebble gravel overlying gravelly sand. Small finfish, hydrozoans, scattered shells and shell debris, hermit crabs, and attached and drifting seaweed are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-23a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-23b
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012-23c

 

 

012-24 / Pea and pebble gravel armoring gravelly sand. Bushy hydrozoans, small finfish, starfish, mussels and scattered shells and shell debris, hermit and cancer crabs, and attached and drifting seaweed are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-24a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-24b
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-24c

 

 

012-25 / Scattered boulders separated by cobbles and pebble gravel. Boulders are overgrown with sessile fauna and flora including: hydrozoans, red algae, coral, and sponges. Anemone, attached and drifting kelp, and lobsters are present.

Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-25a
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-25b
Thumbnail of a photograph of the sea floor, click to view full scale photograh.
012-25c

 

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012-25d

 

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