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Filter Total Items: 1739
Erosional channels on the shoreface of Nauset Beach, Cape Cod, Massachusetts Erosional channels on the shoreface of Nauset Beach, Cape Cod, Massachusetts
Many channels (1 to 3 m relief)_are located offshore of Nauset Beach, Cape Cod, Massachusetts, in water 4 to 18 m deep. The channels are oblique to the shoreline, are spaced approximately 260 m apart, and deepen seaward. The southern flank of each channel is rippled whereas the northern flank and interchannel areas are smooth. The origin of the channels is unknown. They probably formed...
Authors
S. W. Needell, William P. Dillon, H.J. Knebel
Current-induced sediment movement in the deep Florida Straits: Observations Current-induced sediment movement in the deep Florida Straits: Observations
No abstract available
Authors
Mark Wimbush, Laszlo Nemeth, Barton Birdsall
Morphology, distribution, and development of submarine canyons on the United States Atlantic continental slope between Hudson and Baltimore Canyons Morphology, distribution, and development of submarine canyons on the United States Atlantic continental slope between Hudson and Baltimore Canyons
The distribution and morphology of submarine canyons off the eastern United States between Hudson and Baltimore Canyons have been mapped by long-range sidescan sonar. In this area canyons are numerous, and their spacing correlates with overall slope gradient; they are absent where the gradient is less than 3°, are 2 to 10 km apart where the gradient is 3° to 5°, and are 1.5 to 4 km apart...
Authors
David C. Twichell, David G. Roberts
Stratigraphy, structure, absolute age, and paleontology of the upper Pleistocene deposits at Sankaty Head, Nantucket Island, Massachusetts Stratigraphy, structure, absolute age, and paleontology of the upper Pleistocene deposits at Sankaty Head, Nantucket Island, Massachusetts
The Sankaty Head cliff exposes drift of at least two glaciations and interglacial marine deposits. Radiocarbon, amino-acid- racemization, and uranium-thorium analyses were used to determine the absolute ages of the beds. The results indicate that 1) the Sankaty Sand correlates with oxygen-isotope stage 5 (Sangamonian), 2) the underlying drift is older than stage 5 (Illinoian or older)...
Authors
Robert N. Oldale, Page C. Valentine, T. M. Cronin, E.C. Spiker, B. W. Blackwelder, D. F. Belknap, J.F. Wehmiller, Barney J. Szabo
MRNIDX - Marine Data Index: Database Description, Operation, Retrieval, and Display MRNIDX - Marine Data Index: Database Description, Operation, Retrieval, and Display
A database referencing the location and content of data stored on magnetic medium was designed to assist in the indexing of time-series and spatially dependent marine geophysical data collected or processed by the U. S. Geological Survey. The database was designed and created for input to the Geologic Retrieval and Synopsis Program (GRASP) to allow selective retrievals of information...
Authors
Valerie F. Paskevich
Authigenic barite in varved clays: result of marine transgression over freshwater deposits and associated changes in interstitial water chemistry Authigenic barite in varved clays: result of marine transgression over freshwater deposits and associated changes in interstitial water chemistry
No abstract available.
Authors
Erwin Suess
Sedimentation of lithogenic particles in the deep ocean Sedimentation of lithogenic particles in the deep ocean
Investigation of lithogenic particles collected by sediment traps in open-ocean stations revealed that the sediment flux increased linearly with depth in the water column. This rate of increase decreased with distance of the station from the continent; it was largest at the Panama Basin station and almost negligible at the E. Hawaii Abyssal Plain station. At the Panama Basin station...
Authors
S. Honjo, S.J. Manganini, L.J. Poppe
The influence of a diffusive sublayer on accretion, dissolution, and diagenesis at the sea floor The influence of a diffusive sublayer on accretion, dissolution, and diagenesis at the sea floor
No abstract available.
Authors
B.P. Boudreau, N.L. Guinasso
Holocene sedimentation in the shallow nearshore zone off Nauset Inlet, Cape Cod, Massachusetts Holocene sedimentation in the shallow nearshore zone off Nauset Inlet, Cape Cod, Massachusetts
Present conditions and sedimentary evolution of the shallow offshore region near Nauset Inlet on Cape Cod, Massachusetts were clarified using high-resolution seismic-reflection profiles, sidescan-sonar records, surface grab samples and current meter measurements. The study area contains three provinces: (1) a nearshore province (shallower than 18 m) with a relatively steep slope (0.6°)...
Authors
D.G. Aubrey, D.C. Twichell, S.L. Pfirman
The nature of hydrothermal exchange between oceanic crust and seawater at 26 degrees N latitude, Mid-Atlantic Ridge The nature of hydrothermal exchange between oceanic crust and seawater at 26 degrees N latitude, Mid-Atlantic Ridge
No abstract available.
Authors
R. B. Scott, D.G. Temple, P.R. Peron
A new instrument for sampling flocculent material at the water/sediment interface A new instrument for sampling flocculent material at the water/sediment interface
We have designed an instrument to collect fine-grained and flocculent material from the water/sediment interface for chemical and mineralogical analysis. The sampler can be used from a manned research submersible or by a diver in shallow water. In areas of active deposition, the material collected represents the most recently deposited sediment. This material is of interest for...
Authors
Michael H. Bothner, Page C. Valentine