. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 320 CONTINENTAL SHELF SEDIMENTATION 1967; Stanley et al., 1968; Sarnthein, 1972). Other ex- ceptions are the "perilittoral" deltas of terrigenous sand which seem to have survived transgression in the Gulf of Mexico (Curray, 1964, p. 299). The latter are large river-fed spits that grow in the direction of littoral drift, causing the river to flow parallel to the coast before it breaks out to the sea. End moraines have survived on the New En
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 320 CONTINENTAL SHELF SEDIMENTATION 1967; Stanley et al., 1968; Sarnthein, 1972). Other ex- ceptions are the "perilittoral" deltas of terrigenous sand which seem to have survived transgression in the Gulf of Mexico (Curray, 1964, p. 299). The latter are large river-fed spits that grow in the direction of littoral drift, causing the river to flow parallel to the coast before it breaks out to the sea. End moraines have survived on the New England-Canadian shelf (King et al., 1972), but they were apparently emplaced seaward of the shoreline by grounded ice; King notes the vulnerability of glacial deposits on the present shoreline to glacial attack. The rinnentaler of the North Sea (subicestream channels) may likewise have been formed by an ice sheet seaward of the shoreline (Brouwer, 1964). Survival of Nearshore Marine Patterns the surficial sand sheet. The most characteristic aspect of shelves undergoing autochthonous sedimenta- tion is the discontinuous surficial sand sheet 0 to 10 m thick, deposited during the erosional retreat of the shoreface during the Holocene transgression (Fig. 8). On flat-lying constructional shelves such as the Middle Atlantic Bight of North America, relief elements on the surface of this sheet formed as the zones of nearshore sand storage (estuary mouth and cape extension shoals; shoreface-connected sand ridges: Swift et al., 1972), and both the surface morphology and the internal structure of the sand sheet bear little relation to the surface morphology and the internal structure of the older strata beneath (McClennen and McMaster, 1971). On shelves of greater relief, the surficial sediment blanket occurs as a thin drape over topographic highs, broken by substrate outcrops. In the adjoining basins, marginal sands, shed by highs, pass laterally into deposits of mud (Fig. 9). The stratig
Size: 5298px × 472px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1900, bookcollectionamericana, bookleafnumber553
