. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography - 3000 p X3000- A'^y VERTICAL EXAGGERATION ABOUT 25 I -1000 ec r 2000 r 3000^ 4000 Fig. 3. A. Stratigraphic section across the coastal plain, continental shelf, and continental slope at Cape Hatteras, (after Maher, 1965, plate 5). The inclination of the surface of Paleozoic basement underlying the coastal plain—continental shelf increases from about 0° 27' between the Fall Line and 130 km, to about 1° 38' seaward of that point. Seismic veloci
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography - 3000 p X3000- A'^y VERTICAL EXAGGERATION ABOUT 25 I -1000 ec r 2000 r 3000^ 4000 Fig. 3. A. Stratigraphic section across the coastal plain, continental shelf, and continental slope at Cape Hatteras, (after Maher, 1965, plate 5). The inclination of the surface of Paleozoic basement underlying the coastal plain—continental shelf increases from about 0° 27' between the Fall Line and 130 km, to about 1° 38' seaward of that point. Seismic velocities are similar in the Paleozoic basement rocks both landward and seaward of the change in inclination which strikes NE—SW along the 730-m subsea basement iso- bath (Bonini and Woollard, 1960, fig. 3) which is consistent with an erosional rather than a structural origin for the change in basement inclination. B. Stratigraphic section across the coastal plain, continental shelf, and continental slope at Cap Blanc, Mauritania (Rona, 1973, fig. 3). present vertical distance below sea level of the original shelf surface, which is cm/103 year (;7 seaward tilting) at Cape Hatteras and estimated as cm/103 year (;7 seaward tilting) at Cap Blanc. Other subsidence rates pertaining to intervals between the Late Jurassic and Recent are qualified as "apparent", rather than as actual, be- cause several assumptions are made in equating sediment accumulation with epeirogenic subsidence rates: (1) The rate of vertical sediment accumulation is controlled by the rate of subsidence. Underlying this assumption is the concept that deposition on the continental shelf is controlled by a profile of equilibrium such, that sediment is deposited up to a base level of aggradation and is eroded above that level (Barrell, 1917; Dunbar and Rodgers, 1957, p. 128—131; Krumbein and Sloss, 1963, p. 391—395). Once the continental shelf appr
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