. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography sec North - J " >'i - - i r' v ~~ h^? â 1 â ' .r. > i M. Figure 11. Copy of original seismic section of the south- ern part of the sill between the two deeps of the Cariaco Basin (Profile 3). Arrows: A3 multiplies; B3 stratified slope sediments; C3 buried canyon with small channel on top; D3 competent rocks; E} arch; F3 stratified sediments southern slope of the sill is underlain by the rocks with similar reflective characteristics. At 10
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography sec North - J " >'i - - i r' v ~~ h^? â 1 â ' .r. > i M. Figure 11. Copy of original seismic section of the south- ern part of the sill between the two deeps of the Cariaco Basin (Profile 3). Arrows: A3 multiplies; B3 stratified slope sediments; C3 buried canyon with small channel on top; D3 competent rocks; E} arch; F3 stratified sediments southern slope of the sill is underlain by the rocks with similar reflective characteristics. At 10°33'N there may be a 600 m deep filled- in canyon. Its top is occupied by either sediment slumps, or a small leveed channel. The southern slope is underlain by approximately 300 m of well stratified sediments with large slumps at 10°30'N. About 600 m below the surface of the slope in this area a horizontal reflector indicates a major unconformity. To the south, sediments on the slope return only incoherent reflections that may also be the result of slumping. There is a major acoustic basement type reflector 150-200 m below these sedi- ments . Profile 2 crosses the western deep of the Cariaco Basin. South of the sharp shelf break of the Tortuga-Margarita Bank, the hummocky bottom and the incoherent reflections may indicate large slump blocks, although it is equally possible that these reflections represent more competent rocks that plunge below the softer sediments to the south. From near the base of the slope to approximately 10°45'N, several normal faults of small displacement offset the well stratified sediments. The faults at 10°45'N appear to be related to a broad arch, centered at 10°43'N (fig. 12), which divides the western deep of the Cariaco Basin into two halves. The northern half of the western deep is characterized by a sequence of well stratified and faulted sediments. Recent uplift of the arch is suggested by the approximately 40 m higher elevation
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