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Mapping the floor of Lake Mead (Nevada and Arizona): Preliminary discussion and GIS data release, USGS Open-File Report 03-320
Figure 5. Sidescan-sonar image of the central part of Gregg Basin. Figure 5. Sidescan-sonar image of the central part of Gregg Basin. Figure 5. Sidescan-sonar image of the central part of Gregg Basin. Figure 5. Sidescan-sonar image of the central part of Gregg Basin. Figure 5. Sidescan-sonar image of the central part of Gregg Basin. Figure 5. Sidescan-sonar image of the central part of Gregg Basin.



Figure 5. Sidescan-sonar image of the central part of Gregg Basin. Post-impoundment sediment covers the basin floor, and it is fringed on the west by Quaternary alluvial fan deposits and on the east by outcroppings of Cenozoic rocks. The post-impoundment sediment has a moderate backscatter surface along the axis of the basin while it has a low-backscatter surface in embayments along the edges of the basin. Two channels etch the surface of the post-impoundment sediment. Location of figure is shown in Figure 3.
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