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Surficial Geology and Distribution of Post-Impoundment Sediment in Las Vegas Bay, Lake Mead

Figure 12.  The delta front of the delta off Gypsum Wash shows at the northern edge of the image. Extending southward from the delta front is a narrow channel that leads to a high-backscatter sand deposit in 20-25 m water depth. This sand deposit appears to be the surficial expression of an older delta that probably formed between 1964-1968 when the lake was about 20 m lower than at present. The seismic profile (location shown by red line on sidescan image) shows the delta deposit and the tongue of thicker sediment underlying the area of high-backscatter sands.

Figure 12. The delta front of the delta off Gypsum Wash shows at the northern edge of the image.
Figure 12. The delta front of the delta off Gypsum Wash shows at the northern edge of the image.
Figure 12. The delta front of the delta off Gypsum Wash shows at the northern edge of the image.


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