Offshore Features
The synchronous development of the Colorado River Delta and the associated Gran Desierto sand sink continues offshore into the Gulf of California. Reports on the submarine topography of the Gulf of California by van Andel, describe three former river channels on the seafloor: one originating at the present-day Colorado delta, another from the area of the paleo-delta between El Golfo and Salina Grande, and a third to the area of present-day Puerto Penasco. Rusnak et al. reported on sonar soundings which discovered the valleys and also describe two elongate depressions, each about 40 km in length, into which the valley networks terminate at a depth of ~180 m below sea level. Those incised valley systems were also interpreted as fluvial in origin.
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