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The Rio Grande Delta stood as a prominent feature on the south Texas shelf for virtually the entire last glacioeustatic cycle. During its evolution, the delta alternated between fluvial-dominated and wave-dominated regimes. Changes in delta geomorphology and facies resulted from variations in sediment supply and sea-level change. The highstand delta was initially wave-dominated but shifted to fluvial-dominated as sea level continued to fall. A large shelf-margin delta and slope fan formed during the lowstand. The delta backstepped onto the shelf during the transgression and was a fluvial-dominated system for a period of time in the mid-transgression. This phase of delta growth was undoubtedly caused by an increase in sediment supply. By mid-Holocene time, rising sea level and reduced sediment supply resulted in the delta backstepping to its current location. Holocene sedimentation has buried offshore parts of the delta beneath a hemipelagic mud blanket.

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