Late Quaternary marine deposits, offshore central Texas: Processes controlling geometry, distribution, and preservation potential
Fassell, Michelle Lee
Anderson, John B.
Master of Arts
The interplay of sediment supply, accommodation space, and the rate of sea-level rise and fall, determine the thickness and overall extent of offshore deposits along the central Texas shelf. Analysis of near-shore sediment cores suggests that transgressive and highstand shorelines prograded during the Holocene. The preservation of these deposits may be likely given the geometry and distribution of older, offshore shorelines. The Stage 5d and Stage 3 highstand shorelines prograded during an overall sea-level fall. High sediment supply from longshore transport preserved thick, aerially extensive shoreline deposits. Fluvial incision varied significantly during lowstand Stage 2. As the rate of base-level fall increased from Stage 3 to 2, low sediment supply rivers incised narrow, shallow channels with no deltaic deposition, whearas sediment bypass and deeper incision prevailed for the high sediment supply rivers.