Late Quaternary stratigraphic evolution of east Texas mid-outer shelf and upper slope
Sarzalejo, Sabrina Esther
Anderson, John B.
Master of Arts
This study documents the evolution of the low sediment-supply Trinity-Sabine incised valley system during the last eustatic fall and rise. Two high sediment supply fluvial-deltaic systems, the Western Louisiana and the Brazos, acted together with the Trinity-Sabine system to produce a unique distribution of facies in the study area. Nine seismic facies were recognized using high-resolution seismic data, boring descriptions and core samples. Sequence stratigraphic techniques were used to identify major surfaces and sedimentary packages. Five phases of evolution occurred, from the last glacial eustatic highstand to the Holocene transgression. The interplay of tectonics, eustasy and sediment supply produced sedimentary bodies with a variety of internal and external configurations. High-resolution seismic data images the complexity of the deposits, in contrast to conventional seismic data. High resolution seismic data, in conjunction with cores, constitutes a powerful tool for unravelling the stratigraphic history of the study area and for testing stratigraphic models.