Abstract
The maximum sea level position during the middle Wisconsin (oxygen isotope stage 3) is controversial, it being interpreted as anywhere from at or above present-day levels to −85 m. High-resolution seismic, lithologic, paleontologic, and radiocarbon data from the east Texas continental shelf were used to map a stage 3 shoreline. The shoreline was placed in a regional context with a study of the Texas shelf, based on seismic profiles, core, and platform boring descriptions, that identifies the stage 3 maximum flooding surface and the stage 2 sequence boundary. These surfaces were then traced up-dip on the east Texas shelf where a shore parallel escarpment was recognized. Landward of the escarpment the stage 3 maximum flooding surface is amalgamated with the stage 2 sequence boundary. Therefore, the location of the escarpment marks the up-dip limit of stage 3 deposits and a stage 3 shoreline. Lagoonal sediments with in situ brackish water fossils on-lap the escarpment. Seaward of the escarpment, remnants of barrier island facies have been preserved as a bank, Freeport Rocks Bathymetric High, located in −18 m of water. The shoreline (adjusted for subsidence) is located at −15±2 m, which is shallower than what oxygen isotope and coral records indicate.
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