This cross section set traverses four Cenozoic depositional sub-provinces: the Rio Grande Embayment, San Marcos Arch, Houston Embayment, and Sabine Arch. For each of these areas, the authors used closely spaced well logs to outline stratigraphic surfaces, para-sequences, and marker beds to delineate regional sequence boundaries, internal stratal architectures, erosional truncation surfaces, and depositional facies associations. Also included are depth ranges of reservoirs in fields adjacent to each line of section.