Figure F12. The Marshall Paraconformity (38 cm), marked by the burrowed surface between basal Unit II Miocene (27 Ma) nannofossil-bearing mudstone and the top of Unit III late Oligocene (33 Ma) nannofossil chalk (interval 181-1124C-43X-2, 28-48 cm; 411.48-411.68 mbsf).