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The Late Cretaceous Epoch was characterized by major\udglobal perturbations in the carbon cycle, the most prominent occurring near\udthe Cenomanian–Turonian (CT) transition marked by Oceanic Anoxic Event 2\ud(OAE-2)\udat 94.9–93.7 Ma. The Cretaceous Western Interior Seaway (KWIS) was one of\udseveral epicontinental seas in which a complex water-mass evolution was\udrecorded in widespread sedimentary successions. This contribution integrates\udnew data on the main components of organic matter, geochemistry, and stable\udisotopes along a north–south transect from the KWIS to the equatorial\udwestern Atlantic and Southern Ocean. In particular, cored sedimentary rocks\udfrom the Eagle Ford Group of west Texas (∼ 90–98 Ma)\uddemonstrate subtle temporal and spatial variations in palaeoenvironmental\udconditions and provide an important geographic constraint for interpreting\udwater-mass evolution. High-latitude (boreal–austral), equatorial Atlantic\udTethyan and locally sourced Western Interior Seaway water masses are\uddistinguished by distinct palynological assemblages and geochemical\udsignatures. The northward migration of an equatorial Atlantic Tethyan\udwater mass into the KWIS occurred during the early–middle Cenomanian (98–95 Ma) followed by a major re-organization during the latest\udCenomanian–Turonian (95–94 Ma) as a full connection with a northerly boreal\udwater mass was established during peak transgression. This oceanographic\udchange promoted de-stratification of the water column and improved\udoxygenation throughout the KWIS and as far south as the Demerara Rise off\udSuriname. In addition, the recorded decline in redox-sensitive trace metals\udduring the onset of OAE-2 likely reflects a genuine oxygenation event\udrelated to open water-mass exchange and may have been complicated by\udvariable contribution of organic matter from different sources (e.g.\udrefractory/terrigenous material), requiring further investigation

Water-mass evolution in the Cretaceous Western Interior Seaway of North America and equatorial Atlantic