Cenomanian-Turonian sea-level transgression and OAE2 deposition in the Western Narmada Basin, India

We report the Narmada Seaway began in India during largest global sea-level transgression and Oceanic Anoxic Event 2 (OAE2) δ13C excursion late Cenomanian to early Turonian. The progressed eastward Turonian-Coniacian reached Jhilmili by end of Maastrichtian. During this time Godavari Seaways may have joined via Narmada-Tapti rift formed a Trans-India Seaway. history major seaway is entombed fossil-rich marine tectonically active zone. examined western Basin, Gujarat, improve age control based on planktic foraminifera ostracods evaluate paleoenvironmental changes Cenomanian-Turonian OAE2 excursion, δ18O records, mercury concentrations sediments as index for volcanic eruptions. Results reveal onset Basin coeval with first influx benthic Nimar Sandstone that overlies Archean rocks. peak was recorded oyster biostromes followed fluctuating values plateau overlying Limestone oysters beds, gradual decrease background tested ostracod biostratigraphy successfully compared results Pueblo, Colorado, Global Section Stratotype Point (GSSP), eastern Sinai Wadi El Ghaib section Egypt.