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 fos...

The Maastrichtian–Eocene sediments (mainly shales and limestones) penetrated by the Itori borehole Ilaro boreholes in Dahomey Basin were investigated for foraminiferal biostratigraphy palaeoecological interpretation. These Araromi, Ewekoro, Oshosun formations at varying depths. Selected shale subjected to analysis many planktonic benthic species of foraminifera (agglutinated calcareous) recover...

A 5'-terminal region of 1600-1800 base pairs was amplified, cloned, and sequenced in the large subunit rDNA (LSU rDNA) of four species of foraminifera. These sequences were compared with the homologous regions of 16 eukaryotic taxa in order to establish the phylogenetic position of foraminifera. Analysis of 610 unambiguously aligned bases shows that foraminifera branch closely to plasmodial and...

Foraminifera have one of the best known fossil records among the unicellular eukaryotes. However, the origin and phylogenetic relationships of the extant foraminiferal lineages are poorly understood. To test the current paleontological hypotheses on evolution of foraminifera, we sequenced about 1,000 base pairs from the 3' end of the small subunit rRNA gene (SSU rDNA) in 22 species representing...

Foraminifera are the most important source of information for oceanographic and climatic reconstruction on glacial–interglacial as well as on much longer time-scales. The information is contained in the chemical composition, especially the Ž 11 13 18 . isotopic ratios, of the calcitic shells e.g., d B, d C, d O . Based on the assumption that our understanding of the major parameters controlling...

The contribution of the Deccan Traps (west-central India) volcanism in the CretaceousPaleogene (KPg) crisis is still a matter of debate. Recent U-Pb dating of zircons interbedded within the Deccan lava flows indicate that the main eruptive phase (>1.1 × 106 km3 of basalts) initiated ~250 k.y. before and ended ~500 k.y. after the KPg boundary. However, the global geochemical effects of Deccan vo...

Cyanobacteria of the genus Nodularia form toxic blooms in brackish waters worldwide. In addition, Nodularia spp. are found in benthic, periphytic, and soil habitats. The majority of the planktic isolates produce a pentapeptide hepatotoxin nodularin. We examined the morphologic, toxicologic, and molecular characters of 18 nodularin-producing and nontoxic Nodularia strains to find appropriate mar...

Paleocene–Eocene warming and changes in oceanic hydrography should have significantly impacted the ecology of marine microorganisms, both at the surface and on the seafloor. We analyzed several key characteristics of foraminifera from two Shatsky Rise (ODP Leg 198) cores spanning the P/E boundary including the maximum test diameters of the largest calcareous trochospiral benthic foraminifera an...

Three new species of Streptochilus, a biserial planktic foraminiferal genus, were recognized in the lower Miocene of the eastern Atlantic and western Indian Oceans. These species had been formerly thought to be benthic species of the genus Bolivina, but evidence on their apertural morphology and stable isotopic composition indicates that they lived as plankton and should be assigned to the genu...

Traditionally, deep-sea ecosystems have been considered to be insulated from the effects of modern climate change, but with recognition importance food supply surface ocean and currents sustaining these systems, potential for rapid response benthic systems change is gaining increasing attention. However, very few ecological time-series exist deep covering twentieth century. Benthic responses pa...