Oxygen isotopic evidence for the depth stratification of tertiary and cretaceous planktic foraminifera
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Age of the latest marine sedimentation in the western Kunlun area constrained by planktic foraminifera
2023, PalaeoworldCitation Excerpt :Species with simple and inflated forms usually dwell in the shallower water, while flatter and keeled forms colonize deeper environments. Evidence from oxygen isotope of planktic foraminifera shells confirmed that Cretaceous planktic foraminifera had similar depth distributions as today (Douglas and Savin, 1978; Hart, 1980; Leckie, 1989). Most of the planktic foraminifera in this study have spherical and inflated chambers, indicating a shallow marine environment during late Campanian to Maastrichtian.
Palaeoecological implications of stable isotope analyses of late Valanginian ammonites from central Poland
2022, Cretaceous ResearchCitation Excerpt :Isotope relationships may have long-term oscillations as a result of changes in the interaction of waters with hydrated minerals, weathering on land, and outflows on oceanic ridges. The value of δ18O was estimated at about −1‰ for Cretaceous basins (Douglas and Savin, 1978; Hudson and Anderson, 1989). As to point 2, in settings inhabited by organisms living on the sea floor and near the water surface, especially in a basin with strongly differentiated temperatures, varied temperature records may be recovered.
The planktonic foraminiferal response to the Paleocene-Eocene thermal maximum on the Atlantic coastal plain
2019, Marine MicropaleontologyCitation Excerpt :Relative abundance counts at the species level were used to calculate species richness. Species were subsequently combined into morphological groups (using descriptions by Pearson et al., 2006; Fig. 3) that occupy particular habitats in terms of depth and nutrient levels (e.g., Douglas and Savin, 1978; Berggren and Norris, 1997; Quillevere and Norris, 2003). Interpretation of assemblages at the morphological group level allows results to be compared between studies with variable taxonomic concepts.
Planktonic foraminifera and sea-level changes in the upper Cretaceous of the Gurpi Formation, Lorestan basin, SW Iran
2018, Journal of African Earth SciencesStable Isotopes: Tools for Understanding Past Climatic Conditions and Their Applications in Chemostratigraphy
2015, Chemostratigraphy: Concepts, Techniques, and Applications
Contribution No. 117 of the Department of Earth Sciences, Case Western Reserve University, Cleveland, Ohio 44100 (U.S.A.)