Showing papers in "Marine Micropaleontology in 1991"

TL;DR: The distribution of Rose Bengal stained calcareous benthic foraminifera was determined in six ☐ cores raised from water depths between 200 and 3000 m on the Nova Scotian continental margin and Gulf of Maine.

TL;DR: Culture strains ofEmiliania huxleyi have been used for a case-study of intra-specific variation in coccolith morphology and it is suggested that the strain types represent two of a limited number of varieties within the global population.

TL;DR: In this article, the authors interpret the selective abundance decline during the latest Cretaceous as a result of the seal level regression that reached a maximum just prior to the K/T boundary.

TL;DR: Eleven species and eight types in open nomenclature are new to science, one species is revised and new combinations are proposed for eight species, while new ranks are given to three holococcolith stages of species that may also bear heterococcoliths.

TL;DR: A piston core from the middle Ryukyu Trench slope contains many paleoceanographic indicators of the past ca. 150,000 years, such as the abundance change between Gephyrocapsa ericsoni and Emiliania huxleyi as discussed by the authors.

TL;DR: The diatom assemblage composition and preservation in two latest Quarternary (⋍ 100 ka to P.D.) cores from the continental slope of Portugal were studied in this article.

TL;DR: Gravity cores and grab samples collected in the Saguenay Fiord between 1976 and 1988 contain the record of a 20th century benthic marine environment contaminated primarily by organic matter discharges from several local pulp and paper mills.

TL;DR: In this paper, three uppermost Cretaceous through basal Paleocene stratigraphic sequences are examined for planktic foraminiferal assemblage stability and temporal succession patterns.

TL;DR: In this article, Q-mode cluster analysis and R-mode factor analysis of benthic foraminiferal data from 120 core tops from the northwestern Gulf of Mexico (87-1361 m; 26.4-29.0°N; 88.5-96.4°W) distinguish separate thanatotopes and faunal assemblages related to the five water masses present within the depth range of the samples.

TL;DR: A taxonomic and biostratigraphic investigation has been carried out on Upper Triassic (Carnian-Rhaetian) nannofossils from Sites 759, 760, 761 and 764 drilled on the Wombat Plateau during ODP Leg 122 as discussed by the authors.

TL;DR: In this article, a paleoslope model of Albian to Turonian benthic foraminifera reveals seven successive biofacies which are associated with increasing paleodepth.

TL;DR: In this article, the authors analyzed the biogeographic patterns in terminal Cretaceous planktonic foraminifera from their faunal compositions at a time-slice spanning the upper parts of the calcareous nannofossil Micula prinsii Zone (approximately the latest 20-60 k.y.

TL;DR: The distribution of calcareous nannofossils is documented for the middle Eocene through lowermost Miocene cores from Ocean Drilling Program Holes 699A and 703A in the subantarctic South Atlantic as discussed by the authors.

TL;DR: It is demonstrated that continuous morphologic changes characterized the evolution of the N. dutertrei lineage, therefore quantitative taxonomic differentiation of this cline into individual chronospecies is not possible and the stratigraphic significance of the central member of the lineage, N. humerosa, is reassessed.

TL;DR: In this article, the authors applied the paleobathymetric zonation for Eocene benthic Foraminifera previously proposed by one of us to this section.

TL;DR: In this paper, the authors document the occurrence of Delphineis karstenii, a neritic diatom, in pelagic sediments of the northern Cape and southern Angola Basins (southeast Atlantic Ocean).

TL;DR: Micropaleontologic analyses of Neogene sediments from Enewetak Atoll, Marshall Islands, provide data on the age of lagoonal deposits, stratigraphic disconformities and the paleoenvironmental and subsidence history of the atoll as discussed by the authors.

TL;DR: A taxonomic and biostratigraphic investigation has been carried out on Upper Triassic (Carnian-Rhaetian) nannofosils from Sites 759, 760, 761 and 764 drilled on the Wombat Plateau during ODP Leg 122 as discussed by the authors.

TL;DR: In this article, the authors analyzed morphometrically Bulimina aculeata and B. marginata from the coasts of the Northeastern U.S., Gulf of Mexico and West Africa.