Showing papers in "Marine Micropaleontology in 1976"

TL;DR: In this article, it was estimated that 92% of coccoliths produced in the euphotic layer were thus being transported to the deep-sea bottom, and the majority of freed coccolith will be dissolved in the undersaturated water column before arriving at the bottom.

TL;DR: In this article, the effects of differential solution and diagenetic calcification reveal a considerable morphologic variability within numerous species and the available information is incorporated into a stratigraphic scale allowing correlation over wide distances and across paleoprovincial boundaries.

TL;DR: In this article, the authors defined a set of nannoplankton assemblages for the North and South Atlantic Ocean, Caribbean Sea, and Gulf of Mexico and identified and grouped them according to their relative environmental distribution.

TL;DR: In the Andalusian Stage stratotype, located in the Atlantic-connected Guadalquivir Basin of southwestern Spain, paleobathymetric analysis of benthonic foraminifera indicates a marked reduction in water level, from ca. 70-100 m to ca. 30 m, in uppermost N17 levels, and a return to former water depths coincidentally with the beginning of the Pliocene (Zone N18 microfauna) which is calibrated tot = 5.5 Ma.

TL;DR: In this paper, a morphological variation in terms of test size, shape and coiling direction in Globigerina bulloides d'Orbigny has been measured in 22 Recent surface sediment samples in southern subtropical to northern Antarctic waters (30°S to 53°S) of the southern Indian Ocean.

TL;DR: In this article, the position of the Subtropical Convergence and Polar Front during the last 500,000 years is recorded by frequency changes in the total planktonic foraminiferal fauna, by coiling changes in Neogloboquadrina pachyderma and by changes in species diversity.

TL;DR: In this paper, individual diatom datums are proposed as markers for North Pacific diatom zones XXIII through IX of Schrader are recognizable in the middle Miocene to lower Pliocene stratigraphic section exposed around Upper Newport Bay in Newport Beach, California.

TL;DR: The deposition of skeleton within cytoplasmic sheaths, which may act as a template for skeletal morphology, is examined and the significance of these findings for radiolarian physiology and skeleton architecture is discussed.

TL;DR: In this paper, an examination of its calcareous and siliceous microfauna and microflora indicates that the El Cuervo section (Andalusia, Spain) is a lower bathyal deposit (formed between 1000 and 1500 m in a zone of near-coastal upwelling) of early Late Miocene age, penecontemporaneous with the lower part of the stratotype Andalusian Stage and equivalent to a part of Magnetic Epochs 10 and/or 11.

TL;DR: Sphaerozoum punctatum is a colonial radiolarian possessing siliceous spicules and the central capsule membrane persists during early stages of swarmer development.

TL;DR: In this paper, the Iberian Portal between the Atlantic and the western Tethys basin complex at a depth estimated at more than 2000 m. The authors inferred that this opening represents a structural trough closed by Alpine-type lateral movements during the Late Miocene (Messinian) during the Messinian “salinity crisis”.

TL;DR: In this paper, principal component analyses of the percentages of 19 species of planktic foraminifera in 22 Gulf of Mexico deep-sea cores of late Quaternary age show that the first component for each core generates an approximate paleotemperature curve.

TL;DR: In this article, the authors applied a North Atlantic-based transfer function to the counts of the fraction greater than 149 μm and found that in all the samples the tropical assemblage is dominant.

TL;DR: The morphology, stratigraphic ranges, and occasional intergradation of four dinoflagellate cyst species from the Barton Beds of the Hampshire Basin indicate that they represent an evolutionary series of Areosphaeridium multicornutum, which is a continuation of the lineage described by Eaton.