Calcareous dinoflagellates in Cretaceous to Recent sediments of DSDP Hole 39-356
| Cobertura |
LATITUDE: -28.287000 * LONGITUDE: -41.088000 * DATE/TIME START: 1974-11-16T00:00:00 * DATE/TIME END: 1974-11-16T00:00:00 |
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| Data(s) |
30/01/1999
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| Resumo |
Calcareous dinoflagellates often dominate the dinoflagellate cyst assemblage in Cretaceous to Recent oceanic sediments. However, their distribution in Paleogene sediments has scarcely been studied. The investigation of samples from DSDP Site 356 for their calcareous dinoflagellate content revealed 35 mainly long-ranging taxa. The associations and characteristic wall types (pithonelloid, oblique, radial, tangential) fluctuate quantitatively and qualitatively in distinct stratigraphic patterns. Significant shifts, primarily at the K/T boundary and the Paleocene/Eocene boundary, reflect changes in environmental conditions. Certain dinoflagellates forming calcareous cysts, such as Operculodinella operculata, were well adapted to the relatively rapid change of environmental conditions at the K/T boundary, thus blooming to dominate the carbonate flux to the ocean floor. In contrast to the stable Paleocene associations, Eocene calcareous dinoflagellates show fluctuations in relative abundances. These fluctuations can possibly be attributed to redeposition related to increased seaward transport of specimens, due to strengthened western boundary currents. The flora includes two new genera, one new species, and two new forms: Retesphaera diadema Hildebrand-Habel, Willems et Versteegh, gen. et. sp. nov., Cervisiella saxea (Stradner, 1961) Hildebrand-Habel, Willems et Versteegh, gen. et comb. nov., Sphaerodinella? tuberosa forma elongata Hildebrand-Habel, Willems et Versteegh, comb. et forma nov., Sphaerodinella? tuberosa forma variospinosa Hildebrand-Habel, Willems et Versteegh, comb. et forma nov. Three new combinations are proposed: Cervisiella saxea (Stradner, 1961) Hildebrand-Habel, Willems et Versteegh, gen. et comb. nov., Operculodinella operculata (Bramlette et Martini, 1964) Hildebrand-Habel, Willems et Versteegh, comb. nov., and Sphaerodinella? tuberosa (Kamptner, 1963) Hildebrand-Habel, Willems et Versteegh, comb. nov. The genus Operculodinella Kienel, 1994 is emended. |
| Formato |
application/zip, 2 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.712084 doi:10.1594/PANGAEA.712084 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Relação |
Hildebrand-Habel, Tania (2002): Die Entwicklung kalkiger Dinoflagellaten im Südatlantik seit der höheren Oberkereide. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 192, 152 pp, urn:nbn:de:gbv:46-ep000103173 |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: Hildebrand-Habel, Tania; Willems, Helmut; Versteegh, Gerard JM (1999): Variations in calcareous dinoflagellate associations from the Masstrichtian to middle Eocene of the western South Atlantik Ocean (Sao Paulo Plateau, DSDP Leg 39, Site 356). Review of Palaeobotany and Palynology, 106(1-2), 57-87, doi:10.1016/S0034-6667(98)00079-7 |
| Palavras-Chave | #39-356; archeopyle diameter; Deep Sea Drilling Project; Depth; DEPTH, sediment/rock; Dinoflagellates, calcareous, diameter; Dinoflagellates, calcareous, length; Dinoflagellates, calcareous, wall thickness; Dinoflagellates, calcareous, wall thickness, inside; Dinoflagellates, calcareous, wall thickness, maximum; Dinoflagellates, calcareous, wall thickness, outside; Dinoflagellates, calcareous, width; Dinofl calc diam; Dinofl cal l; Dinofl cal w; Dinofl cal wall thick; Dinofl cal wall thick inside; Dinofl cal wall thick max; Dinofl cal wall thick outside; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg39; ODP sample designation; Sample code/label; Scanning electron microscope (SEM); South Atlantic/PLATEAU; Species |
| Tipo |
Dataset |
