Foraminiferal Genera and Their Classification

Loeblich, Alfred R.; Tappan, Helen

doi:10.1007/978-1-4899-5760-3

Cited by 1,694 publications

(1,240 citation statements)

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“…This process provided foraminifera abundance data. Tests for benthic foraminifera analysis were identified based on previous literature (e.g., VAN MORKHOVEN, 1986;LOEBLICH;TAPPAN, 1988;JONES, 1994;BARBOSA, 1998).…”

Section: Methodsmentioning

confidence: 99%

Paleoproductivity changes during the Late Quaternary in the southeastern Brazilian upper continental margin of the Southwestern Atlantic

et al. 2010

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A B S T R A C TChanges in the Brazilian continental margin's oceanic productivity and circulation over the last 27,000 years were reconstructed based on sedimentological and microfaunal analyses. Our results suggest that oceanic paleoproductivity and the supply of terrigenous sediments to the Brazilian continental margin were higher during the Last Glacial Maximum (LGM) than during the Holocene. These changes may have been primarily influenced by significant sea level fluctuations that have occurred since the late Pleistocene. During the LGM, the lower sea level, higher productivity and lower sea-surface paleotemperatures may have been the result of the offshore displacement of the main flow of the Brazil Current. However, during the Holocene, the warm waters of the Brazil Current were displaced toward the coast. This displacement contributed to the increase in water temperature and prevented an increase in oceanic productivity. The decrease in terrigenous supply since the LGM could be related to the increase of the extension of the continental shelf and/or drier climatic conditions. R E S U M OMudanças na produtividade e circulação oceânica da margem continental Brasileira foram reconstituídas a partir de análises sedimentológicas e microfaunísticas realizadas em sedimentos de um testemunho representativo dos últimos 27 000 anos. Nossos dados sugerem maior produtividade oceânica e suprimento de sedimento terrígeno na área de estudo no Último Máximo Glacial (UMG) do que no Holoceno. Estas mudanças foram principalmente influenciadas por flutuações do nível relativo do mar. Durante o UMG, num cenário de nível relativo do mar mais baixo, a maior produtividade oceânica e menor temperatura da superfície do mar, podem ter sido produtos do deslocamento para o largo da Corrente do Brasil. No Holoceno, o deslocamento para a costa das águas quentes da Corrente do Brasil contribuiu para o aumento na temperatura da água e menor produtividade oceânica. A diminuição do aporte de sedimentos terrígenos desde o UMG pode estar relacionado ao aumento da extensão da plataforma continental e/ou a condições climáticas mais secas no continente.

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Section: Methodsmentioning

confidence: 99%

Paleoproductivity changes during the Late Quaternary in the southeastern Brazilian upper continental margin of the Southwestern Atlantic

et al. 2010

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“…Orbitolinids pertain to two distincts subfamilies: Orbitolininae and Dictyoconinae (Moullade, 1965;Loeblich and Tappan, 1988) the splitting of which is mainly based upon the macro spheric embryo organization (Schroeder, 1963). However, distinc tive morphologic trends are also taxonomically relevant.…”

Section: Palaeontological Aspectsmentioning

confidence: 99%

“…"Orbitolina facies" mainly refers to the Orbitolininae, the time range of which is from the Barremian to the Cenomanian (Loeblich and Tappan, 1988). In the late Barremian-early Aptian the cardinal form of this group was Palorbitolina lenticularis (Blumenbach), a species known from Mexico (Meza, 1980), the Central Atlantic (Gupta and Grant, 1971), the Mediterranean, Middle East and African regions (Pelissie et aI., 1982;Peybernes, 1982;Peybernes and Forster, 1987;Simmons and Hart, 1987), Borneo (Hofker, 1963) and the Philippines (Wolcke and Scholz, 1988).…”

Section: Palaeontological Aspectsmentioning

confidence: 99%

Orbitolina episodes in carbonate platform evolution: the early Aptian model from SE Spain

Vilas¹,

Masse

Arias³

1995

Palaeogeography, Palaeoclimatology, Palaeoecology

112

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Among the Orbitolininae, Palorbitolina lenticularis (Blumenbach) is a common facies marker in Upper Barremian Lower Aptian shallow water Mesogean deposits and was hitherto ascribed to specifi c, but contrasting paleoenviron ments within the carbonate platform facies suites. The Albacete-Prebetic area (SE Spain) illustrates a model in which the Palorbitolina facies spread over the whole platform system. The development of the Palorbitolina sediments coincided with a transgressive trend at the end of an important terrigenous period. This model could also be applied to similar Middle Cretaceous "Orbitolina" facies.

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“…A microsplitter was then used to obtain an aliquot containing a minimum of 270 benthic foraminifera specimens within the >63 mm fraction. All benthic specimens were picked under light microscope, mounted on faunal slides and identified using the generic classification of Loeblich and Tappan [1987]. The relative abundance and the benthic foraminiferal accumulation rates (BFARs) of the most characteristic benthic foraminiferal species along core MD02-2589 were calculated.…”

Section: Methodsmentioning

confidence: 99%

Paleoceanography of the southern Agulhas Plateau during the last 150 ka: Inferences from benthic foraminiferal assemblages and multispecies epifaunal carbon isotopes

et al. 2007

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[1] Benthic foraminiferal assemblages and the carbon isotope composition of the epifaunal benthic foraminifera Epistominella exigua and Fontbotia wuellerstorfi have been investigated along core MD02-2589 located at the southern Agulhas Plateau (41°26.03 0 S, 25°15.30 0 E, 2660 m water depth). This study aims to evaluate changes in the benthic paleoenvironment and its influence on benthic d 13 C with a notable focus on E. exigua, a species associated with phytodetritus deposits and poorly studied in isotope paleoceanographic reconstructions. The benthic foraminiferal assemblages (>63 mm) show large fluctuations in species composition suggesting significant changes in the pattern of ocean surface productivity conceivably related to migrations of the Subtropical Convergence (STC) and Subantarctic Front (SAF). Low to moderate seasonality and relatively higher food supply to the seafloor are indicated during glacial marine isotope stages (MIS) 6, 4, and 2 and during MIS 3, probably associated with the northward migration of the SAF and confluence with the more stationary STC above the southern flank of the Agulhas Plateau. The lowest organic carbon supply to the seafloor is indicated from late MIS 5b to MIS 4 as a consequence of increased influence of the Agulhas Front (AF) and/or weakening of the influence of the STC over the region. Episodic delivery of fresh organic matter, similar to modern conditions at the core location, is indicated during MIS 5c-MIS 5e and at Termination I. Comparison of this paleoenvironmental information with the paired d 13 C records of E. exigua and F. wuellerstorfi suggests that organic carbon offsets d 13 C of E. exigua from ambient bottom water d 13 C DIC , while its d 13 C amplitude, on glacial-interglacial timescales, does not seem affected by changes of organic carbon supply to the seafloor. This suggests that this species calcifies preferentially during the short time span of the year when productivity peaks and phytodetritus is delivered to the seafloor. Therefore E. exigua, while offset from d 13 C DIC , potentially more faithfully records the amplitude of ambient bottom water d 13 C DIC changes than F. wuellerstorfi, notably in settings such as the Southern Ocean that experienced substantial changes through time in the organic carbon supply to the seafloor.Citation: Diz, P., I. R. Hall, R. Zahn, and E. G. Molyneux (2007), Paleoceanography of the southern Agulhas Plateau during the last 150 ka: Inferences from benthic foraminiferal assemblages and multispecies epifaunal carbon isotopes, Paleoceanography, 22, PA4218,

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Foraminiferal Genera and Their Classification

Cited by 1,694 publications

References 0 publications

Paleoproductivity changes during the Late Quaternary in the southeastern Brazilian upper continental margin of the Southwestern Atlantic

Paleoproductivity changes during the Late Quaternary in the southeastern Brazilian upper continental margin of the Southwestern Atlantic

Orbitolina episodes in carbonate platform evolution: the early Aptian model from SE Spain

Paleoceanography of the southern Agulhas Plateau during the last 150 ka: Inferences from benthic foraminiferal assemblages and multispecies epifaunal carbon isotopes

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