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Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Planktic/planktonic foraminifera"

1

Wolfgring, Erik, and Michael Wagreich. "A quantitative look on northwestern Tethyan foraminiferal assemblages, Campanian Nierental Formation, Austria." PeerJ 4 (March 8, 2016): e1757. http://dx.doi.org/10.7717/peerj.1757.

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Deposits spanning theRadotruncana calcarataTaxon Range Zone at the Postalm section, Northern Calcareous Alps (Austria) are examined quantitatively for foraminiferal assemblages, especially the planktonic group. This study focuses on establishing a high resolution record spanning an 800 ka long stratigraphic interval from the active continental margin of the Penninic Ocean. The Postalm section displays reddish limestone- marl alternations representing precession cycles. For this study, 26 samples were taken bed by bed to allow a “per-precession-cycle” resolution (i.e., a minimum sample distance of ∼20 ka). Samples from limestones as well as from marls were examined for foraminiferal assemblages. Data suggest a typical, open marine Campanian foraminiferal community. The >63 µm fraction is dominated by opportunist taxa, i.e., members ofMuricohedbergellaand biserial planktic foraminifera.Archaeoglobigerinaand “Globigerinelloides” appear frequently and benthic foraminifera are very sparsely found. The share of globotruncanids, representing more complex morphotypes amongst planktonic foraminifera, is recorded with 5–10%. The state of preservation of foraminifera from the Postalm section is moderate to poor. Differences between samples from marls and samples from limestone are evident, but do not reveal evidence that there was an influence on the postdepositional microfossil communities. However, data from microfossils showing moderate to bad preservation can still offer valuable insight into the palaeoenvironment and biostratigraphy. Information gathered on the composition of the planktonic foraminiferal assemblage confirms a low-to-mid-latitude setting for the Postalm section. As well resolved records of Late Cretaceous foraminifera assemblages are rare, the examination of theRadotruncana calcarataTaxon Range Zone provides some insights into variations and short term changes during the very short period of 800 ka.
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2

Stoykova, Kristalina, Sava Juranov, and Marin Ivanov. "Calibration of calraceous nannofossils and planktonic foraminifers’ zonation in the Lower and Middle Paleocene of Bulgaria." Geologica Balcanica 35, no. 1-2 (June 30, 2005): 3–9. http://dx.doi.org/10.52321/geolbalc.35.1-2.3.

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This study represents first attempt to juxtapose and correlate the zonal schemes of calcareous nannofossils and planktonic foraminifers in the Lower and Middle Paleocene of Bulgaria. The calibration of the two schemes is accomplished in the most complete and continuous sedimentary succession of Byala Fm., cropping out in the sections around the village of Goritsa, Varna District. In the Danian Stage the presence of NP1-NP4 nannofossil zones as well as of the planktic foraminifera zones Pα, P1a, P1b, P1c, P3a is documented. In despite of the scarce paleontological data, the presence of P0 zone in basal Danian and P2 zone in the upper Danian is suggested. In the Selandian Stage NP5 and respectively P3b zones are evidenced with exceptionally rich plankton associations. The upper part of the section is incomplete due to the overthrusting of Upper Cretaceous sediments. The most important bio-events in both group are calibrated, thus enable higher biostratigraphic resolution and accuracy of dating.
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3

Broecker, Wallace S., Susan Trumbore, Georges Bonani, Willy Wölfli, and Millie Klas. "Anomalous AMS Radiocarbon Ages for Foraminifera from High-Deposition-Rate Ocean Sediments." Radiocarbon 31, no. 2 (1989): 157–62. http://dx.doi.org/10.1017/s0033822200044817.

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Radiocarbon ages on handpicked foraminifera from deep-sea cores are revealing that areas of rapid sediment accumulation are in some cases subject to hiatuses, reworking and perhaps secondary calcite deposition. We present here an extreme example of the impacts of such disturbances. The message is that if precise chronologies or meaningful benthic planktic age differences are to be obtained, then it is essential to document the reliability of radiocarbon ages by making both comparisons between coexisting species of planktonic foraminifera and detailed down-core sequences of measurements.
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4

Saadu, Mariam B., Ayoola Y. Jimoh, Olabisi A. Adekeye, and Taofeeq A. Issa. "Biostratigraphy and Palaeoecological Studies of the Late Cretaceous-Tertiary Sediments in the Dahomey Basin, Nigeria." European Journal of Environment and Earth Sciences 3, no. 4 (July 25, 2022): 41–47. http://dx.doi.org/10.24018/ejgeo.2022.3.4.274.

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The Maastrichtian–Eocene sediments (mainly shales and limestones) penetrated by the Itori borehole and Ilaro boreholes in the Dahomey Basin were investigated for foraminiferal biostratigraphy and palaeoecological interpretation. These boreholes penetrated Araromi, Ewekoro, and Oshosun formations at varying depths. Selected shale sediments were subjected to foraminiferal analysis and many planktonic and benthic species of foraminifera (agglutinated and calcareous) were recovered from the Cretaceous interval of the penetrated boreholes. Twelve species of planktic foraminifera (Globalomalina planocompressa, G. pseudomenardii, Globigerina inaequispira, Acarinina cf.coalingenis, Acarinina nitida, Chiloguembelina cretacea, chiloguembelina subtriangularis, Orthokasrstenia sp., Hedbergella holmdelensis, Globigerina sp., Globigerinelloids asperus, Morozovella formosa formosa) and thirteen species of benthic i.e Bolivina sp., B. Crassicostata, , E. africana, Eponides psuedoelevatus, Gavelinella cf. guineana, Gavelinella pachysuturalis, Haplophragmiodes sp., Lenticulina cyprina, L. inornata, L. olokuni, L. psuedomamilligera, L. taylorensis, Nonionella communis, N. spissa, N. panamensis, Orthokarstenia sp., Planulina oyae) were identified. In general, benthic species of infauna deposit feeder and epifauna dominate the population. These species occupy a range of environments from dyoxic to anoxic, brackish water to marsh environment down to upper bathyal depth. Based on the abundant and stratigraphical distribution of the foraminiferal species, four biostratigraphic zones were recognized: Afrobolivina afra zone of late Maastrichtian, Globigerina zone of early Paleocene, Globalomalina pseudomenardii zone of late Paleocene and Morozovella formosa formosa zone of the early Eocene.
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5

D’Onofrio, Roberta, Valeria Luciani, Gerald R. Dickens, Bridget S. Wade, and Sandra Kirtland Turner. "Demise of the Planktic Foraminifer Genus Morozovella during the Early Eocene Climatic Optimum: New Records from ODP Site 1258 (Demerara Rise, Western Equatorial Atlantic) and Site 1263 (Walvis Ridge, South Atlantic)." Geosciences 10, no. 3 (February 27, 2020): 88. http://dx.doi.org/10.3390/geosciences10030088.

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Анотація:
Here we present relative abundances of planktic foraminifera that span the Early Eocene Climatic Optimum (EECO) at Ocean Drilling Program (ODP) Site 1258 in the western equatorial Atlantic. The EECO (~53.3−49.1 Ma) represents peak Cenozoic warmth, probably related to high atmospheric CO2, and when planktic foraminifera, a dominant component of marine sediment, exhibit a major biotic response. Consistent with previous work, the relative abundance of the genus Morozovella, which dominated early Paleogene tropical-subtropical assemblages, markedly and permanently declined from a mean percentage of ~32% to less than ~7% at the beginning of the EECO. The distinct decrease in Morozovella abundance occurred at Site 1258 within ~20 kyr before a negative excursion in δ13C records known as the J event and which defines the beginning of EECO. Moreover, all morozovellid species except M. aragonensis dropped in abundance permanently at Site 1258, and this is related to a reduction in test-size. Comparing our data with that from other locations, the remarkable switch in planktonic foraminifera assemblages appears to have begun first with unfavourable environmental conditions near the Equator and then extended to higher latitudes. Several potential stressors may explain observations, including some combination of algal photosymbiont inhibition (bleaching), a sustained increase in temperature, or an extended decrease in pH.
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6

Malak, Zaid A., Omar A. Al-Badrani, and Ezzat I. Al-Fandi. "Stratigraphic And Microfacies Study Of Upper Campanian - Lower Maastrichtian Succession (Shiranish Formation) In Bade Village, Bekhere Anticline, Kurdistan Region, Northern Iraq." Bulletin of the Geological Society of Malaysia 71 (May 31, 2021): 47–55. http://dx.doi.org/10.7186/bgsm71202104.

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The Upper Cretaceous Shiranish Formation outcropped close to Bade village and Bekhere anticline, Kurdistan region at northern Iraq and consists of alternating mixed tough grey limestone, marly limestone, marl beds interpreted as a middle - outer shelf – upper bathyal environments (basinal) depositional environment. Fifteen thin sections were studied under a polarized microscope to find out the petrographic component, fauna content, and for microfacies analysis. The major petrographic constituents are fossils, bioclastic grains, micrite matrix, and extraclast (quartz grains). Planktic foraminifera and nannofossils are the major particles within wackestone and packstone microfacies types. The planktonic foraminifera biozones from previous study (such as Globotruncana aegyptiaca, Gansserina gansseri, Racemiguembelina fructicosa, Plummerita hantkeninoides) and the recorded calcareous nannofossils biozones of Broinsonia parca, Reinhardtites levis, Arkhangelskiella cymbiformis, suggest a late Campanian to late Maastrichtian age.
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7

Roy, T., F. Lombard, L. Bopp, and M. Gehlen. "Projected impacts of climate change and ocean acidification on the global biogeography of planktonic Foraminifera." Biogeosciences 12, no. 10 (May 19, 2015): 2873–89. http://dx.doi.org/10.5194/bg-12-2873-2015.

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Abstract. Planktonic Foraminifera are a major contributor to the deep carbonate flux and their microfossil deposits form one of the richest databases for reconstructing paleoenvironments, particularly through changes in their taxonomic and shell composition. Using an empirically based planktonic foraminifer model that incorporates three known major physiological drivers of their biogeography – temperature, food and light – we investigate (i) the global redistribution of planktonic Foraminifera under anthropogenic climate change and (ii) the alteration of the carbonate chemistry of foraminiferal habitat with ocean acidification. The present-day and future (2090–2100) 3-D distributions of Foraminifera are simulated using temperature, plankton biomass and light from an Earth system model forced with a historical and a future (IPCC A2) high CO2 emission scenario. Foraminiferal abundance and diversity are projected to decrease in the tropics and subpolar regions and increase in the subtropics and around the poles. Temperature is the dominant control on the future change in the biogeography of Foraminifera. Yet food availability acts to either reinforce or counteract the temperature-driven changes. In the tropics and subtropics the largely temperature-driven shift to depth is enhanced by the increased concentration of phytoplankton at depth. In the higher latitudes the food-driven response partly offsets the temperature-driven reduction both in the subsurface and across large geographical regions. The large-scale rearrangements in foraminiferal abundance and the reduction in the carbonate ion concentrations in the habitat range of planktonic foraminifers – from 10–30 μmol kg−1 in their polar and subpolar habitats to 30–70 μmol kg−1 in their subtropical and tropical habitats – would be expected to lead to changes in the marine carbonate flux. High-latitude species are most vulnerable to anthropogenic change: their abundance and available habitat decrease and up to 10% of the volume of their habitat drops below the calcite saturation horizon.
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8

Roy, T., F. Lombard, L. Bopp, and M. Gehlen. "Projected impacts of climate change and ocean acidification on the global biogeography of planktonic foraminifera." Biogeosciences Discussions 11, no. 6 (June 30, 2014): 10083–121. http://dx.doi.org/10.5194/bgd-11-10083-2014.

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Abstract. Planktonic foraminifera are a major contributor to the deep carbonate-flux and the planktonic biomass of the global ocean. Their microfossil deposits form one of the richest databases for reconstructing paleoenvironments, particularly through changes in their taxonomic and shell composition. Using an empirically-based foraminifer model that incorporates three known major physiological drivers of foraminifer biogeography – temperature, food and light – we investigate (i) the global redistribution of planktonic foraminifera under anthropogenic climate change, and (ii) the alteration of the carbonate chemistry of foraminifer habitat with ocean acidification. The present-day and future (2090–2100) 3-D distributions of foraminifera are simulated using temperature, plankton biomass, and light from an Earth system model forced with historical and a future (IPCC A2) high CO2 emission scenario. The broadscale patterns of present day foraminifer biogeography are well reproduced. Foraminifer abundance and diversity are projected to decrease in the tropics and subpolar regions and increase in the subtropics and around the poles. In the tropics, the geographical shifts are driven by temperature, while the vertical shifts are driven by both temperature and food availability. In the high-latitudes, vertical shifts are driven by food availability, while geographical shifts are driven by both food availability and temperature. Changes in the marine carbon cycle would be expected in response to (i) the large-scale rearrangements in foraminifer abundance, and (ii) the reduction of the carbonate concentration in the habitat range of planktonic foraminifers: from 10–30 μmol kg−1 in the polar/subpolar regions to 30–70 μmol kg−1 in the subtropical/tropical regions. High-latitude species are most vulnerable to anthropogenic change: their abundance and available habitat decrease and up to 10% of their habitat drops below the calcite saturation horizon.
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9

Salmon, K. H., P. Anand, P. F. Sexton, and M. Conte. "Upper ocean mixing controls the seasonality of planktonic foraminifer fluxes and associated strength of the carbonate pump in the oligotrophic North Atlantic." Biogeosciences 12, no. 1 (January 13, 2015): 223–35. http://dx.doi.org/10.5194/bg-12-223-2015.

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Abstract. Oligotrophic regions represent up to 75% of Earth's open-ocean environments. They are thus areas of major importance in understanding the plankton community dynamics and biogeochemical fluxes. Here we present fluxes of total planktonic foraminifera and 11 planktonic foraminifer species measured at the Oceanic Flux Program (OFP) time series site in the oligotrophic Sargasso Sea, subtropical western North Atlantic Ocean. Foraminifera flux was measured at 1500 m water depth, over two ~ 2.5-year intervals: 1998–2000 and 2007–2010. We find that foraminifera flux was closely correlated with total mass flux, carbonate and organic carbon fluxes. We show that the planktonic foraminifera flux increases approximately 5-fold during the winter–spring, contributing up to ~ 40% of the total carbonate flux. This was primarily driven by increased fluxes of deeper-dwelling globorotaliid species, which contributed up to 90% of the foraminiferal-derived carbonate during late winter–early spring. Interannual variability in total foraminifera flux, and in particular fluxes of the deep-dwelling species (Globorotalia truncatulinoides, Globorotalia hirsuta and Globorotalia inflata), was related to differences in seasonal mixed layer dynamics affecting the strength of the spring phytoplankton bloom and export flux, and by the passage of mesoscale eddies. As these heavily calcified, dense carbonate tests of deeper-dwelling species (3 times denser than surface dwellers) have greater sinking rates, this implies a high seasonality of the biological carbonate pump in oligotrophic oceanic regions. Our data suggest that climate cycles, such as the North Atlantic Oscillation, which modulates nutrient supply into the euphotic zone and the strength of the spring bloom, may also in turn modulate the production and flux of these heavily calcified deep-dwelling foraminifera by increasing their food supply, thereby intensifying the biological carbonate pump.
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10

Salmon, K. H., P. Anand, P. F. Sexton, and M. Conte. "Upper ocean mixing controls the seasonality of planktonic foraminifer fluxes and associated strength of the carbonate pump in the oligotrophic North Atlantic." Biogeosciences Discussions 11, no. 8 (August 12, 2014): 12223–54. http://dx.doi.org/10.5194/bgd-11-12223-2014.

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Анотація:
Abstract. Oligotrophic regions represent up to 75% of Earth's open-ocean environments, and are typically characterized by nutrient-limited upper-ocean mixed layers. They are thus areas of major importance in understanding the plankton community dynamics and biogeochemical fluxes. Here we present fluxes of total planktonic foraminifera and eleven planktonic foraminifer species from a bi-weekly sediment trap time series in the oligotrophic Sargasso Sea, subtropical western North Atlantic Ocean at 1500 m water depth, over two ∼2.5 year intervals, 1998–2000 and 2007–2010. Foraminifera flux was closely correlated with total mass flux and with carbonate and organic carbon fluxes. We show that the planktonic foraminifera flux increases approximately five-fold during the winter–spring, contributing up to ∼40% of the total carbonate flux, driven primarily by increased fluxes of deeper dwelling ("globorotaliid") species. Interannual variability in total foraminifera flux, and in particular fluxes of the deep dwelling Globorotalia truncatulinoides, Globorotalia hirsuta, Globorotalia inflata, were related to differences in seasonal mixed layer dynamics affecting the strength of the spring phytoplankton bloom and export flux, and by the passage of mesoscale eddies. The heavily calcified, dense carbonate tests of deeper dwelling species (3 times denser than surface dwellers) can contribute up to 90% of the foraminiferal-derived carbonate in this region during late winter-early spring, implying a high seasonality of the biological carbonate pump in oligotrophic oceanic regions. Our data suggest that climate cycles, such as the North Atlantic Oscillation, that modulate the depth of the mixed layer, intensity of nutrient upwelling and primary production could also modulate the strength of the biological carbonate pump in the oligotrophic North Atlantic.
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Дисертації з теми "Planktic/planktonic foraminifera"

1

Pearson, Paul Nicholas. "Evolution and phylogeny of Palaeogene planktonic foraminifera." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386154.

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2

Seears, Heidi. "Biogeography and phylogenetics of the planktonic foraminifera." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/11879/.

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The planktonic foraminifera are a highly abundant and diverse group of marine pelagic protists that are ubiquitously distributed throughout the worlds’ oceans. These unicellular eukaryotes are encased in a calcareous (CaCO3) shell or ‘test’, the morphology of which is used to identify individual ‘morphospecies’. The foraminifera have an exceptional fossil record, spanning over 180 million years, and as microfossils provide a highly successful paleoproxy for dating sedimentary rocks and archiving past climate. Molecular studies, using the small subunit (SSU) ribosomal (r) RNA gene are used here to investigate the biogeographical distributions and phylogenetic relationships of the planktonic foraminifera. Biogeographical surveys of two markedly different areas of the global ocean, the tropical Arabian Sea, and the transitional/sub-polar North Atlantic Ocean, revealed significant genotypic variation within the planktonic foraminifera, with some genetic types being sequenced here for the first time. The foraminiferal genotypes displayed non-random geographical distributions, suggestive of distinct ecologies, giving insight into the possible mechanisms of diversification in these marine organisms. The ecological segregation of genetically divergent but morphologically cryptic genetic types could, however, have serious repercussions on their use as paleoproxies of past climate change. Phylogenetic analyses of the foraminifera based firstly on a partial ~1,000 bp terminal 3´ fragment of the SSU rRNA gene, and secondly on the ~3,000 bp almost complete gene supported the hypothesis of the polyphyletic origins of the planktonic foraminifera, which appear to be derived from up to 5 separate benthic ancestral lineages. The almost complete gene is sequenced here in the planktonic taxa for the first time, though amplification was problematic. In a first step to addressing a pressing need for new genetic markers to support data gained from the SSU rRNA gene, a culture system was established for the benthic foraminifera, in order to provide a reliable source of DNA for EST library construction or full genome sequencing. Finally, to overcome difficulties associated with the PCR amplification of the foraminifera, a new lysis buffer and DNA extraction procedure was developed. A highly successful buffer was created, allowing high quality DNA to be extracted from foraminiferal specimens, whilst leaving the delicate calcitic shell intact for morphological reference.
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3

Coxall, Helen Katherine. "Hantkeninid planktonic foraminifera and Eocene palaeoceanographic change." Thesis, University of Bristol, 2000. http://hdl.handle.net/1983/8efa1d22-0ff8-45a3-9a5c-bd5ea90e266f.

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The morphological and ecologicalevolution of middle-upper Eocene planktonic foraminiferal family Hantkeninidae is investigated in the context of the dramatic palaeoceanographic and climatic changes that marked the transition from Paleogene "greenhouse" to Neogene "icehouse" climatic conditions. Morphometric analysis proves that evolution in family Hantkeninidae was gradual but complex in detail with periods of relative stasis. Multiple lines of evidence demonstrate that Hantkenina evolved from planispiral clavate genus Clavigerinella and not, as was previously believed, from Pseudohastigerina micra. The ancestor of Clavigerinella was probably a low trochospiral form Paragloborotalia sp., which has been recognized for the first time in this study at a number of sites. Trends in chamber inflation, tubulospine angle and the position of the tubulospine on each chamber show the most dramatic evolutionary changes, indicating that these are the most useful characters for taxonomy. These morphological changes correlate well with known palaeoceanographic changes as well as the shift in hantkeninid ecology from a deep to a surface water habitat. Hantkeninids underwent pronounced adaptive evolution in depth habitats during the initial phase of the climatic transition. Lower middle Eocene forms lived in a cool deep-water environment within or below the oceanic thermocline and shifted to warmer surface waters in the late middle Eocene. They evolved in the low latitudes and were primarily. a tropical-subtropical group. The occurrence of Hantkenma australis at relatively high northerly and southerly latitudes during the middle Eocene may record a temporary expansion of warmer water conditions into these regions, possibly representing a hitherto unknown "hyperthermal" event. Clavigerinella is rare in middle Eocene open-ocean sequences but occasionally occurs in relative abundance in other localities (such as on continental margins and oceanic seamounts), suggesting that it was specialized for living in upwelling regions. A revised taxonomy of family Hantkeninidae is presented that reflects new understanding ofhantkeninid evolution. The reconstructed phylogeny demonstrates that the tubulospine-bearing genera Hantkenina and Cribrohantkenina represent a monophyletic clade. Multivariate analysis suggests that more than one morphological population existed at several times and that these may represent biological species. The results demonstrate that the hantkeninids are not merely passive recorders of ocean conditions but have instead evolved morphology and changed habitat in response to climate change.
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4

Barker, S. "Planktonic foraminiferal proxies for temperature and pCO2." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596364.

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The thesis aims to describe developments in the uses of planktonic foraminiferal calcite for oceanographic applications, specifically Mg/Ca ratios and foraminiferal shell weights as proxies for calcification temperature and paleo-pCO2 respectively. Sample preparation for the analysis of Mg/Ca and Sr/Ca ratios in foraminiferal calcite is investigated with the aim of defining a method that will give reproducible results and minimise signal contaminations. Each step of the cleaning procedure is scrutinised in order to gauge which are most important and which may be omitted as unnecessary and potentially detrimental to the elemental measurements being made. Success in the application of Mg/Ca-thermometry depends on the ability to quantify and compensate for any alteration of the primary signal after deposition. Compositional variations in foraminiferal calcite may be associated with partial dissolution at the seaflow. Investigation is made into the excessive scatter observed within a latitudinal transect of core-top Mg/Ca and Sr/Ca ratios and attributed to partial dissolution. Possible means of correcting or minimising the effects of such alteration are investigated and assessed. Recent interest in planktonic foraminiferal shell weight loss as a proxy for dissolution, and as such a potential means of quantifying compositional variability, demands investigation into the possibility that initial shell weight may not be constant. It is demonstrated that considerable variability does occur in the shell weights of several species of planktonic foraminifera in the modern surface ocean. It is proposed that initial shell weight is a function of calcification rate and controlled ultimately by the carbonate ion concentration, [CO3=], of ambient seawater during calcification. A first attempt is made to calibrate the effects of [CO3=] on shell weight in the modern ocean. The potential effects of anthropogenic atmospheric CO2 increases on marine calcification are then synthesised using the mineral relations between [CO3=] and calcification rate.
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5

Hudson, Wendy. "The evolution and palaeobiogeography of Mesozoic planktonic foraminifera." Thesis, University of Plymouth, 2007. http://hdl.handle.net/10026.1/719.

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Анотація:
In the 1960s Oberhauser and Fuchs (palaeontologists working at the Geologische Bundesanstalt in Vienna) described a range of new taxa from the Triassic of Austria that were thought to be the earliest planktonic foraminifera. The first reactions of the palaeontological community were negative but in the subsequent forty years our knowledge of Jurassic planktonic foraminifera has expanded considerably. A thorough re-evaluation of the Oberhauser and Fuchs collections in Vienna has shown that these species are probably not planktonic and that the first planktonic taxa appeared in the Toarcian. This origination in the centre of Western Tethys was followed by a rapid expansion of planktonic foraminifera throughout Peri-Tethys. This expansion is dominated by the genera Conoglobigerina and Globuligerina and while some believe that their separation is straightforward (based on apertural characters) analysis of large assemblages shows that this differentiation is not reliable and requires further analysis not only of holotypes, paratypes and topotypes but of large assemblages. In Southern Poland, Middle Jurassic limestones in the Pieniny Klippen Belt are described as foraminiferal packstones and represent the first evidence of a foraminiferal ooze on the ocean floor. This indicates that, by the mid-Jurassic, there was an oceanic stratification of the Aragonite and Carbonate Compensation Depths and that the modem ocean system had developed, although the depths of these various layers may have been different to those of the present day. By the Oxfordian a relatively diverse planktonic fauna had expanded throughout Peri- Tethys and, probably, around the globe in the tropics. The fauna expanded further in the early Cretaceous as Gondwana fragmented but data across the important Jurassic to Cretaceous transition is extremely limited and requires further investigation.
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6

Chapman, Mark Robert. "Late Pliocene planktonic foraminifera : palaeoceanography and faunal evolution." Thesis, University of East Anglia, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332388.

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7

Aze, Tracy. "Cope's rule and macroevolution of Cenozoic macroperforate planktonic foraminifera." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/22350/.

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Abstract A comprehensive phylogeny of macroperforate planktonic foraminifer species of the Cenozoic Era (~65 million years ago to present) is presented. The phylogeny is developed from a large body of palaeontological work that details the evolutionary relationships and stratigraphic (time) distributions of species-level taxa identified from morphology (‘morphospecies’). Morphospecies are assigned to morphogroups and ecogroups depending on test morphology and inferred habitat, respectively. Because gradual evolution is well documented in this clade, instances of morphospecies intergrading over time have been identified, allowing the elimination ‘pseudospeciation’ and ‘pseudoextinction’ from the record and thereby permit the construction of a more natural phylogeny based on inferred biological lineages. Each cladogenetic event is determined as either budding or bifurcating depending on the pattern of morphological change at the time of branching. This lineage phylogeny provides palaeontologically calibrated ages for each divergence that are entirely independent of molecular data. The tree provides a model system for macroevolutionary studies in the fossil record addressing questions of speciation, extinction, and rates and patterns of evolution. Specifically for this thesis the phylogenies provide a statistically robust framework for testing Cope’s rule (the evolutionary trend towards larger body size along a lineage). Eleven case studies were selected at random from all possible Neogene lineages and the mean areas of ancestor and descendant populations were compared. Over 6000 measurements were taken from 30 lineages and the resulting data show that Neogene macroperforate planktonic foraminifera do not support Cope’s rule with only 48% of the ancestor-descendant population comparisons demonstrating an increase in mean area. The size analysis illustrates that the most robust method for testing Cope’s rule is to compare ancestor-descendant populations from the beginning and end of evolutionary lineages as these are the least affected by temporal sampling biases.
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8

Hathorne, Edmund Charles. "The trace element and lithium isotope composition of planktonic foraminifera." Thesis, Open University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417477.

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9

Corfield, Richard Murray. "The environmental control of the evolution of Palaeocene and early Eocene planktonic Foraminifera." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328866.

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10

Fenton, Isabel. "Environmental controls on planktonic foraminiferal diversity in ancient and modern oceans." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/53930.

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Planktonic foraminifera are unicellular zooplankton, whose calcium carbonate ‘shells’, wide geographic distributions and very large population sizes combine to give them perhaps the best fossil record over the last 66 Ma of any group. Site-level assemblage diversity can be estimated comparably in the Recent and through geological time. In this thesis I model the environmental correlates of coretop (Recent) planktonic foraminiferal diversity (Chapter 2), with the aim of applying the model to the Eocene. Present-day diversity patterns are shaped by a richer combination of factors than suggested by previous work. I assess the potential of several non-biological biases to distort diversity patterns (Chapter 3). Functional and evolutionary diversity are less prone to bias than are species richness and evenness, while water depth has little impact on diversity in sites deeper than 500m. Asexuality has been suggested as an adaptation in low diversity environments. I used NanoCT scans of proloculi to test whether Neogloboquadrina pachyderma, the dominant species in polar waters, contains an asexual morph (Chapter 4), finding no support for this hypothesis. Having dealt with potential sources of bias, I use models from Chapter 2 to predict diversity in another time period, the Eocene (Chapter 5), based on current understanding of Eocene environments. The latitudinal gradient of species richness developed through the Eocene in both planktonic foraminifera and coccolithophores. Predicted and observed diversity fit well in the late – but not the early – Eocene. My analyses support two explanations for the early-Eocene mismatch. First, early Eocene climate model estimates of environment differ from the proxy records (which fit the fossil data better). Second, the intercorrelations among facets of diversity have changed through time (Chapter 6). Despite our limited understanding of some aspects of their biology, planktonic foraminifera have much to offer as a model system for macroevolution.
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Книги з теми "Planktic/planktonic foraminifera"

1

Hemleben, Ch. Modern planktonic foraminifera. New York: Springer-Verlag, 1989.

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Hemleben, Christoph, Michael Spindler, and O. Roger Anderson. Modern Planktonic Foraminifera. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3544-6.

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3

Lipson-Benitah, Shulamit. Albian planktonic foraminifera from Israel. Jerusalem: Geological Survey of Israel, 2000.

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4

BouDagher-Fadel, M. K. The early evolutionary history of planktonic foraminifera. London: Chapman & Hall, 1997.

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5

BouDagher-Fadel, M. K., F. T. Banner, and J. E. Whittaker. The Early Evolutionary History of Planktonic Foraminifera. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5836-7.

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6

Chapman, M. R. Late Pliocene planktonic foraminifera: Palaeoceanography and faunal evolution. Norwich: University of East Anglia, 1992.

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7

Foley, Kevin M. Planktic foraminifer census data from Northwind Ridge Core 5, Arctic Ocean. [Reston, Va.]: U.S. Geological Survey, 1991.

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8

Foley, Kevin M. Planktic foraminifer census data from Northwind Ridge Core 5, Arctic Ocean. [Reston, Va.]: U.S. Geological Survey, 1991.

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9

BouDagher-Fadel, Marcelle K. Biostratigraphic And Geological Significance of Planktonic Foraminifera, Second Edition. London, UK: UCL Press, 2015.

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10

Huber, Brian T. Ontogenetic morphometrics of some Late Cretaceous trochospiral planktonic foraminifera from the austral realm. Washington, D.C: Smithsonian Institution Press, 1994.

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Частини книг з теми "Planktic/planktonic foraminifera"

1

Hemleben, Christoph, Michael Spindler, and O. Roger Anderson. "Introduction." In Modern Planktonic Foraminifera, 1–7. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3544-6_1.

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2

Hemleben, Christoph, Michael Spindler, and O. Roger Anderson. "Ecology." In Modern Planktonic Foraminifera, 220–57. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3544-6_10.

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3

Hemleben, Christoph, Michael Spindler, and O. Roger Anderson. "Sedimentation — Settlement of Shells." In Modern Planktonic Foraminifera, 258–73. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3544-6_11.

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4

Hemleben, Christoph, Michael Spindler, and O. Roger Anderson. "Concluding Remarks." In Modern Planktonic Foraminifera, 274–85. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3544-6_12.

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5

Hemleben, Christoph, Michael Spindler, and O. Roger Anderson. "Taxonomy and Species Features." In Modern Planktonic Foraminifera, 8–32. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3544-6_2.

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6

Hemleben, Christoph, Michael Spindler, and O. Roger Anderson. "Collecting and Culture Methods." In Modern Planktonic Foraminifera, 33–55. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3544-6_3.

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7

Hemleben, Christoph, Michael Spindler, and O. Roger Anderson. "Cellular Ultrastructure." In Modern Planktonic Foraminifera, 56–85. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3544-6_4.

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8

Hemleben, Christoph, Michael Spindler, and O. Roger Anderson. "Host and Symbiont Relationships." In Modern Planktonic Foraminifera, 86–111. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3544-6_5.

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9

Hemleben, Christoph, Michael Spindler, and O. Roger Anderson. "Trophic Activity and Nutrition." In Modern Planktonic Foraminifera, 112–38. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3544-6_6.

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10

Hemleben, Christoph, Michael Spindler, and O. Roger Anderson. "Reproduction." In Modern Planktonic Foraminifera, 139–63. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3544-6_7.

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Тези доповідей конференцій з теми "Planktic/planktonic foraminifera"

1

Kelany, Abdel Rahman M., Sherif F. Farouk, Ahmed A. Kassem, and Mohamed E. Abuel Majd. "Sequence Stratigraphy and Paleobathymetry of the Lower-Middle Miocene Succession, Gulf of Suez, Egypt." In ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211674-ms.

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Abstract In the Gulf of Suez rift basin, the Miocene sequence is a significant hydrocarbon resource. An integration of the planktonic foraminifera, and benthic foraminiferal biofacies are data used to build a detailed and fine chronostratigraphic scheme for the lower part to middle part Miocene succession in the October Field, Gulf of Suez. The paleoecologic habits and paleobathymetry of benthic foraminiferal biofacies, as well as the planktic/benthic (P/B) ratios of the studied successions, are used to determine the paleoenvironmental conditions that are in effect during the deposition of the studied Miocene successions. Elphidium biofacies are representative of the inner shelf paleoenvironment, Nonion biofacies and Siphonina/Cibicides biofacies are representative of the middle shelf paleoenvironment, Bulimina and Uvigerina biofacies are representative of the paleoenvironment outer shelf. The paleoenvironmental interpretations and chronostratigraphic for data and the nature of stratigraphic relations are integrated to distinguish five depositional sequences in the studied section. These are two in the Aquitanian/Burdigalian, one in the Burdigalian-Langhian, one in the Langhian, and one sequence in the Serravallian ages. The sequence boundaries were marked by subaerial exposures and hiatuses. A detailed correlation between the distinguished sequence stratigraphic lower-middle Miocene frame and those established in and outside Egypt is attempted. The absolute time equivalents of the planktic foraminiferal zones are adjusted by comparison with the geologic time scale of Gradstein et al. 2022. This comparison points out a more or less compatible correlation, with a few deviations that may be related to tectonic events that led to the absence of some recorded depositional sequences.
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2

Romanova, Alexandra, Alexandra Romanova, Vladimir Anin, Vladimir Anin, Sergey Pletnev, Sergey Pletnev, Tatyana Tarasova, and Tatyana Tarasova. "CARBONATE DISSOLUTION AND ULTRASTRUCTURAL BREAKDOWN IN PLANKTONIC FORAMINIFERA IN THE SEA OF OKHOTSK." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b93b6ac2b30.99187085.

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80 sediment stations collected along the meridian transect across the Sea of Okhotsk were studied in order to reveal patterns of dissolution based on planktonic foraminifera. The degree of calcite dissolution intensity from planktonic foraminifera determined by different indices (degree of fragmentation, presence of susceptible to dissolution species, benthos/ plankton ratio). The highest degree of dissolution evidenced by a large number of shell fragments and corroding walls were found in sediments from the area of the Kuril Islands. The most revealing measure of probable dissolution of foraminiferal shells in the central part of the sea is a low number and lack of thin-walled species. The effects of dissolution on foraminiferal shells were studied for dominated species Neogloboquadrina pachyderma sin and Globigerina bulloides using a scanning electron microscope. The results are important for understanding processes of sedimentation, the paleo-oceanologial reconstructions and for obtaining reliable results in isotope analyzes.
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3

Romanova, Alexandra, Alexandra Romanova, Vladimir Anin, Vladimir Anin, Sergey Pletnev, Sergey Pletnev, Tatyana Tarasova, and Tatyana Tarasova. "CARBONATE DISSOLUTION AND ULTRASTRUCTURAL BREAKDOWN IN PLANKTONIC FORAMINIFERA IN THE SEA OF OKHOTSK." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b93cfe35991.48973379.

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80 sediment stations collected along the meridian transect across the Sea of Okhotsk were studied in order to reveal patterns of dissolution based on planktonic foraminifera. The degree of calcite dissolution intensity from planktonic foraminifera determined by different indices (degree of fragmentation, presence of susceptible to dissolution species, benthos/ plankton ratio). The highest degree of dissolution evidenced by a large number of shell fragments and corroding walls were found in sediments from the area of the Kuril Islands. The most revealing measure of probable dissolution of foraminiferal shells in the central part of the sea is a low number and lack of thin-walled species. The effects of dissolution on foraminiferal shells were studied for dominated species Neogloboquadrina pachyderma sin and Globigerina bulloides using a scanning electron microscope. The results are important for understanding processes of sedimentation, the paleo-oceanologial reconstructions and for obtaining reliable results in isotope analyzes
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4

Romanova, Alexandra, Alexandra Romanova, Vladimir Anin, Vladimir Anin, Sergey Pletnev, Sergey Pletnev, Tatyana Tarasova, and Tatyana Tarasova. "CARBONATE DISSOLUTION AND ULTRASTRUCTURAL BREAKDOWN IN PLANKTONIC FORAMINIFERA IN THE SEA OF OKHOTSK." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b4315c3db34.

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Анотація:
80 sediment stations collected along the meridian transect across the Sea of Okhotsk were studied in order to reveal patterns of dissolution based on planktonic foraminifera. The degree of calcite dissolution intensity from planktonic foraminifera determined by different indices (degree of fragmentation, presence of susceptible to dissolution species, benthos/ plankton ratio). The highest degree of dissolution evidenced by a large number of shell fragments and corroding walls were found in sediments from the area of the Kuril Islands. The most revealing measure of probable dissolution of foraminiferal shells in the central part of the sea is a low number and lack of thin-walled species. The effects of dissolution on foraminiferal shells were studied for dominated species Neogloboquadrina pachyderma sin and Globigerina bulloides using a scanning electron microscope. The results are important for understanding processes of sedimentation, the paleo-oceanologial reconstructions and for obtaining reliable results in isotope analyzes.
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5

Lamyman, Grace, Barry Fordham, Paul Pearson, Bridget Wade, Adam Woodhouse, Jeremy Young, and Tracy Aze. "MICRO- AND MACROEVOLUTION OF THE CENOZOIC PLANKTONIC FORAMINIFERA." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-379603.

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6

Brombacher, Anieke, Kirsty Marie Edgar, Paul A. Wilson, and Thomas H. G. Ezard. "USING STATISTICAL CLUSTERING TECHNIQUES TO DETERMINE THE FIRST OCCURRENCE DATUM OF THE PLANKTONIC FORAMINIFER ORBULINOIDES BECKMANNI AND THE BASE OF PLANKTONIC FORAMINIFERAL BIOZONE E12." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-322640.

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7

Shaw, Jack Oliver, Simon D'haenens, Ellen Thomas, and Pincelli M. Hull. "PLANKTONIC FORAMINIFERAL BLEACHING DURING EARLY EOCENE HYPERTHERMAL EVENTS." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-306765.

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8

Kubota, Kaoru, Tsuyoshi Ishikawa, Kazuya Nagaishi, Tatsuya Kawai, Takuya Sagawa, Minoru Ikehara, Yusuke Yokoyama, and Toshitsugu Yamazaki. "Boron Contamination during Boron Isotope Analysis of Planktonic Foraminifera." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1377.

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9

Shaw, Jack O., Pincelli M. Hull, Simon D'haenens, and Ellen Thomas. "SYMBIONT BLEACHING IN PLANKTONIC FORAMINIFERA DURING EARLY EOCENE HYPERTHERMAL EVENTS." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-285631.

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10

Saupe, Erin, Isabel S. Fenton, Adam Woodhouse, Tracy Aze, Moriaki Yasuhara, Alexander Farnsworth, and Paul J. Valdes. "THE LATITUDINAL BIODIVERSITY GRADIENT FOR PLANKTONIC FORAMINIFERA OVER THE CENOZOIC." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-367591.

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Звіти організацій з теми "Planktic/planktonic foraminifera"

1

Aksu, A. E. Planktonic foraminiferal and oxygen isotopic stratigraphy of CESAR cores 102 and 103: preliminary results. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120327.

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2

Al-aasm, I. S., and B. D. Bornhold. Stable Isotope Studies of Planktonic Foraminifera Globigerina Bulloides From Cores in the Northeast Pacific Ocean. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/120645.

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3

Hardy, I. A., L. Fisher, and T. MacGillvary. A Compilation of Planktonic and Benthonic Foraminiferal Species: Cruise CSS Hudson 82-034, Southeast Baffin Shelf. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/120595.

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