Relevant bibliographies by topics / Nannofossils

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Academic literature on the topic 'Nannofossils'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 July 2024

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Journal articles on the topic "Nannofossils"

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Al-Lhaebi, Safwan. "PALEOCLIMATIC INSIGHTS ON THE CENOMANIAN-TURONIAN OCEANIC ANOXIC EVENT (OAE2) FROM NORTHERN IRAQ BASED ON CALCAREOUS NANNOFOSSILS AND GEOCHEMICAL DATA." Iraqi Geological Journal 53, no. 2C (September 30, 2020): 68–86. http://dx.doi.org/10.46717/igj.53.2c.6rs-2020-09/06.

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Calcareous nannofossils, mineralogical and geochemical investigations are carried out on the Cenomanian-Turonian boundary of the Gulneri Formation in the Azmir, Dokan and Degala sections, northern Iraq. Regarding the calcareous nannofossil data CC11 and CC12 biozones were identified. A detailed investigation was carried out to identify calcareous nannofossils species. On the basis of their stratigraphic distribution, two biozones were proposed in this study; Quadrum gartneri Interval Biozone (CC11) part and Lucianrhabdus maleformis Interval Biozone (CC12) part. Correlation with other calcareous nannofossils biozones from regional schemes led to conclude that the age of the Gulneri Formation in the studied sections is the early Turonian. Mineralogical (X-ray diffraction XRD) and trace elements geochemistry (X-ray fluorescence XRF) data along with the dominance of calcareous nannofossil Watznauria that indicates warm and arid climatic condition prevailing in the Cenomanian-Turonian transition.
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Xinrong, Cheng. "Calcareous Nannofossils in Surface Sediments of the Central and Northern Parts of the South China Sea." Journal of Micropalaeontology 11, no. 2 (December 1, 1992): 167–76. http://dx.doi.org/10.1144/jm.11.2.167.

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Abstract. Taxonomic composition and quantitative distribution of calcareous nannofossils in the nothern and central parts of the South China Sea were studied in 146 samples of surface sediments taken from estuary, continental shelf, continental slope and deep-water basin. This paper reports distribution patterns of nannofossils in the area, including nannofossil abundance, species, assemblages and specimen size. Abundance increases from shelf to slope, with a decrease from the lower part of the slope towards the abyssal plain. The assemblages are dominated by Emiliania huxleyi, Gephyrocapsa oceanica and Florisphaera profunda. Ecologically the effects of water temperature, and nutrient inputs can be detected in the distribution of nannofossils, while dilution by terrigenous materials and deep sea carbonate dissolution influence the sedimentological aspect of the samples. The composition of the South China Sea nannofossil assemblage enables it to be grouped with the central zone of the North Pacific in biogeographic zonations of nannoplankton.
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Švábenická, Lilian, Xianghui Li, Lubomír Jansa, and Yushuai Wei. "Nannofossil biostratigraphy of the Lower Cretaceous Shadui Formation (Northern Tethyan Himalayas, Southern Tibet)." Geologica Carpathica 61, no. 5 (October 1, 2010): 383–91. http://dx.doi.org/10.2478/v10096-010-0023-2.

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Nannofossil biostratigraphy of the Lower Cretaceous Shadui Formation (Northern Tethyan Himalayas, Southern Tibet)Calcareous nannofossils of Aptian-Albian age were found in the basal part of the Shadui Formation, Northern Tethyan Himalayas, Southern Tibet. The predominantly shale strata are exposed near the northeastern tip of Yamdrock Tso Lake at the locality of Bangbu and they were previously considered to be of Late Cretaceous age. Occurrence of the nannofossil speciesPrediscosphaera columnataandCribrosphaerella ehrenbergiiindicates the Upper Aptian-Lower Albian Zone BC23. Nannofossil species of Late Albian, Cenomanian or younger Cretaceous age were not present in the studied part of the Shadui Formation. Nannofossils are badly preserved and hardly identifiable probably as a result of strong post mortem etching and dissolution during burial. The depositional setting of the Shadui Formation is interpreted as hemipelagic to pelagic. A horizon of dark shale in the lower part of the Shadui Formation may be stratigraphically correlated with ocean anoxic event OAE1b. The discovery of calcareous nannofossils at the Bangbu locality increases the stratigraphic precision in the correlation of Cretaceous strata between hemipelagic-pelagic facies and shelf depositional areas in the Tibetan Tethyan Himalayas.
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Jolkicev, Nikola. "The Cretaceous/Paleogene (K/Pg) boundary in the Mezdra and Lyutidol syncline, Vratza District (West-Fore Balkan, Bulgaria)." Annales g?ologiques de la Peninsule balkanique, no. 67 (2006): 41–49. http://dx.doi.org/10.2298/gabp0667041j.

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This paper discusses the unjustified assignment (based on calcareous nannofossils) of a large portion of the Maastrichtian strata in the Mezdra and Lyutidol synclines (West Fore Balkan, Bulgaria) to the Paleogene. The co-occurrence of Paleocene nannofossils, reported by some authors, and Maastrichtian macrofossil taxa in these sections indicates diachronism in the appearance of macro- and nannofossils across the K/Pg boundary. Thus, this boundary cannot be precisely localized except if the Maastrichtian fossils are assumed to have been redeposited, but there is no evidence of resedimentation. Maastrichtian macrofossils are found not only within the range of the Paleogene nannofossil zones, but also in sections overlying them in the Kajl?ka Formation where new Maastrichtian macrofossil taxa, such as the echinoid Hemipneustes striatoradiatus (LESKE), appear and some inoceramid and cephalopod taxa range into this unit. These facts shed doubt over the applicability of nannofossils in determining the K/Pg boundary where this has already been firmly documented by macrofauna.
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Svobodová, Andrea, and Martin Kośák. "Calcareous nannofossils of the Jurassic/Cretaceous boundary strata in the Puerto Escano section (southern Spain) — biostratigraphy and palaeoecology." Geologica Carpathica 67, no. 3 (June 1, 2016): 223–38. http://dx.doi.org/10.1515/geoca-2016-0015.

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Abstract We obtained material from the Puerto Escano section (southern Spain) to study the Jurassic/Cretaceous (J/K) boundary interval. The same samples had already been processed for magnetostratigraphic studies and biostratigraphic zonation based on calpionellids and ammonites (Pruner et al. 2010), but not for calcareous nannofossils. The aim of this study was to process the samples using micropalaeontological analysis and to compare and calibrate results for calcareous nannofossils with existing magnetostratigraphic and other biostratigraphic data. The calcareous nannofossil assemblage was dominated by the genera Watznaueria, Cyclagelosphaera, Nannoconus, Conusphaera and Polycostella. Several nannofossil bioevents were recorded on the basis of the distribution of stratigraphically important taxa, including zonal and subzonal markers. Based on the lowest occurrences (LO) of M. chiastius, N. globulus minor, N. wintereri, N steinmanii minor, N. steinmannii steinmannii, N. kamptneri minor and N. kampteri kamptneri, two nannofossil subzones (NJT 15b, NJT 17a) and two nannofossil zones (NJT 16, NK-1) were recognized. The paper introduces new palaeoecological data based on geochemical analysis and macrofauna occurrences.
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Oszczypko-Clowes, Marta. "Reworked nannofossils from the Lower Miocene deposits in the Magura Nappe (Outer Western Carpathians, Poland)." Geologica Carpathica 63, no. 5 (November 13, 2012): 407–24. http://dx.doi.org/10.2478/v10096-012-0032-4.

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Abstract Studies, based on calcareous nannofossils, proved that the level of reworked microfossils had so far been underestimated. More recently detailed quantitative studies of calcareous nannoplankton of the Magura, Malcov, Zawada and Kremna formations from the Magura Nappe in Poland documented a degree of nannofossil recycling among those formations. In the Late Eocene-Early Oligocene pelagic Leluchów Marl Member of the Malcov Formation the level of redeposition is very low (0-3.80 %), however, in the flysch deposits of the Malcov Formation reworking increased to 31.4 %. Late Oligocene through Early Miocene “molasse” type deposits of the Zawada and Kremna formations contain 43.7-69.0 % of reworked nannofossils. Quantitative analyses of the reworked assemblages confirmed the domination of Paleogene nannofossil species over Cretaceous ones. The most abundant, reworked assemblages belong to the Early- Middle Eocene age.
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Kasem, Atef M., Mahmoud Faris, Luigi Jovane, Taysir Abdelhamid Ads, Fabrizio Frontalini, and Amr S. Zaky. "Biostratigraphy and Paleoenvironmental Reconstruction at the Gebel Nezzazat (Central Sinai, Egypt): A Paleocene Record for the Southern Tethys." Geosciences 12, no. 2 (February 20, 2022): 96. http://dx.doi.org/10.3390/geosciences12020096.

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The variations in assemblages of calcareous nannofossils are tracked in the Dakhla and Tarawan Formations exposed at Gebel Nezzazat (central Sinai, Egypt). Five calcareous nannofossil biozones, namely NP2/3, NP4, NP5, NP6, and NP7/8 are identified. A distinct marker bed related to the Latest Danian Event (LDE) occurs within the Dakhla Fm. The earliest representative of fasciculiths, Lithoptychius schmitzii, first occurs just below the LDE distinct bed and is followed by the Los of Diantholitha alata, D. mariposa, L. varolii, L. felis, and L. collaris. The abundance of calcareous nannofossils drops within the LDE distinctive bed. The base of Selandian Stage is here approximated at the base of Zone NP5 in concurrence with a sudden drop in the abundance of calcareous nannofossils. No considerable lithological changes are noted across this transition. The absence of subsequent occurrences of L. ulii, L. janii, L. billii, and L. stegostus suggest inconsistent lowest occurrences (Los) of these taxa, insufficient sampling resolution, and/or a hiatus. The base of Thanetian is approximated with the base of Zone NP7/8 in the topmost of Dakhla Fm. No considerable changes in calcareous nannofossil assemblages are associated in correspondence to this transition except the LO of D. mohleri, lowest continuous occurrence (LctO) of Bomolithus megastypus, and the increase in abundance of Heliolithus kleinpellii as well as a sudden drop in abundance within Zone NP7/8. The variations in calcareous nannofossil assemblages at Gebel Nezzazat suggest prevailing warm-water and oligotrophic conditions during the Paleocene and particularly along the Danian Stage that are interrupted by minor fluctuations in paleoclimatic conditions. In particular, the Danian–Selandian transition marks a decrease in warm and oligotrophic conditions that persisted along the Selandian Stage. The Selandian–Thanetian transition shows an increase of warm and oligotrophic conditions prevailed in the Thanetian record. The sudden decrease in abundance of calcareous nannofossils in both the Selandian and Thanetian is likely resulted from an increase in dissolution of carbonates rather than variations in the paleotemperature and/or paleofertility.
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Senemari, Saeedeh, Fabrizio Frontalini, Arman Jafarian, and Marziyeh Notghi Moghaddam. "Calcareous nannofossil distribution in the upper Maastrichtian–lower Thanetian interval in the Izeh zone (Southwest Iran): biostratigraphic framework and stage boundary identification in the Eastern Tethys." Stratigraphy 21, no. 1 (2024): 1–16. http://dx.doi.org/10.29041/strat.21.1.01.

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The distribution of calcareous nannofossil species in the upper part ofGurpi Formation and lower part of Pabdeh Formation has been investigated in the Karta section (northwest of Izeh in Zagros Basin, Iran, Eastern Tethys) to provide a biostratigraphic framework from Maastrichtian to Thanetian interval. In this study, 31 genera and 52 species of calcareous nannofossils have been identified and based on the recognized bioevents and the resulting biozones, the studied interval spans from the top of the nannofossil zone UC19TP to the base of the NP7 zone and covers ~10.8Myr. In this study, the Gurpi Formation spans from the upper UC19TP to NP4 zones, while the lowest part of Pabdeh Formation covers NP5, NP6 and NP7 zones. The studied sequence is continuous and encompasses Cretaceous-Paleogene (K/Pg), Danian/Selandian and Selandian/Thanetian boundaries. The K/Pg boundary is characterized by nannofossil assemblage recognized worldwide, such as the occurrence of Biantholithus, Cruciplacolithus, Braarudosphaera, Praeprinsius, and calcareous blooms of Thoracosphaera spp. Adecrease in the abundance of nannofossils is observed in the upper part of the Maastrichtian to the lower part of the Danian; poor to moderate preservation of nannofossils and low diversified nannofossil assemblages cover most of the studied samples. Here, as a result of species poor to moderate preservation, we observe patterns of stepwise extinctions upward in the top of CC25 zone, that culminate with the last occurrence of eight species, just prior to the base of the UC20bTP. We interpret these patterns to be mainly the result of diagenetic alteration. Our dataset provides a record over a long-lasting interval of stepwise extinctions toward the K/Pg boundary that was likely caused by the diagenetically-enhanced Signor-Lipps effect.
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Ćorić, Stjepan. "Calcareous nannofossils from the middle/upper Miocene succession of Pécs-Danitzpuszta, southern Hungary: cosmopolitan Paratethys and endemic Lake Pannon assemblages." Földtani Közlöny 151, no. 3 (December 4, 2021): 253–65. http://dx.doi.org/10.23928/foldt.kozl.2021.151.3.253.

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Quantitative analyses on calcareous nannofossils were carried out on 109 middle/late Miocene (Sarmatian/ Pannonian) samples from the section at Pécs-Danitzpuszta sand pit (Hungary). The lower part of the section, which can be assigned to the Sarmatian, contains normal marine low-diversity assemblages dominated by Calcidiscus leptoporus, Reticulofenestra pseudoumbilicus, Sphenolithus moriformis and Syracosphaera spp. accompanied by didemnid ascidian spicules (Perforocalcinela fusiformis). The middle/late Miocene (Sarmatian/Pannonian) boundary is characterized by the last occurrences of normal marine calcareous nannofossils. The upper part of the section (Pannonian) can be subdivided into intervals characterized by monospecific endemic nannofossils Isolithus spp. and ascidians, respectively. A short interval with common endemic coccoliths belonging to the family Noelaerhabdaceae (Bekelithella echinata, Noelaerhabdus bozinovicae, N. jerkovici, Praenoelaerhabdus banatensis) in the upper part of the profile was also documented. The drastic change in nannofossil assemblages at the Sarmatian/Pannonian boundary is a result of paleoenvironmental stress caused by the isolation of the Central Paratethys from the Eastern Paratethys.
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Stoykova, Kristalina, and Marin Ivanov. "Calcareous nannoplankton response model of the global warming at the Paleocene-Eocene boundary in Riben section, Northern Bulgaria." Review of the Bulgarian Geological Society 83, no. 3 (December 2022): 157–60. http://dx.doi.org/10.52215/rev.bgs.2022.83.3.157.

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We present a model of calcareous nannoplankton response of the global warming at the PETM, based on studies of Bulgarian sections. New data acquired from forams’carbon and oxygen isotopes, as well as high-resolution quantitative study of calcareous nannofossils suggest 3 phases of the event: pre-PETM, core of PETM and recovery phase. During the core phase, a significant increase in warm-water nannofossil species was registered, as well as signs of acidification and higher salinity of the surface waters (dissolution of carbonate skeletons of nannofossils). In the recovery phase, the cold-water species from pre-event conditions gradually return, however g. Fasciculithus completely disappears.
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Dissertations / Theses on the topic "Nannofossils"

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Bornemann, André. "Case studies of Mesozoic calcareous nannofossils implications for palaeoecology, calcareous nannofossil morphology and carbonate accumulation /." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970713509.

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Walsworth-Bell, Edward Benedict. "Jurassic calcareous nannofossils and environmental cycles." Thesis, University College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251594.

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Baky, Alaaeldin Mohamed Abdel. "Maastrichtian to early Eocene calcareous nannofossils from Egypt." Thesis, University College London (University of London), 1988. http://discovery.ucl.ac.uk/1317747/.

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A study of calcareous nannofossils from the Maastrichtian-Early Eocene from Egypt has resulted in the recognition of four Maastrichtian and seven Early Tertiary biostratigraphic zones. These nannoplankton zones are based upon local ranges and compared with the zones proposed by Martini (1971), Sissingh (1977), Verbeek (1977) and Romein (1979). A new zone, the Fasciculithus ragaae Zone is described and the E1lipsolithus macellus Zone and the Fasciculithus tympaniformis Zone are emended. Study of the vertical ranges of the species provided many markers (including the zonal markers) with distinctive first and/or last occurrence levels. The uppermost Maastrichtian and Lower Danian are missing in the study sections. There is no change in the lithology at the Cretaceous-Tertiary boundary as observed in the Esh Mellaha area, but biostratigraphic evidence shows that there is a time gap and the boundary missing. This boundary is, however, marked by a conglomerate band at Gebel Urn El Ghanayem, a thin bed of black non-calcareous shale at Gebel Duwi and a change in the lithology from chalky limestone (upper part of Sudr Chalk Formation) of Maastrichtian age to shale (lower part of Esna Shale Formation) of Early Palaeocene age at Wadi Tarfa. No continuous Cretaceous-Tertiary boundary sequence was analysed. The palaeoenvironment during the Maastrichtian-Early Eocene according to the nannofossil assemblages, was a warm open marine inner to outer shelf, although the absence of late Maastrichtian and early Danian age sediments limits observation and comment. One hundred and sixty five species have been identified. Descriptions, remarks and figures as well as schematic drawings of many species are presented. A new family RHOMBOASTERACEAE, a new genus Diadochiastozygus, five new species Fasciculithus ragaae, F. gelelii, Discoaster atefii, D. duwiensis and D. amrii are described. New combinations for Bomolithus megastypus, B. cantabriae, Diadochiastozygus imbriei, D. saepes, D. eosaepes, Tranolithus tarboulensis, Vekshinella dorfii and V. compacta are proposed. The evolution of some Cretaceous and Early Tertiary nannofloral groups is discussed and a link between the Bomolithus and Discoaster groups proposed.
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Peleo-Alampay, Alyssa M. "Miocene and oligocene calcareous nannofossils : biochronology and paleoceanography /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9823695.

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Shafik, Samir. "Late Cretaceous, early Tertiary calcareous nannofossils from Australia." Title page, contents and summary only, 1989. http://hdl.handle.net/2440/19212.

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Aguado, Merlo Roque. "Nannofósiles del cretácico de la Cordillera Bética (sur de España) bioestratigrafía /." Granada : Universidad de Granada, 1994. http://catalog.hathitrust.org/api/volumes/oclc/40940900.html.

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Kenjo, Samer. "Biostratigraphie intégrée à nannofossiles calcaires et ammonoïdes : développement et implications pour la définition et la valorisation des stratotypes d’unité et de limite. L’exemple des étages Berriasien et Valanginien et de leur limite (~140 Millions d’années)." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10156.

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L'étude biostratigraphique intégrée des ammonites et des nannofossiles calcaires de trois coupes du SE de la France (Vergol, Courchons et Berrias) a permis de proposer un nouveau schéma de biozonation solide pour l'intervalle Berriasien supérieur – Valanginien inférieur. Cette étude devrait permettre d'appuyer la proposition de la coupe de Vergol comme GSSP de la base du Valanginien. Pour ce qui concerne les ammonites, une exploitation intensive banc par banc et une révision taxonomique de l'ensemble des groupes ont montré un grand renouvellement faunique et ont amené à préciser le schéma zonal. Le Berriasien supérieur est caractérisée dans sa partie haute par une nouvelle zone, la zone à Alpillensis, qui remplace la partie supérieure de la zone à Boisseri sensu Le Hégarat. La zone à Alpillensis est subdivisée en deux sous-zones, à Alpillensis et à Otopeta. Pour le Valanginien inférieur, il a été reconnu la zone à Petransiens, pour laquelle deux nouvelles sous-zones, à Premolicus et à Salinarium, sont proposées, et la zone à Neocomiensiformis. Pour ce qui concerne les nannofossiles calcaires, plusieurs événements caractérisent la limite Berriasien/Valanginien, ainsi qu'un changement important des assemblages mis en évidence par une Analyse en Composante Principale. Ces changements sont liés probablement à une régression globale pendant la zone à Alpillensis suivie par une transgression pendant la zone à Pertransiens. Les Associations Unitaires ont mis en évidence une AU 1 dont le sommet se situe au dessus de la première apparition du nannofossile C. oblongata et de l'ammonite « Thurmanniceras » pertransiens. La succession de ces trois événements (« T. » pertransiens, C. oblongata et sommet de l'AU 1) m'ont amené à proposer l'identification de la limite Berriasien/Valanginien avec la première apparition de « T. » pertransiens
The integrated biostratigraphic study of ammonites and calcareous nannofossils in three sections from SE France (Vergol, Courchons, and Berrias) allowed a solid new biozonation scheme to be proposed here. This study should enable us to strengthen the proposition of the Vergol section as GSSP for the lower boundary of Valanginian. Concerning ammonites, an intensive exploitation bed by bed coupled to a taxonomic revision of all groups have shown a faunal renewal and brought to the proposal of a new zonal scheme. The Upper Berriasian is characterized in its upper part by a new zone, the Alpillensis zone, which replaces the upper part of the Boisseri zone sensu Le Hégarat. The Alpillensis zone is subdivided into two subzones, Alpillensis and Otopeta. For the Lower Valanginian, the Pertransiens (with the introduction of two new subzones, Premolicus and Salinarium) and Neocomiensiformis zones have been recognized. Concerning calcareous nannofossils, many events are recorded across the Berriasian/Valanginian boundary, underlying a major change in the assemblages as indicated by Principal Component Analysis. These changes are very likely linked to sea level changes. In fact, a major regression occurred in the Alpillensis zone, followed by a transgression in the Petransiens zone. Unitary Associations resulted in an UA 1 whose topmost part occurs just above the first occurrences of the nannofossil C. oblongata and of the ammonite « Thurmanniceras » pertransiens. The stratigraphic succession of these three events (namely, the FOs of « T. » pertransiens and of C. oblongata and the top of UA 1) allow us to identify the boundary between the Berriasian and Valanginian in this work with the FO of « T. » pertransiens
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Ferreira, Jorge. "Palaeoenvironmental and palaeoceanographic changes during the Lower to Middle Jurassic ( Toarcian-Aalenian, ~183-171 Ma) : new evidences from calcareous nannofossils of the Lusitanian Basin." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1033/document.

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Le biome marin du Toarcien inférieur a subi une des crises les plus significatives de l'histoire de la Terre, qui a affecté les mers épicontinentales du globe. Ces bassins épicontinentaux sont également caractérisés par l'accumulation de grandes quantités de matière organique dans les sédiments de l'époque, ce qui a été interprété comme le résultat d'un Evénement Anoxique au Toarcien inférieur (T-OAE, ~183 Ma). Le nannoplancton calcaire, qui fait partie des organismes le plus sensibles aux conditions environnementales des eaux océaniques de surface, a été profondément affecté par cette crise et sa récupération se mit en place seulement à la fin du Toarcien inférieur. Si le T-OAE a été étudié en grand détail ces dernières années, la période de récupération est beaucoup moins bien connue. A ce stade, nous ne savons pas, notamment, si la récupération de la production carbonatée primaire est représentée par un épisode rapide ou par une suite d'événements (qui feraient partie d'un plus long processus) intervenus sur quelques millions d'années après le T-OAE. Pendant les perturbations environnementales qui ont eu lieu au Toarcien inférieur, des fluctuations importantes du niveau marin ont été interprétées ainsi que des variations de la température des eaux océaniques. Après le T-OAE, le niveau marin et les températures montrent des changements plus graduels pendant une grande partie du Toarcien supérieur-Aalénien inférieur et les niches écologiques occupées par le nannoplancton calcaire sont ré-établies. Ces conditions de relative stabilité sur le long terme (~10 Ma) sont idéales pour étudier les dynamiques de la communauté des nannofossiles calcaires et, notamment, comment les différents taxons réorganisent leurs relations synécologiques. Le Toarcien-Aalénien est une période clé dans l'évolution du nannoplancton calcaire, avec des nouveaux genres qui apparaissent. Les nannofossiles de cet intervalle restent relativement peu étudié dans le Bassin Lusitanien, malgré l'importance de cette région d'un point de vue paléocéanographique. En effet ce bassin, qui était à l'origine un rift avorté lié à l'ouverture de l'Atlantique, a permis les connections entre des masses d'eaux de provenance NW européenne et sud-téthysienne. C'est dans cette région que nous retrouvons donc des mélanges de taxons liés à des différentes provinces géographiques
At ~183 Ma when large amounts of organic matter was dumped onto the ocean beds (known as the Toarcian Oceanic Anoxic Event, T-OAE), the Early Toarcian marine biota experienced one of the most important biological crises in Earth history. Calcareous nannoplankton was deeply affected and started only to recover from the end of the Early Toarcian. After the T-OAE, as phytoplankton communities dwelling the oceans photic layer recover from the previous disturbing conditions, the ecological niches once occupied by calcareous nannoplankton are again replenished. Located in the westernmost part of the Tethyan ocean, the Lusitanian Basin acted as a seaway between the NW Tethys and the Mediterranean Tethys provinces, therefore been actively influenced by these two different water masses. Hence such a region stands as the perfect spot to study the calcareous nannoplankton community, as its fossil remains bears species typical of both provinces. In order to appraise the nannoplankton demise and subsequent recovery, absolute and relative abundances of nannofossils were determined from pelagic marl-limestone couplets from three sections of the Lusitanian Basin. Also brachiopods shells were investigated for stable carbon and oxygen isotopes analysis. In order to independently assess the morphologic evolution of Lotharingius coccoliths, a Toarcian section from south France was studied. Different statistic methodologies were used throughout this work, in order to screen for robust and significant information from the numerous datasets that were built
Há cerca de 183 milhões de anos atrás, a biota marinha sofreu uma das mais importantes crises biológicas na história do planeta, quando grandes quantidades de matéria orgânica foram depositadas nos fundos oceânicos. Este episódio que teve lugar durante o Toarciano, resultou de um Evento Anóxico Oceânico (T-OAE), e afectou os mares epicontinentais à escala global. O nanoplâncton calcário, um grupo de organismos extremamente sensível às variações nas condições ambientais que têm lugar na camada superficial das massas de água, foi profundamente afectado. Foi somente no final do Toarciano Inferior que a sua recuperação se iniciou. Apesar de já muito se ter escrito sobre o T-OAE, a previsível recuperação deste grupo nunca foi sistemática nem detalhadamente estudada. Até hoje, não se sabia ainda se esta recuperação teria sido relativamente rápida, ou resultado de um processo lento e gradual que teria durado milhões de anos. Durante o Toarciano Inferior, quando as condições ambientais eram extremamente instáveis, ocorreram importantes e drásticas oscilações na temperatura e no nível médio dos oceanos. Após o T-OAE e durante todo o Toarciano e Aaleniano Inferior, as oscilações do nível médio dos oceanos e de temperatura são bastante mais suaves. À medida que a comunidade fitoplanctónica instalada na zona fótica recupera das condições extremas anteriores, os nichos ecológicos antes ocupados por nanoplâncton calcário, começam novamente a ser preenchidos. Apesar das prolongadas e suaves variações abióticas, é num ambiente então mais estável, que melhor se pode observar a evolução deste grupo, e de que forma as suas relações sinecológicas se alteraram ao longo de aproximadamente 10 milhões de anos. Apesar de ser considerado como um período onde a comunidade nanoplanctónica sofreu importantes alterações, nada se sabe em concreto que alterações foram essas que tiveram lugar após o TOAE num local tão estratégico como a Bacia Lusitânica. Situada na extremidade Oeste do Tétis e fazendo parte de um rift originado pela abertura do Atlântico, a Bacia Lusitânica actuou como um corredor que ligava livremente as massas de água das províncias mediterrânica e NW do Tétis, sendo por estas, activamente influenciada. Por essa razão, tal situação geográfica constitui um local excepcional para se estudar a comunidade de nanoplâncton calcário, uma vez que o seu registo fóssil compreende espécies típicas destas duas províncias do Tétis
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Rutledge, David Charles. "Calcareous nannofossils of the Boreal Lower Cretaceous : applications in biostratigraphy and palaeoceanography." Thesis, University College London (University of London), 1994. http://discovery.ucl.ac.uk/1360347/.

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The marine Lower Cretaceous sediments of northern, Boreal latitudes yield diverse and well-preserved calcareous nannofossil assemblages. The calcareous nannofloras of nine core and outcrop sections (of Ryazanian-Albian age) in England, Germany, the North Sea, and Barents Sea, are examined in detail (utilising 773 samples). Dense sampling of key outcrop sections (in particular, Speeton) enables calibration of the observed nannofossil events against ammonite zones. The Barents Sea sections, which are shown to be highly condensed, yield the northernmost Lower Cretaceous nannofossils to be described. The previously chaotic taxonomy of Lower Cretaceous nannofossils is revised, and a major rationalisation of genera proposed - this involves several generic emendations, and twenty five new combinations. Two new genera, Apertasphaera and Neoparhabdolithus, and nine new species are described - Apertasphaera jakubowskii, Calculites bumettiae, Clepsilithus maculosus, Cyclagelosphaera papilla, Nannoconus inomatus, Nannoconus pseudoseptentrionalis, Rucinolithus windleyae, Tegumentum bergeni and Tubodiscus parvus. In addition, one new subspecies - Rhagodiscus angustus parvus - is described, and a number of species are split into informal varieties, to avoid biostratigraphical ambiguity. Following these revisions, the suprageneric classification is reappraised, and a new family - Family Tubodiscaceae - is proposed. An updated nannofossil zonation scheme for the Ryazanian to Aptian of the Boreal area is presented; this comprises twenty two zones (labelled BC1 to BC22, in ascending order), and a number of additional subzones. Biostratigraphical resolution in the HauterivianBarremian is comparable with current ammonite zonations, and enables detailed sequence stratigraphical interpretation. Following the publication of new data from Tethyan sections (Bergen, 1994), the potential for direct inter-regional correlation is investigated; the nannofossil datums utilised generally support traditional, ammonite-based correlations but suggest that, in Boreal areas, the Hauterivian-Barremian boundary should be placed at the top of the variabilis ammonite Zone, slightly higher than its current position. Finally, the palaeoceanographical applications of Lower Cretaceous nannofossils are considered, in the light of new data on modem nannoplankton. Surface water temperature is believed to have been the principal factor controlling species distribution, throughout the history of nannoplankton; the importance of surface water fertility has probably been exaggerated in previous palaeoceanographical studies, which have been hampered by broad taxonomic concepts. There remains much to be done, in deducing the environmental preferences of Cretaceous nannofossils, but the potential for their application to palaeoenvironmental studies is good.
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Burnett, Jacqueline Anne. "North-west European late cretaceous calcareous nannofossils : biostratigraphy and selected evolutionary lineages." Thesis, University College London (University of London), 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295154.

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Books on the topic "Nannofossils"

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1955-, Crux Jason A., and Heck, Shirley E. van 1952-, eds. Nannofossils and their applications: Proceedings of the International Nannofossil Association Conference, London, 1987. Chichester [England]: E. Horwood for the British Micropalaeontological Society, 1989.

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R, Bown P., ed. Calcareous nannofossil biostratigraphy. London: Chapman & Hall, 1998.

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Antunes, Rogério Loureiro. Nanofósseis calcários do quaternário da margem continental Brasileira. Rio de Janeiro: Petrobrás, 2007.

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Shafik, Samir. Late cretaceous nannofossil biostratigraphy and biogeography of the Australian western margin. Canberra: Australian Govt. Pub. Service, 1990.

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Bown, P. R. Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. London: Palaeontological Association, 1987.

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Romaniv, A. M. Izvestkovyĭ nanoplankton melovykh i paleogenovykh otlozheniĭ Ukrainskikh Karpat. Kiev: Naukova dumka, 1991.

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Cachão, Mário Albino Pio. Utilização de nanofósseis calcários em biostratigrafia, paleoceanografia e paleoecologia: Aplicações ao neogénico do Algarve (Portugal) e do Mediterrâneo Ocidental (ODP653) e à problemática de Coccolithus pelagicus. Lisboa: Faculdade de Ciências da Universidade de Lisboa, Departamento de Geologia, Centro de Geologia, 1998.

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Amerom, H. W. J. van., ed. Salpingostoma prinsii nov. sp. and Gnetopsis robusta nov. sp., two new seeds from the Westphalian A/B of southern Limburg ; Late Quaternary calcareous nannoplankton biostratigraphy for the northern Atlantic Ocean. [Haarlem?]: Geological Survey of the Netherlands, 1990.

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Kienel, Ulrike. Die Entwicklung der kalkigen Nannofossilien und der kalkigen Dinoflagellaten-Zysten an der Kreide/Tertiär-Grenze in Westbrandenburg im Vergleich mit Profilen in Nordjütland und Seeland (Dänemark). Berlin: Selbstverlag Fachbereich Geowissenschaften, 1994.

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Isaacs, Caroline M. Supplementary data on diatoms and calcareous nannofossils and preliminary revised ages for rock samples (KG-1 to KG-24) in the Cooperative Monterey organic geochemistry study, Santa Maria and Santa Barbara-Ventura basins, California. Menlo Park, Calif: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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Book chapters on the topic "Nannofossils"

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Thierstein, Hans R. "Nannofossils Coccoliths." In Encyclopedia of Marine Geosciences, 1–4. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6644-0_78-3.

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Thierstein, Hans R. "Nannofossils Coccoliths." In Encyclopedia of Marine Geosciences, 537. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-007-6238-1_78.

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Jain, Sreepat. "Calcareous Nannofossils." In Fundamentals of Invertebrate Palaeontology, 193–260. New Delhi: Springer India, 2019. http://dx.doi.org/10.1007/978-81-322-3962-8_10.

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Houghton, S. D. "Calcareous Nannofossils." In Calcareous Algae and Stromatolites, 217–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-52335-9_13.

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Thierstein, Hans R. "Nannofossils and Coccoliths." In Encyclopedia of Marine Geosciences, 1–3. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6644-0_78-4.

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Kanungo, Sudeep, Jeremy Young, and Gosia Skowron. "Microfossils: Calcareous Nannoplankton (Nannofossils)." In Selective Neck Dissection for Oral Cancer, 1–18. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-02330-4_4-1.

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Kanungo, Sudeep, Jeremy Young, and Gosia Skowron. "Microfossils: Calcareous Nannoplankton (Nannofossils)." In Selective Neck Dissection for Oral Cancer, 1–18. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-02330-4_4-2.

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Green, Owen R. "Extraction Techniques for Calcareous Nannofossils." In A Manual of Practical Laboratory and Field Techniques in Palaeobiology, 366–74. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-017-0581-3_33.

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Raffi, Isabella, Claudia Agnini, Jan Backman, Eliana Fornaciari, Domenico Rio, and Heiko Pälike. "A New Low- to Middle-Latitude Biozonation and Revised Biochronology of Palaeogene Calcareous Nannofossils." In Springer Geology, 137–41. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04364-7_28.

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Singh, Abha, Nazim Deori, D. K. Pandey, Rajesh Singh Shekhawat, and Poonam Verma. "Biostratigraphic Implications of the Calcareous Nannofossils from the Spiti Formation at Langza, Spiti Valley." In Mesozoic Stratigraphy of India, 429–42. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71370-6_15.

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Conference papers on the topic "Nannofossils"

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Kadar*, Adi P., and Khalaf A. Karam. "Early Bajocian to Early Maastrichtian Calcareous Nannofossils Biostratigraphy of Onshore Kuwait." In International Conference and Exhibition, Melbourne, Australia 13-16 September 2015. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2015. http://dx.doi.org/10.1190/ice2015-2209064.

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P. Kadar, Adi. "Calcareous Nannofossils from Middle to Upper Jurassic Sediments of North Kuwait Onshore." In GEO 2010. European Association of Geoscientists & Engineers, 2010. http://dx.doi.org/10.3997/2214-4609-pdb.248.369.

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R. Young, C., and E. A. Spinler. "Synchronous variations in nannofossils assemblages and petrophysical parameters of North Sea chalks." In EAPG/AAPG Special Conference on Chalk. European Association of Geoscientists & Engineers, 1994. http://dx.doi.org/10.3997/2214-4609.201407554.

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Rosmadi, Nur Syahirah, Nursufiah Sulaiman, Noorzamzarina Sulaiman, and Junaidi Asis. "Comparison of different optical mounting medias used on calcareous nannofossils smear slides." In INTERNATIONAL CONFERENCE ON BIOENGINEERING AND TECHNOLOGY (IConBET2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0078842.

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Golovina, L. A. "MIOCENE CALCAREOUS NANNOFOSSILS OF EASTERN PARATETHYS: SIGNIFICANCE FOR BIOSTRATIGRAPHY, PALEOGEOGRAPHY AND PALEOECOLOGY." In Актуальные проблемы современной палинологии. Москва: Общество с ограниченной ответственностью "Издательство ГЕОС", 2022. http://dx.doi.org/10.54896/9785891188532_2022_25.

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Kadar, A. P., S. Crittenden, and K. A. Karam. "Middle Jurassic to Early Cretaceous Calcareous Nannofossils from Onshore North Kuwait: A New Record." In Fourth Arabian Plate Geology Workshop. Netherlands: EAGE Publications BV, 2012. http://dx.doi.org/10.3997/2214-4609.20142776.

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Clark, William B., and David K. Watkins. "A QUANTITATIVE ANALYSIS OF CALCAREOUS NANNOFOSSILS ACROSS A LATE OLIGOCENE PALEOLATIUDE TRANSECT OF THE NORTH ATLANTIC OCEAN." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-318571.

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Rai, Jyotsana. "Terminal Maastrichtian Age Calcareous Nannofossils Preceding K/T Mass Extinction from Aladi Formation, Vridhachalam Area, South India." In Proceedings of XXIII Indian Colloquium on Micropaleontalogy and Stratigraphy and International Symposium on Global Bioevents in Earth's History. Geological Society of India, 2015. http://dx.doi.org/10.17491/cgsi/2013/63314.

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Farida, Meutia, Ilham Alimuddin, Lili Fauzielly, and Jimmi Nugraha. "Identifying the calcareous nannofossils from the Tonasa limestone of the Karama traverse, Jeneponto area, South Sulawesi, Indonesia." In THE PROCEEDINGS OF THE 4TH EPI INTERNATIONAL CONFERENCE ON SCIENCE AND ENGINEERING (EICSE) 2020. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0094841.

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Clark, William B., M. W. Clark, and R. K. Clark. "FRACTAL GEOMETRY OF NANNOFOSSIL SPECIES DISCOASTER PENTARADIATUS." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-284950.

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Reports on the topic "Nannofossils"

1

Bown, P. R. Calcareous Nannofossils From the Late Triassic - Early Jurassic of the Queen Charlotte Islands, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132623.

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Stoykova, Kristalina, Georgi Granchovski, and Clemens V. Ullmann. First Data on the Expression of the CampanianMaastrichtian Boundary Event in Bulgaria: Calcareous Nannofossil and Carbon Isotope Record. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, December 2020. http://dx.doi.org/10.7546/crabs.2020.12.11.

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