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  • ddc:551  (4)
  • Biostratigraphie  (2)
  • English  (6)
  • German
  • Romanian
  • 2020-2023  (4)
  • 1995-1999  (2)
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  • English  (6)
  • German
  • Romanian
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  • 1
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    Biostratigraphy in Production and Development Geology (1999)
    London : The Geological Society
    Details
    Keywords: Biostratigraphie ; Erdölgeologie ; Bioestratigrafia ; Biostratigraphie ; Geology, Economic ; Geology, Stratigraphic ; Géologie économique ; Micropaleontologia ; Paleontology, Stratigraphic ; Petroleum ; Prospecting ; Prospecção geológica ; Pétrole - Géologie ; Stratigraphie
    Description / Table of Contents: R. W. Jones and M. D. Simmons: Preface and Introduction / Geological Society, London, Special Publications, 152:1-3, doi:10.1144/GSL.SP.1999.152.01.01 --- S. N. J. Payne, D. F. Ewen, and M. J. Bowman: The role and value of ‘high-impact biostratigraphy’ in reservoir appraisal and development / Geological Society, London, Special Publications, 152:5-22, doi:10.1144/GSL.SP.1999.152.01.02 --- S. Duxbury, D. Kadolsky, and S. Johansen: Sequence stratigraphic subdivision of the Humber Group in the Outer Moray Firth area (UKCS, North Sea) / Geological Society, London, Special Publications, 152:23-54, doi:10.1144/GSL.SP.1999.152.01.03 --- P. H. Morris, S. N. J. Payne, and D. P. J. Richards: Micropalaeontological biostratigraphy of the Magnus Sandstone Member (Kimmeridgian-Early Volgian), Magnus Field, UK North Sea / Geological Society, London, Special Publications, 152:55-73, doi:10.1144/GSL.SP.1999.152.01.04 --- D. J. Shipp: Well-site biostratigraphy of Danish horizontal wells / Geological Society, London, Special Publications, 152:75-84, doi:10.1144/GSL.SP.1999.152.01.05 --- J. A. Bergen and P. J. Sikora: Microfossil diachronism in southern Norwegian North Sea chalks: Valhall and Hod fields / Geological Society, London, Special Publications, 152:85-111, doi:10.1144/GSL.SP.1999.152.01.06 --- P. J. Sikora, J. A. Bergen, and C. L. Farmer: Chalk palaeoenvironments and depositional model, Valhall-Hod fields, southern Norwegian North Sea / Geological Society, London, Special Publications, 152:113-137, doi:10.1144/GSL.SP.1999.152.01.07 --- M. D. Bidgood, A. G. Mitlehner, G. D. Jones, and D. J. Jutson: Towards a stable and agreed nomenclature for North Sea Tertiary diatom floras — the ‘Coscinodiscus’ problem / Geological Society, London, Special Publications, 152:139-153, doi:10.1144/GSL.SP.1999.152.01.08 --- N. A. Holmes: The Andrew Formation and ‘biosteering’ — different reservoirs, different approaches / Geological Society, London, Special Publications, 152:155-166, doi:10.1144/GSL.SP.1999.152.01.09 --- G. Mangerud, T. Dreyer, L. Søyseth, O. Martinsen, and A. Ryseth: High-resolution biostratigraphy and sequence development of the Palaeocene succession, Grane Field, Norway / Geological Society, London, Special Publications, 152:167-184, doi:10.1144/GSL.SP.1999.152.01.10 --- R. W. Jones: Forties Field (North Sea) revisited: a demonstration of the value of historical micropalaeontological data / Geological Society, London, Special Publications, 152:185-200, doi:10.1144/GSL.SP.1999.152.01.11 --- D. McLean and S. J. Davies: Constraints on the application of palynology to the correlation of Euramerican Late Carboniferous clastic hydrocarbon reservoirs / Geological Society, London, Special Publications, 152:201-218, doi:10.1144/GSL.SP.1999.152.01.12 --- M. D. Simmons, M. D. Bidgood, P. Brenac, P. D. Crevello, J. J. Lambiase, and C. K. Morley: Microfossil assemblages as proxies for precise palaeoenvironmental determination — an example from Miocene sediments of northwest Borneo / Geological Society, London, Special Publications, 152:219-241, doi:10.1144/GSL.SP.1999.152.01.13 --- R. W. Jones, N. E. Jones, A. D. King, and D. Shaw: Reservoir biostratigraphy of the Pedernales Field, Venezuela / Geological Society, London, Special Publications, 152:243-257, doi:10.1144/GSL.SP.1999.152.01.14 --- J. M. Armentrout, L. B. Fearn, K. Rodgers, S. Root, W. D. Lyle, D. C. Herrick, R. B. Bloch, J. W. Snedden, and B. Nwankwo: High-resolution sequence biostratigraphy of a lowstand prograding deltaic wedge: Oso Field (late Miocene), Nigeria / Geological Society, London, Special Publications, 152:259-290, doi:10.1144/GSL.SP.1999.152.01.15 --- C. J. Van Der Zwan and W. A. Brugman: Biosignals from the EA Field, Nigeria / Geological Society, London, Special Publications, 152:291-301, doi:10.1144/GSL.SP.1999.152.01.16 --- B. J. O’Neill, A. E. DuVernay, and R. A. George: Applied palaeontology: a critical stratigraphic tool in Gulf of Mexico exploration and exploitation / Geological Society, London, Special Publications, 152:303-308, doi:10.1144/GSL.SP.1999.152.01.17
    Pages: Online-Ressource (318 Seiten) , Illustrationen, Diagramme ; 25cm + fold out charts
    ISBN: 1862390312
    URL: http://sp.lyellcollection.org/content/152/1
    Language: English
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  • 2
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    Stochastic Modeling Approach to Identify Uncertainties of Karst Conduit Networks in Carbonate Aquifers (2022)
    Details
    Publication Date: 2022-12-07
    Description: The characterization of the karst conduit network is an essential task to understand the complex flow system within karst aquifers. However, this task is challenging and often associated with uncertainty. Equivalent porous media approaches for modeling flow in karst aquifers fall short of capturing the hydraulic effect of individual karst features, while process‐oriented karst evolution models imply major computational efforts. In this study, we apply the Stochastic Karst Simulator (SKS) developed by Borghi et al. (2012) to generate karst conduit networks at a regional scale of a highly karstified carbonate aquifer located in the Eastern Mediterranean region and extensively used for water supply. The SKS generates conduit network geometries reasonably quick, using a mathematical proxy that mimics conduit evolution. The conduit simulation is based on a conceptual model of the genesis of the aquifer, consisting of different karstification phases. The stochastic approach of the algorithm enables us to generate an ensemble of conduit network realizations and to represent the uncertainties of these simulations in a Karst Probability Map. With only soft input information to constrain conduit evolution, multiple equivalent realizations yield similar resulting network geometries, indicating a robust approach. The presented methodology is numerically efficient, and its input can be easily adjusted. Subsequently, the resulting stochastic spatial distribution of conductivities can be employed for the parametrization of regional karst groundwater models.
    Description: Key Points: We statistically generate multiple sets of karst conduit network geometries using input data based on soft information. The resulting Karst Probability Map accounts for uncertainty in the spatial distribution of the karst conduit network. Our approach can assist in the integration of soft information into the parametrization of karst groundwater models.
    Description: Bundesministerium für Bildung und Forschung http://dx.doi.org/10.13039/501100002347
    Description: https://doi.org/10.14279/depositonce-16021
    Keywords: ddc:551 ; karst conduit modeling ; stochastic modeling ; structural uncertainty ; karst probability mapping ; groundwater modeling
    Language: English
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  • 3
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    Basin‐scale estimates of greenhouse gas emissions from the Mara River, Kenya: Importance of discharge, stream size, and land use/land cover (2022)
    Mwanake, Ricky M. ; Gettel, Gretchen M. ; Ishimwe, Clarisse ; [et al.]
    John Wiley & Sons, Inc. | Hoboken, USA
    Details
    Publication Date: 2022-10-04
    Description: Greenhouse gas fluxes (CO2, CH4, and N2O) from African streams and rivers are under‐represented in global datasets, resulting in uncertainties in their contributions to regional and global budgets. We conducted year‐long sampling of 59 sites in a nested‐catchment design in the Mara River, Kenya in which fluxes were quantified and their underlying controls assessed. We estimated annual basin‐scale greenhouse gas emissions from measured in‐stream gas concentrations, modeled gas transfer velocities, and determined the sensitivity of up‐scaling to discharge. Based on the total annual CO2‐equivalent emissions calculated from global warming potentials (GWP), the Mara basin was a net greenhouse gas source (294 ± 35 Gg CO2 eq yr−1). Lower‐order streams (1–3) contributed 81% of the total fluxes, and higher stream orders (4–8) contributed 19%. Cropland‐draining streams also exhibited higher fluxes compared to forested streams. Seasonality in stream discharge affected stream widths (and stream area) and gas exchange rates, strongly influencing the basin‐wide annual flux, which was 10 times higher during the high and medium discharge periods than the low discharge period. The basin‐wide estimate was underestimated by up to 36% if discharge was ignored, and up to 37% for lower stream orders. Future research should therefore include seasonality in stream surface areas in upscaling procedures to better constrain basin‐wide fluxes. Given that agricultural activities are a major factor increasing riverine greenhouse gas fluxes in the study region, increased conversion of forests and agricultural intensification has the possibility of increasing the contribution of the African continent to global greenhouse gas sources.
    Description: Deutscher Akademischer Austauschdienst http://dx.doi.org/10.13039/501100001655
    Description: IHE Delft Institute for Water Education
    Description: Federal Ministry of Education and Research http://dx.doi.org/10.13039/501100002347
    Description: Helmholtz Association http://dx.doi.org/10.13039/501100009318
    Description: TERENO Bavarian Alps/ Pre‐Alps Observatory
    Keywords: ddc:551
    Language: English
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  • 4
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    Variability in the Concentration of Lithium in the Indo‐Pacific Ocean (2022)
    Details
    Publication Date: 2022-10-04
    Description: Lithium has limited biological activity and can readily replace aluminium, magnesium and iron ions in aluminosilicates, making it a proxy for the inorganic silicate cycle and its potential link to the carbon cycle. Data from the North Pacific Ocean, tropical Indian Ocean, Southern Ocean and Red Sea suggest that salinity normalized dissolved lithium concentrations vary by up to 2%–3% in the Indo‐Pacific Ocean. The highest lithium concentrations were measured in surface waters of remote North Pacific and Indian Ocean stations that receive relatively high fluxes of dust. The lowest dissolved lithium concentrations were measured just below the surface mixed layer of the stations with highest surface water concentrations, consistent with removal into freshly forming aluminium rich phases and manganese oxides. In the North Pacific, water from depths 〉2,000 m is slightly depleted in lithium compared to the initial composition of Antarctic Bottom Water, likely due to uptake of lithium by authigenically forming aluminosilicates. The results of this study suggest that the residence time of lithium in the ocean may be significantly shorter than calculated from riverine and hydrothermal fluxes.
    Description: Key Points: Li/Na ratios vary by up to 2%–3% in the Indian and Pacific Oceans. Authigenic formation of aluminosilicates slightly deplete deep‐water lithium concentrations in the North Pacific. The residence time of lithium in the ocean is 240,000 ± 70,000 years, based on removal from North Pacific deep‐water.
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: MoES, Indian National Centre for Ocean Information Services http://dx.doi.org/10.13039/501100004814
    Description: National Science Foundation USA
    Description: https://doi.pangaea.de/10.1594/PANGAEA.941888
    Keywords: ddc:551
    Language: English
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  • 5
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    Leaf Wax Hydrogen Isotopes as a Hydroclimate Proxy in the Tropical Pacific (2021)
    Details
    Publication Date: 2022-04-07
    Description: Hydrogen isotope ratios of sedimentary leaf waxes (δ2HWax values) are increasingly used to reconstruct past hydroclimate. Here, we add δ2HWax values from 19 lakes and four swamps on 15 tropical Pacific islands to an updated global compilation of published data from surface sediments and soils. Globally, there is a strong positive linear correlation between δ2H values of mean annual precipitation (δ2HP values) and the leaf waxes n‐C29‐alkane (R2 = 0.74, n = 665) and n‐C28‐acid (R2 = 0.74, n = 242). Tropical Pacific δ2HWax values fall within the predicted range of values based on the global calibration, and the largest residuals from the global regression line are no greater than those observed elsewhere, despite large uncertainties in δ2HP values at some Pacific sites. However, tropical Pacific δ2HWax values in isolation are not correlated with estimated δ2HP values from isoscapes or from isotope‐enabled general circulation models. Palynological analyses from these same Pacific sediment samples suggest no systematic relationship between any particular type of pollen distribution and deviations from the global calibration line. Rather, the poor correlations observed in the tropical Pacific are likely a function of the small range of δ2HP values relative to the typical residuals around the global calibration line. Our results suggest that δ2HWax values are currently most suitable for use in detecting large changes in precipitation in the tropical Pacific and elsewhere, but that ample room for improving this threshold exits in both improved understanding of δ2H variability in plants, as well as in precipitation.
    Description: Plain Language Summary: Past precipitation patterns are difficult to reconstruct, limiting our ability to understand Earth’s climate system. Geochemists reconstruct past precipitation by measuring the amount of heavy hydrogen naturally incorporated into the waxy coating of leaves, which is preserved in mud that accumulates in lakes, soils, and oceans. Heavy hydrogen in leaf waxes is strongly correlated with local precipitation, allowing us to learn about rainfall intensity, temperature, and cloud movement. However, no existing calibration studies include sites from the tropical Pacific, home to the most intense rainfall on the planet and populations that rely on rain for drinking water and farming. We measured heavy hydrogen in leaf waxes from tropical Pacific islands and show that although values are within the global calibration error, no precipitation relationship exists within the region. Plant type distributions do not explain the lack of correlation, which is best attributed to poorly constrained estimates of heavy hydrogen in local rain and the relatively small range of variability within the region. At present, heavy hydrogen from ancient leaf waxes can show large changes in past precipitation, but improved process‐level understanding is needed to use this tool to understand smaller changes in the tropical Pacific and elsewhere.
    Description: Key Points: Leaf wax 2H/1H ratios are correlated with mean annual precipitation 2H/1H ratios globally, but not in the tropical Pacific. Deviations from the global relationship between precipitation leaf wax 2H/1H ratios cannot be predicted from palynological assemblages. Small range and large uncertainties in estimates of tropical Pacific precipitation 2H/1H ratios likely account for poor correlations.
    Description: Swiss National Science Foundation
    Description: National Science Foundation (NSF) http://dx.doi.org/10.13039/100000001
    Description: Natural Environment Research Council (NERC) http://dx.doi.org/10.13039/501100000270
    Description: Department of Education and Training, Australian Research Council (ARC) http://dx.doi.org/10.13039/501100000923
    Description: http://10.0.15.89/ethz-b-000412154
    Keywords: ddc:551 ; ddc:577.7
    Language: English
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  • 6
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    Calcareous nannofossils of the Tertiary Flysch (Post Eocene to Early Miocene) of the Ionian Zone in Epirus, NW-Greece: taxonomy and biostratigraphical correlations (1997)
    Selbstverlag Fachbereich Geowissenschaften, FU Berlin
    In:  Herausgeberexemplar
    Details
    Publication Date: 2024-04-17
    Description: The present study considered calcareous nannofossils from material represented by outcrops of Flysch successions of the External Hellenides belt in the area of the Ionian Zone (I.Z.), northwestern Greece. The studied outcrops are located in Epirus mainland and the Ionian island Korfu. Three subdivisions have been traditionally in literature distinguished in the I.Z., the Internal, Middle and External (moving from east to the west), each of which was subsequently recognized in the Flysch deposits as well. Aim of the study was, a refinement of the current biostratigraphic resolution of the area through detailed taxonomic descriptions and consequently, a reliably better correlation of the investigated sedimentary deposits with the help of calcareous nannofossils. The biostratigraphic data were also processed semiquentitatively (frequency variations and distributions), in order to accurately determine important biohorizons. For this purpose, the nannofossils were studied under the LM and the SEM, from ten closely sampled sections representing clastic sequences of all the three subdivisions of the I.Z. The investigated sections are situated at about 39° northern mid latitudes, a fact which resulted to mixed nannoflora assemblages of low and high latitudes character. The sections are namely: Elatos, Korfovouni (Internal I.Z. subdivision), Kato Despotiko, Strouga Goumenou and Ekklisia (Middle I.Z. subdivision), lower and upper Argyrotopos, National Road, Monos and Anacharavi (External I.Z. subdivision). They were found to range in age from the latest Eocene to the Early Miocene. Based on the systematic palaeontology, 107 species of calcareous nannofossils were observed and documented in the studied material. Among them, a new species Rhabdosphaera epirotica sp. nov. was described, and four recombinations were proposed. Moreover, two calcareous dinoflagellate cysts, Cervisiella saxea and Obliquipithonella sp. were reported for the first time from the I.Z. in Greece. Despite the mid latitude palaeogeographic position of the sections, all the conventional calcareous nannofossil zonal markers for the Oligocene and Early Miocene were recorded, although some in fewer abundances than in low latitudes. Improving the biostratigraphic reliability, a new zonational scheme was here developed and proposed for the Oligocene to Early Miocene interval. It was mainly established on use of redefined biohorizons and composed of five zones and five subzones following below: 1. Latest Eocene: Ericsonia formosa Partial-range Zone, 2. Oligocene: llselithina fusa / Ericsonia formosa Concurrent-range Zone, Ericsonia formosa-Reticulofenestra umbilicus/R. hillae Interval Zone, Cyclicargolithus abisectus Partial-range Zone, including the subzones: Rhabdosphaera spp. Interval Subzone, and Sphenolithus predistentus Interval Subzone, Reticulofenestra scissura Interval Zone, including the Sphenolithus delphix Abundance Subzone, and 3. Earliest Miocene: Triquetrorhabdulus spp. Partial-range Subzone Sphenolithus conicus Interval Subzone. Based on a new biohorizon of the absolute First Occurrence (FO) of llselithina fusa, the Eocene/Oligocene (E/O) boundary was identified in the lower part of the Argyrotopos section. On the absence of disc-shaped discoasters, the I. fusa biohorizon represented a better approximation of the boundary, which was clearly correlated with the other studied sections of the three subdivisions of the I.Z. The Oligocene/Miocene (O/M) boundary was identified in the Monos section located in the Plataria syncline (External I.Z.), but Early Miocene strata were recorded in the Middle I.Z. as well. This boundary was placed at the Last Common Occurrence (LCO) biohorizon of the Reticulofenestra scissura. Moreover, six associate bioevents were reported near the O/M boundary, among them the highest occurrence of I. fusa, located above the boundary, in the Anacharavi section of Korfu island (western part of the External I.Z.). For the first time were evaluated reworked together with „autochton“ taxa of calcareous nannofossils in Greece. Maximum diversity values along each of the studied sections, have shown increased reworking and erosional processes in the Internal subdivision of the I.Z. than in the Middle and the External ones. This is interpreted to be connected with the higher tectonic instability along the Pindos thrust to the east, in relation to the central and western parts of the Ionian basin mainly during the Oligocene.
    Description: Die der vorliegenden Arbeit zugrundeliegenden kalkigen Nannofossilien stammen von Flyschabfolgen der Externen Helleniden (Ionische Zone) Nordwest-Griechenlands.So wurden in die Untersuchung Aufschlüsse des Festlandes in Epirus und der Ionischen Insel Korfu aus dem stratigraphischen Intervall vom obersten Eozän bis zum untersten Miozän einbezogen. Die Ionische Zone (I.Z.) wird traditionell von Osten nach Westen in die Interne, Mittlere und Externe Subzone unterteilt. Diese Einteilung läßt sich auch auf die Flyschablagerungen übertragen. Ziel der Arbeit ist eine Verfeinerung der bestehenden Biostratigraphie durch detaillierte taxonomische Beschreibungen, um damit eine bessere Korrelation der untersuchten Ablagerungen mit Hilfe der kalkigen Nannofossilien zu erreichen. Mit einer halbquantitativen Erfassung der biostratigraphischen Daten (Häufigkeitsvariation und -Verteilung) gelingt es darüberhinaus, einzelne Biohorizonte genauer zu definieren. Zu diesem Zwecke wurde das kalkige Nannoplankton von zehn eng-beprobten Profilen aus klastischen Abfolgen aller drei Subzonen der I. Z. unter dem Licht- und Elektronenmikroskop (REM) untersucht. Die Profile im einzelnen sind: Elatos und Korfovouni (Interne Subzone), Kato Despotiko, Strouga Goumenou und Ekklisia (Mittlere Subzone), Unter bzw. Ober Argyrotopos, National Road, Monos und Anacharavi (Externe Subzone). Zur Ablagerungszeit befanden sich die untersuchten Profile in einer nördlichen Paläobreite um 39°, was zu einer gemischten Nannoflora aus charakteristischen Vertretern niedriger und höherer Breiten führte. In dem untersuchten Material konnten insgesamt 107 Spezies von kalkigem Nannoplankton gefunden und dokumentiert werden. Die Art Rhabdosphaera epirotica nov. sp.wird neu beschrieben und vier Rekombinationen werden vorgeschlagen. Darüberhinaus konnten zwei kalkige Dinoflagellatenzysten Cervisiella saxea und Obliquipithonella sp. zum ersten Mal in der I.Z. nachgewiesen werden. Trotz der paläogeographischen Position der Profile in mittleren Paläobreitenbereich konnten alle konventionellen Zonenleitformen des kalkigen Nannoplanktons für das Oligozän und das Untermiozän gefunden werden, einige davon jedoch in geringerer Häufigkeit als in den niedrigeren Breiten. Durch die Verbesserung der biostratigraphischen Genauigkeit wird hier ein neues mediterranes Zonenschema für das Oligozän und das Untermiozän entwickelt, das im wesentlichen auf neu definierten Biohorizonten basiert. Es enthält fünf Zonen und fünf Subzonen: 1. Jüngstes Eozän: Ericsonia formosa Partial-range Zone, 2. Oligozän: llselithina fusa/Ericsonia formosa Concurrent-range Zone, Ericsonia formosa-Reticulofenestra umbilicus/R. hillae Interval Zone, Cyclicargolithus abisectus Partial-range Zone, gegliedert in den Subzonen: Rhabdosphaera spp. Interval Subzone, und Sphenolithus predistentus Interval Subzone, Reticulofenestra scissura Interval Zone, die eine Subzone enthält: Sphenolithus delphix Abundance Subzone, und 3. Ältestes Miozän: Triquetrorhabdulus spp. Partial-range Subzone Sphenolithus conicus Interval Subzone. Mit dem ersten Auftreten (FO) von llselithina fusa wird ein neuer Biohorizont definiert, mit dem die Grenze Eozän/Oligozän (E/O) in dem unteren Teil des Argyrotopos-Profils nachgewiesen wird. Trotz der Abwesenheit von scheibenförmigen Discoasteriden läßt sich nun diese Grenze mit dem I. fusa-Biohorizont besser fassen und kann eindeutig mit den Profilen in den beiden anderen Subzonen der I.Z. korreliert werden. Die Oligozän/Miozän-Grenze (O/M) konnte im Monos-Profil der Plataria-Synklinale (Externe I.Z.) charakterisiert werden. Untermiozän ließ sich aber auch in der Mittleren Subzone nachweisen. Die Grenze O/M ist durch das letzte Vorkommen (LCO) von Reticulofenestra scissura bestimmt. Sechs assoziierte Bioevents fallen in diesen Grenzbereich, darunter im Anacharavi-Profil der Insel Korfu (Westteil der Externen Subzone) das jüngste Vorkommen von I. fusa, unmittelbar über der Grenze O/M. Zum erstem Mal für Griechenland konnten aufgearbeitete Taxa von kalkigen Nannofossilien zusammen mit den autochthonen Taxa nachgewiesen werden. Ein Vergleich der maximalen Diversitätswerte in den untersuchten Profilen zeigt eine signifikant höhere Aufarbeitungsrate in der Internen Subzone gegenüber der Mittleren und Externen Subzonen. Dieser Umstand dürfte mit der höheren tektonischen Instabilität entlang der Pindos-Decken-Front im Osten des Arbeitsgebietes Zusammenhängen.
    Description: thesis
    Description: DFG, SUB Göttingen
    Keywords: ddc:560 ; Tertiär ; Flysch ; Nannofossil ; Biostratigraphie ; Systematik ; Paläobiologie ; Paläontologie
    Language: English
    Type: doc-type:book
    Format: 206
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