GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Dienerian (Early Triassic) Ammonoids from the Northern Indian Margin. (2019)
    Newark :John Wiley & Sons, Incorporated,
    Details
    Keywords: Paleontology-Triassic. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (244 pages)
    Edition: 1st ed.
    ISBN: 9781119522874
    Series Statement: Fossils and Strata Monograph Series
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=5646100
    Language: English
    Note: Fossils and Strata -- Dienerian (Early Triassic) ammonoids from the Northern Indian Margin -- Contents -- Present work -- Definitions of stages and substages -- Biochronology: the Unitary Association Method and terminology -- References -- Griesbachian and Dienerian (Early Triassic) ammonoids from the Salt Range, Pakistan -- Contents -- Introduction -- Geological framework -- Stratigraphy -- Lithology and ammonoid preservation -- Present work -- Biostratigraphy -- General subdivisions -- Griesbachian ammonoid faunas -- Hypophiceras cf. H. gracile Regional Zone -- Ophiceras connectens Regional Zone -- Ophiceras sakuntala Regional Zone -- Early Dienerian ammonoid faunas -- Gyronites dubius Regional Zone -- Gyronites plicosus Regional Zone -- Gyronites frequens Regional Zone -- Middle Dienerian ammonoid faunas -- Ambites atavus Regional Zone -- Ambites radiatus Regional Zone…… -- Ambites discus Regional Zone -- Ambites superior Regional Zone…… -- Ambites lilangensis Regional Zone… -- Late Dienerian ammonoid faunas -- Vavilovites cf. V. sverdrupi Regional Zone -- Kingites davidsonianus Regional Zone -- Koninckites vetustus Regional Zone -- Awanites awani Regional Zone -- Conclusion -- Systematic palaeontology by D. Ware and H. Bucher -- Classification -- The population approach: intraspecific variability and convergences -- Suture lines -- Ontogeny and growth allometry -- Systematic descriptions -- Superfamily Xenodiscaceae Frech, 1902 -- Family Xenodiscidae Frech, 1902 -- Genus Hypophiceras Trümpy, 1969 -- Hypophiceras aff . H. gracile (Spath, 1930) -- Superfamily Meekocerataceae Waagen, 1895 -- Family Ophiceratidae Arthaber, 1911 -- Genus Ophiceras Griesbach, 1880 -- Ophiceras connectens Schindewolf, 1954 -- Ophiceras sakuntala Diener, 1897 -- Genus Kyoktites n. gen -- Kyoktites hebeiseni n. sp -- Kyoktites cf. H. hebeiseni n. sp. , Genus Ghazalaites n. gen -- Ghazalaites roohii n. sp -- Ophiceratidae? n. gen. A n. sp. A -- Ophiceratidae? gen. et sp. indet -- Family Gyronitidae Waagen, 1895 -- Genus Gyronites Waagen, 1895 -- Gyronites frequens Waagen, 1895 -- Gyronites dubius (von Krafft , 1909) -- Gyronites rigidus (Diener, 1897) -- Gyronites plicosus Waagen, 1895 -- Gyronites sitala (Diener, 1897) -- Gyronites schwanderi n. sp -- Genus Ambites Waagen, 1895 -- Ambites discus Waagen, 1895 -- Ambites atavus (Waagen, 1895) -- Ambites tenuis n. sp -- Ambites radiatus (Brühwiler, Brayard, Bucher & -- Guodun, 2008) -- Ambites bojeseni n. sp -- Ambites subradiatus n. sp -- Ambites? sp. indet -- Ambites superior (Waagen, 1895) -- Ambites lilangensis (von Krafft, 1909) -- Ambites bjerageri n. sp -- Ambites cf. A. impressus (Waagen, 1895) -- Family Paranoritidae Spath, 1930 -- Genus Vavilovites Tozer, 1971 -- Vavilovites cf. V. sverdrupi (Tozer, 1963) -- Genus Koninckites Waagen, 1895 -- Koninckites vetustus Waagen, 1895 -- Koninckites khoorensis (Waagen, 1895) -- Genus Radioceras Waterhouse, 1996 -- Radioceras truncatum (Spath, 1934) -- Genus Pashtunites n. gen -- Pashtunites kraffti (Spath, 1934) -- Genus Awanites n. gen -- Awanites awani n. gen. et n. sp -- Genus Koiloceras Brühwiler & -- Bucher, 2012 -- Koiloceras sahibi n. sp -- Family Flemingitidae Hyatt, 1900 -- Genus Xenodiscoides Spath, 1930 -- Xenodiscoides? sp. indet -- Genus Shamaraites Shigeta & -- Zakharov, 2009 -- Shamaraites? sp. indet -- Family Proptychitidae Waagen, 1895 -- Genus Bukkenites Tozer, 1994 -- Bukkenites sakesarensis n. sp -- Genus Proptychites Waagen, 1895 -- Proptychites lawrencianus (de Koninck, 1863) sensu Waagen, 1895 -- Proptychites oldhamianus Waagen, 1895 -- Proptychites wargalensis n. sp -- Proptychites ammonoides Waagen, 1895 -- Proptychites cf. P. pagei Ware, Jenks, Hautmann &. , Bucher, 2011 -- Family Mullericeratidae Ware, Jenks, Hautmann & -- Bucher, 2011 -- Genus Mullericeras Ware, Jenks, Hautmann & -- Bucher, 2011 -- Mullericeras spitiense (von Krafft , 1909) -- Mullericeras shigetai n. sp -- Mullericeras indusense n. sp -- Mullericeras niazii n. sp -- Genus Ussuridiscus Shigeta & -- Zakharov, 2009 -- Ussuridiscus varaha (Diener, 1895) -- Ussuridiscus ensanus (von Krafft, 1909) -- Ussuridiscus ventriosus n. sp -- Ussuridiscus ornatus n. sp -- Ussuridiscus? sp. indet -- Family incertae sedis -- Genus Kingites Waagen, 1895 -- Kingites davidsonianus (de Koninck, 1863) -- Kingites korni Brühwiler, Ware, Bucher, Krystyn & -- Goudemand, 2010a -- Superfamily Sagecerataceae Hyatt, 1884 -- Family Hedenstroemiidae Hyatt, 1884 -- Genus Clypites Waagen, 1895 -- Clypites typicus Waagen, 1895 -- Genus Pseudosageceras Diener, 1895 -- Pseudosageceras simplelobatum n. sp -- Superfamily incertae sedis -- Family incertae sedis -- Genus Subacerites n. gen -- Subacerites friski n. sp -- Gen. et sp. indet -- Acknowlegdements -- References -- Plates 1 to 33 -- Dienerian (Early Triassic) ammonoids from Spiti, Himachal Pradesh, India -- Contents -- Introduction -- Geological framework -- Stratigraphy -- Lithology and ammonoid preservation -- Present work -- Biostratigraphy -- Early Dienerian ammonoid faunas -- Gyronites dubius Regional Zone -- Gyronites plicosus Regional Zone -- Gyronites frequens Regional Zone -- Middle Dienerian ammonoid faunas -- Ambites atavus Regional Zone -- Ambites bojeseni Regional Zone -- Ambites discus Regional Zone -- Ambites lilangensis Regional Zone -- Late Dienerian ammonoid faunas -- Vavilovites meridialis Regional Zone -- Kingites davidsonianus Regional Zone -- Koninckites vetustus Regional Zone -- Conclusion -- Systematic palaeontology by D. Ware and H. Bucher -- Family Ophiceratidae Arthaber, 1911. , Genus Ghazalaites Ware & -- Bucher, 2018b -- Ghazalaites roohii Ware & -- Bucher, 2018b -- Family Gyronitidae Waagen, 1895 -- Genus Gyronites Waagen, 1895 -- Gyronites frequens Waagen, 1895 -- Gyronites dubius (von Krafft , 1909) -- Gyronites plicosus Waagen, 1895 -- Gyronites sitala (Diener, 1897) -- Gyronites levilatus n. sp -- Gyronites bullatus n. sp -- Gyronites schwanderi Ware & -- Bucher, 2018b -- Genus Ambites Waagen, 1895 -- Ambites discus Waagen, 1895 -- Ambites atavus (Waagen, 1895) -- Ambites tenuis Ware & -- Bucher, 2018b -- Ambites bojeseni Ware & -- Bucher, 2018b -- Ambites radiatus (Brühwiler, Brayard, Bucher & -- Guodun, 2008) -- Ambites nyingmai n. sp -- Ambites subradiatus Ware & -- Bucher, 2018b -- Ambites cf. A. frechi (Tozer, 1994) -- Ambites lilangensis (von Krafft , 1909) -- Family Paranoritidae Spath, 1930 -- Genus Vavilovites Tozer, 1971 -- Vavilovites meridialis n. sp -- Genus Koninckites Waagen, 1895 -- Koninckites vetustus Waagen, 1895 -- Koninckites khoorensis (Waagen, 1895) -- Genus Radioceras Waterhouse, 1996 -- Radioceras truncatum (Spath, 1934) -- Genus Pashtunites Ware & -- Bucher, 2018b -- Pashtunites kraffti (Spath, 1934) -- Family Proptychitidae Waagen, 1895 -- Genus Proptychites Waagen, 1895 -- Proptychites lawrencianus (de Koninck, 1863) sensu Waagen, 1895 -- Proptychites oldhamianus Waagen, 1895 -- Proptychites wargalensis Ware & -- Bucher, 2018b -- Proptychites ammonoides Waagen, 1895 -- Proptychites cf. P. pagei Ware, Jenks, Hautmann & -- Bucher, 2011 -- Genus Bukkenites Tozer, 1994 -- Bukkenites sakesarensis Ware & -- Bucher in 2018b -- Genus Dunedinites Tozer, 1963 -- Dunedinites cf. D. magnumbilicatus (Kiparisova, 1961) -- Family Mullericeratidae Ware, Jenks, Hautmann & -- Bucher, 2011 -- Genus Mullericeras Ware, Jenks, Hautmann & -- Bucher, 2011. , Mullericeras spitiense (von Krafft, 1909) -- Mullericeras shigetai Ware & -- Bucher, 2018b -- Mullericeras niazii Ware & -- Bucher, 2018b -- Genus Ussuridiscus Shigeta & -- Zakharov, 2009 -- Ussuridiscus varaha (Diener, 1895) -- Ussuridiscus ensanus (von Krafft , 1909) -- Ussuridiscus ornatus Ware & -- Bucher, 2018b -- Ussuridiscus ventriosus Ware & -- Bucher, 2018b -- Family incertae sedis -- Genus Kingites Waagen, 1895 -- Kingites davidsonianus (de Koninck, 1863) -- Kingites korni Brühwiler, Ware, Bucher, Krystyn & -- Goudemand, 2010 -- Superfamily Sagecerataceae Hyatt, 1884 -- Family Hedenstroemiidae Hyatt, 1884 -- Genus Pseudosageceras Diener, 1895 -- Pseudosageceras simplelobatum Ware & -- Bucher, 2018b -- Acknowledgements -- References -- Plates 1 to 13 -- EULA.
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    GEOMAR EBL
  • 2
    facet.materialart.
    Unknown
    Oxygen isotope values from biogenic apatite (conodont elements and fish teeth) from the Lower Triassic Mianwali Formation (Salt Range, Pakistan) (2013)
    PANGAEA
    In:  Supplement to: Romano, Carlo; Goudemand, Nicolas; Vennemann, Torsten W; Ware, David; Schneebeli-Hermann, Elke; Hochuli, Peter A; Brühwiler, Thomas; Brinkmann, Winand; Bucher, Hugo (2013): Climate and biotic upheavals following the end-Permian mass extinction. Nature Geoscience, 6, 57-60, https://doi.org/10.1038/ngeo1667
    Details
    Publication Date: 2023-07-10
    Description: Recovery from the end-Permian mass extinction is frequently described as delayed, with complex ecological communities typically not found in the fossil record until the Middle Triassic epoch. However, the taxonomic diversity of a number of marine groups, ranging from ammonoids to benthic foraminifera, peaked rapidly in the Early Triassic. These variations in biodiversity occur amidst pronounced excursions in the carbon isotope record, which are compatible with episodes of massive CO2 outgassing from the Siberian Large Igneous Province. Here we present a high-resolution Early Triassic temperature record based on the oxygen isotope composition of pristine apatite from fossil conodonts. Our reconstruction shows that the beginning of the Smithian substage of the Early Triassic was marked by a cooler climate, followed by an interval of warmth lasting until the Spathian substage boundary. Cooler conditions resumed in the Spathian. We find the greatest increases in taxonomic diversity during the cooler phases of the early Smithian and early Spathian. In contrast, a period of extreme warmth in the middle and late Smithian was associated with floral ecological change and high faunal taxonomic turnover in the ocean. We suggest that climate upheaval and carbon-cycle perturbations due to volcanic outgassing were important drivers of Early Triassic biotic recovery.
    Keywords: Ammonoid zone; Bed; Calculated average/mean values; Geologic age name; Geological sample; GEOS; Lithologic unit/sequence; nammal_gorge; Nammal Gorge, Salt Range, northern Pakistan; Phase; Sigma; Species; δ18O, conodonts; δ18O, fish teeth
    Type: Dataset
    Format: text/tab-separated-values, 381 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 3
    Electronic Resource
    Electronic Resource
    Geology and palynology of the Triassic succession of Bjørnøya (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 8 (1990), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: The Triassic succession of Bjørnøya (200 m) comprises the Lower Triassic Urd Formation (65 m) of the Sassendalen Group, and the Middle and Upper Triassic Skuld Formation (135 m) of the Kapp Toscana Group. These units are separated by a condensed '.'Middle Triassic sequence represented by a phosphatic remainé conglomerate (0.2m).The Urd Formation consists of grey to dark grey shales with yellow weathering dolomitic beds and nodules. Palynology indicates the oldest beds to be Diencrian; ammonoid faunas in the middle and upper part of the formation arc of Smithian age. The organic content (c. 1 %) includes kerogen of land and marine origin, reflecting a shallow marine depositional environment.The Skuld Formation is dominated by grey shales with red weathering siderite nodules. There are minor coarsening upwards sequences; the highest bed exposed is a 20 m thick, very fine-grained sandstone. Palynomorphs indicate a late Ladinian age for the lower part of the formation, and macrofossils and palynomorphs indicate Ladinian to Carnian ages for the upper part. Sedimentary structures, a sparse marine fauna and microplankton indicate deposition in a shallow marine environment. The organic residues contain dominantly terrestrially derived kerogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.1990.tb00382.x
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Terrestrial carbon-isotope records from coastal deposits (Algarve, Portugal): a tool for chemostratigraphic correlation on an intrabasinal and global scale (2003)
    Oxford, UK : Blackwell Science Ltd
    Terra nova 15 (2003), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The carbon-isotope signature of terrestrial organic matter (OM) offers a valuable tool to develop stratigraphic correlations for near-shore deposits. A mid-Cretaceous coastal succession of the western Algarve Basin, Portugal, displays a marked negative δ13C excursion ranging from − 21.2‰ to − 27.8‰ in the Early Aptian followed by two shifts towards higher values (up to − 19.3‰) during the Early and Late Aptian, respectively. The dominance of cuticle and leaf debris in the bulk OM fraction is confirmed by optical studies, Rock-Eval pyrolysis and by comparison with the δ13C signature of four different types of fossilized land-plant particles. Correlation of two terrestrial δ13Cbulk OM records from different study sites leads to a significant enhancement of the intrabasinal stratigraphic correlation within the Algarve Basin. Three prominent excursions in the Portuguese records can be correlated with existing δ13C curves from pelagic and terrestrial environments. The general carbon-isotope pattern is superimposed by small-scale fluctuations which can be explained by compositional variations within the OM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3121.2003.00447.x
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Lower Cretaceous turbiditic sediments from the Rif chain (Northern Marocco) — palynology, stratigraphy and palaeogeographic setting (1984)
    Springer
    Geologische Rundschau 73 (1984), S. 1081-1114 
    Details
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract The paper describes the palynology, stratigraphy, sedimentology and palaeogeographic setting of Lower Cretaceous turbiditic and terrigenous deep-sea sediments at the Tethyan margins of Africa and Alboran (External Domain of the Rif, and Flysch Nappes). During the Early Cretaceous terrigenous turbiditic deep-water sedimentation characterizes two different palaeogeographic domains in the southern part of the western Tethys: In the northern area of the External Domain (Ketama Unit of the Rif) alternating turbiditic arenites and pelites are interpreted as sediments of a distal part of a fan system on the Tethyan margin of Africa. The main sources for the terrigenous material were situated in Central and Western Algeria; only little sand transited through the Prerif and the Mesorif zones of Morocco. The terrigenous sedimentation began in the Hauterivian, but the main turbiditic cycles are of Aptian to Lower and Middle Albian age. The Flysch Domain probably was situated far to the Northeast with respect to the Rif basin, at the western and southern margins of the Alboran microplate. Relatively proximal turbidites form most of the Tisirène Nappe, whereas more distal turbidites constitute the series of the Melloussa and the Chouamat Nappes. The existence of two different source areas is demonstrated, one to the NE and the other to the NW of the depositional area. The turbidites probably were deposited on a E-W oriented fan system which progradated into a longitudinal trench-like trough. In the Central Rif area, the Tisirène Flysch is of Valanginian to Albian (pre-Vraconian) age. In the Western Rif and in the Melloussa and Chouamat Nappes of the whole area no sediments older than Aptian have been found. The stratigraphy of the investigated series is based on a new tentative palynostratigraphic zonation, using pollen, spores and dinoflagellate cysts. Rich and well preserved assemblages have been found in the Western Rif only, whereas the samples of the Tisirène Nappe and the Chouamat Nappe in the Central and Eastern Rif have been affected by some thermal alteration. Black and mostly opaque palynomorphs from the Ketama Unit reflect the strong thermal influence in the External Domain of the Central and Eastern Rif.
    Abstract: Résumé On présente la palynologie, la stratigraphie, la sédimentologie et le cadre paléogéographique des sédiments turbiditiques et terrigènes en milieu marin profond sur les marges téthysiennes de l'Afrique et d'Alboran au Crétacé inférieur (Rif externe et Nappes des Flyschs, Maroc). Au cours du Crétacé inférieur, des sédiments terrigènes turbiditiques se trouvent dans deux domaines paléogéographiques du secteur sud de la terminaison occidentale de la Téthys: Dans le secteur septentrional du domaine externe rifain (unité de Ketama) des alternances de pétites et d'arénites sont interprétées en tant que dépôts distaux d'un cône sousmarin sur la marge téthysienne de l'Afrique. Les sources principales pour le matériel terrigène se trouvent en Algérie centrale et occidentale. Peu de matériel seulement a pu traverser la marge marocaine à travers le Mésorif et le Prérif. Dans le Domaine externe rifain, le début de la sédimentation terrigène se fait au cours de l'Hauterivien; les turbidites arénitiques sont essentiellement de l'Aptien et de l'Albien anté-Vraconien. Le Domaine des Flyschs était probablement situé largement au Nordest du bassin rifain, sur les marges sud et ouest de la plaque d'Alboran. Les faciès turbiditiques relativement proximaux sont associés à la nappe du J. Tisirène, alors que les faciès plus distaux dominent dans les nappes de Melloussa et de Chouamat. Deux sources sont responsables de la construction des corps sédimentaires des Flyschs: une première source était située au Nordouest et une autre au Nordest du domaine sédimentaire. Les cônes sous-marins profonds des Flyschs étaient orientés Est-Ouest; par progradation ils avancaient dans un bassin sédimentaire longitudinal de même orientation. Les turbidites débutent au Valanginien dans la série de Tisirène du Rif central; la sédimentation turbiditique se termine avant le Vraconien, au cours de l'Albien. Dans le Rif occidental et dans les nappes de Melloussa et de Chouamat du domaine entier aucun sédiment ne date d'avant l'Aptien. La stratigraphie des séries analysées est basée sur une nouvelle zonation provisoire par des pollen, des spores et des dinoflagellés. Des flores très riches et bien conservées ont été trouvées dans les Flyschs du Rif occidental. Les palynomorphes des Flyschs du Rif central et oriental en revanche ont été affectés par un léger métamorphisme. Un métamorphisme plus intense se manifeste par des palynomorphes noirs et souvent opaques dans l'unité de Ketama du Rif externe central et oriental.
    Notes: Zusammenfassung Von den afrikanischen und Alboran-Kontinentalrändern der westlichen Tethys (Externe Domäne und Flyschdecken im Rif, Nordmarokko) werden terrigene turbiditische Tiefseesedimente von Unterkreidealter beschrieben (Palynologie, Stratigraphie, Sedimentologie und paläogeographischer Rahmen). Während der Unterkreide finden sich terrigene turbiditische Tiefseeablagerungen in zwei verschiedenen paläogeographischen Räumen des Südteils der westlichen Tethys: Im Nordteil der Externen Domäne (Ketama-Einheit des Rif) werden Wechsellagerungen von Areniten und Peliten als distale Fan-Ablagerungen am tethydischen Kontinentalrand von Afrika gedeutet. Die wichtigsten Quellen für das detritische Material lagen in Zentral- und Westalgerien, am Südrand des Tell. Nur wenig Sand- und Tonmaterial stammt aus dem marokkanischen Vorland selbst, denn im südlich an die Ketama-Einheit anschließenden Mesorif und im Prärif fehlen proximale detritische Ablagerungen weitgehend. Im Rifbecken begann die detritische Sedimentation im Hauteriv; das Alter der wichtigsten sandigen Turbidite ist Apt bis Alb (prä-Vracon). Die Flyschdomäne lag in der Unterkreide vermutlich weit im Nordosten des Rifbekkens, am Süd- und Westrand der Alboran-Mikroplatte. Relativ proximale Turbidite finden sich in der Tisirène-Decke, etwas distalere Bildungen charakterisieren die Melloussa- und die Chouamat-Decke. Der Detritus der Tisirène-Decke wurde von zwei Quellen ins Flyschbecken geschüttet, wobei eine Quelle im Nordosten, die andere im Nordwesten des Ablagerungsraumes lag. Die turbiditischen Sedimente wurden vermutlich auf einem Ost-West orientierten Fan-System, das in einen longitudinalen Trog vorstieß, abgelagert. Im zentralen Rifgebirge ist das Alter des Tisirène-Flyschs Valang bis Oberes Alb (prä-Vracon). In den westlichen Aufschlüssen der Tisirène-Decke und in der Melloussa- und der Chouamat-Decke des ganzen Untersuchungsgebietes wurden keine Sedimente aus der Zeit vor dem Apt nachgewiesen. Die Stratigraphie der untersuchten Serien beruht auf einer provisorischen neuen Zonierung durch Pollen, Sporen und Dinoflagellaten. Formenreiche und gut erhaltene Florengemeinschaften wurden in allen Einheiten des westlichen Rifgebirges gefunden. Die Floren aus der Tisirène-Decke und der Chouamat-Decke des zentralen und östlichen Rif sind thermal etwas verändert. Schwarze, meist opake Palynomorphen in der Ketama-Einheit weisen auf die Wirkung der Metamorphose im zentralen und östlichen Rif hin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01820889
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    facet.materialart.
    Unknown
    Climate and vegetation history of western Portugal inferred from Albian near-shore deposits (Galé Formation, Lusitanian Basin) (2012)
    Cambridge University Press
    Details
    Publication Date: 2012-11-01
    Description: The late Early Cretaceous greenhouse climate has been studied intensively based on proxy data derived essentially from open marine archives. In contrast, information on continental climatic conditions and on the accompanying response of vegetation is relatively scarce, most notably owing to the stratigraphic uncertainties associated with many Lower Cretaceous terrestrial deposits. Here, we present a palynological record from Albian near-shore deposits of the Lusitanian Basin of W Portugal, which have been independently dated using Sr-isotope signals derived from low-Mg oyster shell calcite. 87Sr/86Sr values fluctuate between 0.707373 ± 0.00002 and 0.707456 ± 0.00003; absolute values and the overall stratigraphic trend match well with the global open marine seawater signature during Albian times. Based on the new Sr-isotope data, existing biostratigraphic assignments of the succession are corroborated and partly revised. Spore-pollen data provide information on the vegetation community structure and are flanked by sedimentological and clay mineralogical data used to infer the overall climatic conditions prevailing on the adjacent continent. Variations in the distribution of climate-sensitive pollen and spores indicate distinct changes in moisture availability across the studied succession with a pronounced increase in hygrophilous spores in late Early Albian times. Comparison with time-equivalent palynofloras from the Algarve Basin of southern Portugal shows pronounced differences in the xerophyte/hygrophyte ratio, interpreted to reflect the effect of a broad arid climate belt covering southern and southeastern Iberia during Early Albian times.
    Print ISSN: 0016-7568
    Electronic ISSN: 1469-5081
    Topics: Geosciences
    Published by Cambridge University Press
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...