WorldWideScience

Sample records for palaeobotany

  1. Late Pleistocene Stratigraphy and Palaeobotany of the Isles of Scilly

    Science.gov (United States)

    Scourse, J. D.

    1991-12-01

    A re-evaluation of the Pleistocene stratigraphy of the Isles of Scilly has enabled the formal definition of eight lithostratigraphic units of member status grouped into two formations. A chronology of events has been provided by radiocarbon (14C) determinations, optical and thermoluminescene (TL) dates. Intersite correlations have been strengthened by palynology, which has aided palaeoenvironmental reconstruction. The defined units have been incorporated into two lithostratigraphic models, one for the `northern' (glacial) Scillies and one for the `southern' (extra-glacial) Scillies. Raised beach sediments of the Watermill Sands and Gravel in the southern Scillies are overlain by the Porthloo Breccia, a unit of soliflucted material derived exclusively from the weathering of local granite. Organic sequences at Carn Morval, Watermill Cove, Porth Askin, Porth Seal and Bread and Cheese Cove occur within the Porthloo Breccia, and are interpreted as the infillings of ponds associated with active solifluction. Radiocarbon determinations from these organic sediments are critical because they pre-date units associated with a glacial event. The 14C determinations indicate deposition of the organic material between 34500-800+885 (Q-2410) and 21500-800+890 (Q-2358) years BP and provide a maximum age for the glacial event and the first radiometric dates for the coastal `head' sediments of southwest England. The pollen assemblages from these organic sites all record open grassland vegetation, and represent the earliest vegetational record for the Scillies. High Pinus values are interpreted as evidence of climatic deterioration. In the southern Scillies, the Porthloo Breccia is overlain by the Old Man Sandloess, a coarse aeolian silt with subdominant fine sand, TL-dated to 18600-3700+3700 years (QTL-ld and lf; Wintle 1981) and optically dated to 20000-7000+7000 and 26000-9000+10000 years (two samples; 738al and 741al; Smith et al. 1990). This material occurs in a variety of facies related to different modes of reworking. In the northern Scillies, the Porthloo Breccia is overlain by three units that are all related to a single glacial event. The Scilly Till, a massive, poorly sorted, clay-rich pale brown diamicton containing abundant striated and faceted erratics of northern derivation, occurs at Bread and Cheese Cove, and Pernagie and White Island Bars. This sediment is of uncertain depositional facies, although the available data suggest that it may be a lodgement till. At Bread and Cheese Cove the Scilly Till occurs in association with a matrix-supported sandy gravel, the Tregarthen Gravel, which has an erratic assemblage consistent with the underlying Till. The distributional relation between the glacially derived sediments, marine bars and morphological varieties of granite tors suggest that some of the bars may be remnant moraines, and that the glacier was crosive in the northern Scillies. Aeolian loessic processes in association with the glacial advance resulted in the deposition of the Old Man Sandloess in the southern Scillies. The relative coarseness of this material is interpreted as a function of its proximity to glacially derived source material. The mineralogy of the Scilly Till is sufficiently similar to the Old Man Sandloess to suggest a genetic link between the two units. Overlying the Scilly Till and Tregarthen Gravel in the northern Scillies is the Hell Bay Gravel, an extremely widespread matrix-supported gravel containing a similar assemblage of striated and faceted erratics to the underlying Till, but alongside a considerable proportion of locally derived granitic material. The matrix of the Hell Bay Gravel is identical to colluvially reworked facies of the Old Man Sandloess. This material represents an initial phase of solifluction, post-dating the glacial event in which the Scilly Till, Tregarthen Gravel and Old Man Sandloess were mixed and transported downslope. In situations where these sediments were stripped from the land surface, weathered granite once again became the dominant raw material for solifluction, this subsequent phase being represented by the Bread and Cheese Breccia in the northern Scillies and the upper Porthloo Breccia in the southern Scillies. The evidence therefore suggests that ice advanced at least as far as the northern Isles of Scilly during the Dimlington Stadial of the late Devensian Substage. This conflicts with previous interpretations which place the glacial deposits within the Wolstonian Stage. However, the late Devensian event was probably not the first glacial event to have influenced the Islands because erratics are widespread in some exposures of the Watermill Sands and Gravel; the age of this earlier event remains uncertain.

  2. APORTES PALEOBOTÁNICOS EN LA RECONSTRUCCIÓN DE PALEODIETAS. ANÁLISIS DE COPROLITOS DEL CERRO CASA DE PIEDRA, SANTA CRUZ/Palaeobotany contributions in palaeodiets reconstruction. Coprolites analysis of Cerro Casa de Piedra, Santa Cruz.

    Directory of Open Access Journals (Sweden)

    Ana Cecilia Martínez Tosto

    2012-11-01

    Full Text Available Los coprolitos son heces fósiles deshidratadas o mineralizadas que contienen inclusiones orgánicas e inorgánicas. El estudio de las inclusiones de origen vegetal de los coprolitos permite conocer los ítems vegetales consumidos por los organismos e inferir la estacionalidad en el uso del sitio. El objetivo de este trabajo es estudiar el contenido de polen y de microrrestos vegetales de un coprolito humano del sitio CCP7 relacionado a una capa arqueológica fechada en 8920±200 C14 (UGA 7383 años AP. El sitio CCP7 está ubicado en la provincia de Santa Cruz (Argentina en el ecotono bosque-estepa. Se realizaron los análisis polínicos y microhistológicos de los restos vegetales del coprolito. Se identificaron 13 tipos polínicos, tres de ellos pertenecientes a la vegetación del bosque y el resto a la estepa. Mediante el análisis microhistológico se identificaron las especies Azorella monanthos, Empetrum rubrum y Gaultheria mucronata. El análisis simultáneo de la información extraída de los datos palinológicos y de los microhistológicos mostró coincidencias parciales entre el contenido de polen y de restos vegetales, permitiendo reconstruir la porción vegetal de la paleodieta e inferir la época del año en que el hombre que dio origen al coprolito estuvo ocupando el sitio CCP7.   Abstract Coprolites are dehydrated or mineralized fossil feces containing organic and inorganic inclusions. The study of plant inclusions of coprolites allows knowing the vegetable items consumed by organisms and inferring the seasonality in the use of the site. This work aims at studying pollen and plant remains from a human coprolite in the CCP7 site related to an archaeological layer dated from around 8920±200 14C (UGA 7383 years BP. CCP7 is located in the province of Santa Cruz (Argentina within the forest-steppe ecotone. Pollen and microhistological analyses of coprolite plant remains were conducted. Thirteen pollen types were identified: three from forest vegetation and the rest from the steppe. Azorella monanthos, Empetrum rubrum and Gaultheria mucronata were identified by means of microhistological analysis. Simultaneous microhistological and palynological data analysis showed partial matches between the content of pollen and plant remains, which helped to rebuild the palaeodiet plant portion and infer the time of year that the person who produced the coprolite was occupying the CCP7 site.

  3. Fulltext PDF

    Indian Academy of Sciences (India)

    the third child of his parents, Ruchi Ram Sahni and Ishwar Devi. ... devoted fully to the welfare of the family. Thus, ... Birbal Sahni's strategy of development of palaeobotany in all ... ized the importance of geology to palaeobotany and went on to ...

  4. New Fellows and Honorary Fellow

    Indian Academy of Sciences (India)

    Lucknow), FNA, FNASc. Date of birth: 5 August 1923. Date of death: 19 January 2012. Specialization: Cenophytic Palaeobotany and Palynology Last known address: B-21, Sector A, Mahanagar, Lucknow 226 006. YouTube; Twitter; Facebook; Blog ...

  5. Sur, a former late-glacial and Holocene lake at the westernmost margin of the Carpathians

    Czech Academy of Sciences Publication Activity Database

    Petr, L.; Žáčková, P.; Matys Grygar, Tomáš; Píšková, Anna; Křížek, M.; Treml, V.

    2013-01-01

    Roč. 85, č. 3 (2013), s. 239-263 ISSN 0032-7786 Institutional support: RVO:61388980 Keywords : Geochemistry * Geomorphology * Multi-proxy reconstruction * Palaeobotany * Palaeolimnology * Pannonia Subject RIV: DD - Geochemistry Impact factor: 2.778, year: 2013

  6. New Fellows and Honorary Fellow

    Indian Academy of Sciences (India)

    ... Pramana – Journal of Physics · Proceedings – Mathematical Sciences · Resonance – Journal of Science Education · Sadhana · Current Science ... Specialization: Palaeobotany, Pteridophytes and Plant Anatomy ... Summer Research Fellowship Programme 2018 ... Advanced Instructional School In Stochastic Processes.

  7. A new schizaeaceous fern, Schizaeopsis ekrtii sp nov., and its in situ spores from the Upper Cretaceous (Cenomanian) of the Czech Republic

    Czech Academy of Sciences Publication Activity Database

    Kvaček, J.; Dašková, Jiřina; Pátová, R.

    2006-01-01

    Roč. 140, 1-2 (2006), s. 51-60 ISSN 0034-6667 R&D Projects: GA ČR GA205/03/1267 Institutional research plan: CEZ:AV0Z30130516 Keywords : fern * palaeobotany * spores * Cenomanian Subject RIV: EF - Botanics Impact factor: 1.170, year: 2006

  8. Closing the gap between plant ecology and Quaternary palaeoecology

    Czech Academy of Sciences Publication Activity Database

    Reitalu, T.; Kuneš, Petr; Giesecke, T.

    2014-01-01

    Roč. 25, č. 5 (2014), s. 1188-1194 ISSN 1100-9233 EU Projects: European Commission(XE) 278065 - LONGWOOD Institutional support: RVO:67985939 Keywords : functional diversity * historical ecology * landscape reconstruction * palaeobotany Subject RIV: EF - Botanics Impact factor: 3.709, year: 2014

  9. Journal of Earth System Science | Indian Academy of Sciences

    Indian Academy of Sciences (India)

    Annual Meetings · Mid Year Meetings · Discussion Meetings · Public ... This paper presents the palynological results from the Barakar Formation of the Upper ... as palynoassemblages from South Victoria Land and Dronning Maud Land, ... Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, India.

  10. Review of monolete-producing Carboniferous-Permian sphenophylls

    Czech Academy of Sciences Publication Activity Database

    Libertín, M.; Bek, Jiří

    2008-01-01

    Roč. 2008, č. 2 (2008), s. 168-168 ISSN 0946-8978. [International Palynological Congress /12./ ; International Organisation of Palaeobotany Conference /8./. 30.08.2008-05.09.2008, Bonn] R&D Projects: GA AV ČR IAA300130503 Institutional research plan: CEZ:AV0Z30130516 Keywords : Carboniferous * Permian * sphenophylls Subject RIV: DB - Geology ; Mineralogy

  11. Vliv macerace na velikost megaspor Laevigatisporites glabratus (Zerndt) Pot. et Kr

    Czech Academy of Sciences Publication Activity Database

    Dašková, Jiřina

    2009-01-01

    Roč. 2008, - (2009), s. 91-92 ISSN 0514-8057 R&D Projects: GA AV ČR IAA304070701 Institutional research plan: CEZ:AV0Z30130516 Keywords : palynology * spores * palaeobotany * methods Subject RIV: DB - Geology ; Mineralogy http://www.geology.cz/zpravy/obsah/2008/2008-24.pdf

  12. Bajpai, Prof. Sunil

    Indian Academy of Sciences (India)

    ... Paleontology, Biostratigraphy and Paleobiogeography Address: Director, Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226 007, U.P.. Contact: Office: (0522) 274 0470, (0522) 274 0439. Fax: (0522) 274 0485. Email: directorbsip@gmail.com, director@bsip.res.in. YouTube · Twitter · Facebook ...

  13. Pohřebiště v Podolí u Brna a fenomén žárových hrobů mladší doby bronzové s rozměrnými jámami na Moravě

    Czech Academy of Sciences Publication Activity Database

    Parma, D.; Hajnalová, M.; Kala, J.; Kočárová, R.; Kos, P.; Křivánek, Roman

    2016-01-01

    Roč. 68, č. 3 (2016), s. 291-332 ISSN 0323-1267 Grant - others:GA ČR(CZ) GP14-33170P Institutional support: RVO:67985912 Keywords : Late Bronze Age * cremation burials * palaeobotany * anthropology * geophysical survey Subject RIV: AC - Archeology, Anthropology, Ethnology OBOR OECD: Archaeology

  14. New Fellows and Honorary Fellow

    Indian Academy of Sciences (India)

    Home; Fellowship. Fellow Profile. Elected: 1934 Section: Plant Sciences. Sahni, Birbal FNA 1934-49; Vice President 1934-49. Date of birth: 14 November 1891. Date of death: 10 April 1949. Specialization: Palaeobotany. YouTube; Twitter; Facebook; Blog ...

  15. Paleoekologický model prostředí ovlivněného říční sedimentací (duckmant, vnitrosudetská pánev)

    Czech Academy of Sciences Publication Activity Database

    Libertín, M.; Dašková, Jiřina

    2005-01-01

    Roč. 2004, - (2005), s. 79-81 ISSN 0514-8057 R&D Projects: GA AV ČR(CZ) IAA3013306 Institutional research plan: CEZ:AV0Z3013912 Keywords : palaeobotany * palaeoecology * Carboniferous * Duckmantian * Intrasudetic Basin * river environment Subject RIV: DB - Geology ; Mineralogy http://www.geology.cz/zpravy/obsah/2004/zpravy-o-vyzkumech-2004-str-079-81.pdf

  16. A biography and obituary of Alfred Traverse (1925–2015)

    OpenAIRE

    Riding, James B.; Chaloner FRS, William G.; Farley, Martin B.; Rich, Fredrick J.; Strother, Paul K.

    2016-01-01

    Professor Alfred (‘Al’) Traverse passed away following a long illness at 90 years of age on September 15th 2015 at Juniper Village, State College, Pennsylvania, USA. With his death, the twin sciences of palaeobotany and palynology have lost one of their most influential and productive of practitioners and teachers. He had a stellar student career, was a coal petrologist, an industrial palynologist and held parallel positions in the Episcopal (Anglican) church. However he is principally define...

  17. Recurrent abnormalities in conifer cones and the evolutionary origins of flower-like structures.

    Science.gov (United States)

    Rudall, Paula J; Hilton, Jason; Vergara-Silva, Francisco; Bateman, Richard M

    2011-03-01

    Conifer cones are reproductive structures that are typically of restricted growth and either exclusively pollen-bearing (male) or exclusively ovule-bearing (female). Here, we review two common spontaneous developmental abnormalities of conifer cones: proliferated cones, in which the apex grows vegetatively, and bisexual cones, which possess both male and female structures. Emerging developmental genetic data, combined with evidence from comparative morphology, ontogeny and palaeobotany, provide new insights into the evolution of both cones and flowers, and prompt novel strategies for understanding seed-plant evolution. Copyright © 2010 Elsevier Ltd. All rights reserved.

  18. How to quantify conduits in wood?

    Science.gov (United States)

    Scholz, Alexander; Klepsch, Matthias; Karimi, Zohreh; Jansen, Steven

    2013-01-01

    Vessels and tracheids represent the most important xylem cells with respect to long distance water transport in plants. Wood anatomical studies frequently provide several quantitative details of these cells, such as vessel diameter, vessel density, vessel element length, and tracheid length, while important information on the three dimensional structure of the hydraulic network is not considered. This paper aims to provide an overview of various techniques, although there is no standard protocol to quantify conduits due to high anatomical variation and a wide range of techniques available. Despite recent progress in image analysis programs and automated methods for measuring cell dimensions, density, and spatial distribution, various characters remain time-consuming and tedious. Quantification of vessels and tracheids is not only important to better understand functional adaptations of tracheary elements to environment parameters, but will also be essential for linking wood anatomy with other fields such as wood development, xylem physiology, palaeobotany, and dendrochronology.

  19. Grape and wine culture in Georgia, the South Caucasus

    Directory of Open Access Journals (Sweden)

    Maghradze David

    2016-01-01

    Full Text Available In 2014, the National Wine Agency of the Republic of Georgia initiated a three-year “Research Project for the study of Georgian Grapes and Wine Culture. Through collaborative research by Georgian and foreign institutions and researchers, the project aims to: stimulate research of Georgian viticulture and viniculture, through the lens of the country with the earliest tradition of grape domestication and winemaking; and to reconstruct the continuous development of viticulture and wine culture through time. The project advances the study of grape and wine culture by utilizing a multidisciplinary approach, including: archaeology, history, ethnography, molecular genetics, biomolecular archaeology, palaeobotany, ampelography, enology, climatology and other scientific fields. These studies are diachronic in their approach, beginning with the oldest Neolithic civilizations, to present day, creating a holistic understanding of the continuity and complexity of Georgian Wine Culture to help popularize Georgian Wine throughout the global wine market.

  20. [Lipids from fossil plants and their relation to modern plants. Example s of Cenomanian flora from Anjou and Bohemia].

    Science.gov (United States)

    Thanh, T N; Derenne, S; Largeau, C; Pons, D; Broutin, J; Mariotti, A; Bocherens, H

    2000-01-01

    Comparative analyses of lipids from fossil plants and from their extant counterparts were undertaken in order to test the taxonomic significance of lipids in palaeobotany. The comparison between lipids from a fossil Ginkgoaceae, Eretmophyllum andegavense, and its extant counterpart, Ginkgo biloba, revealed the presence of original molecules, dimethoxyalkylcoumarins, in lipids from both plants. Such compounds confirm, on chemical grounds the relationship between these extant and fossil Ginkgoaceaes. Moreover, differences in n-alkane distribution between E. andegavense and E. obtusum which are very similar morphologically, confirm that these fossil plants do not belong to the same species. Furthermore, comparative analyses of a fossil Cheirolepidiaceae, Frenelopsis alata, and its extant counterpart, the Cupressaceae Tetraclinis articulata, revealed some similarities between these two species although they do not belong to the same family. Otherwise, comparative analyses of fungi-infected and uninfected samples of F. alata demonstrated that these micro-organisms can significantly affect the chemical composition of fossil plant lipids. In conclusion, even if chemical analyses alone are not sufficient to determine the genus or species of a given fossil plant, they can precise the taxonomy of some specimens that have been previously studied by palaeobotanists.

  1. ARCHAEOBOTANY IN URBAN SITES: THE CASE OF MUTINA

    Directory of Open Access Journals (Sweden)

    R. Rinaldi

    2013-04-01

    Full Text Available The present paper aims to show the importance of analyzing plant macroremains from urban excavations. Organic materials preserved below the historical city in waterlogged conditions are a fundamental resource, and the study of seeds and fruits gives a good contribution to historical and archaeological research. Archaeobotany in urban contexts provides important results when the examined material comes from several excavations that "photograph" the territory over quite a long period. An overview of archaeobotanical analyses carried out on material from archaeological sites of Modena (Emilia-Romagna, from the 2nd century BC to the 6th century AD, made by the Laboratory of Palynology and Palaeobotany of the University of Modena and Reggio Emilia, is presented. The floristic list of seed/fruit analyses result is reported and interesting subject matters are tackled concerning both cultivated/cultivable plants (fruits and nuts, vegetables/aromatics/spices/medicinal plants, fibre and oil plants, cereals and pulses, flowers and other ornamental plants and wild plants of no obvious use, together with wetland plants which are rare and endangered species in Emilia-Romagna today.

  2. Improved age constraints for the retreat of the Irish Sea Ice Stream

    Science.gov (United States)

    Smedley, Rachel; Chiverrell, Richard; Duller, Geoff; Scourse, James; Small, David; Fabel, Derek; Burke, Matthew; Clarke, Chris; McCarroll, Danny; McCarron, Stephen; O'Cofaigh, Colm; Roberts, David

    2016-04-01

    BRITICE-CHRONO is a large (> 45 researchers) consortium project working to provide an extensive geochronological dataset constraining the rate of retreat of a number of ice streams of the British-Irish Ice Sheet following the Last Glacial Maximum. When complete, the large empirical dataset produced by BRITICE-CHRONO will be integrated into model simulations to better understand the behaviour of the British-Irish Ice Sheet in response to past climate change, and provide an analogue for contemporary ice sheets. A major feature of the British-Irish Ice Sheet was the dynamic Irish Sea Ice Stream, which drained a large proportion of the ice sheet and extended to the proposed southern limit of glaciation upon the Isles of Scilly (Scourse, 1991). This study will focus on a large suite of terrestrial samples that were collected along a transect of the Irish Sea basin, covering the line of ice retreat from the Isles of Scilly (50°N) in the south, to the Isle of Man (54°N) in the north; a distance of 500 km. Ages are determined for both the eastern and western margins of the Irish Sea using single-grain luminescence dating (39 samples) and terrestrial cosmogenic nuclide dating (10 samples). A Bayesian sequence model is then used in combination with the prior information determined for deglaciation to integrate the geochronological datasets, and assess retreat rates for the Irish Sea Ice Stream. Scourse, J.D., 1991. Late Pleistocene stratigraphy and palaeobotany of the Isles of Scilly. Philosophical Transactions of the Royal Society of London B334, 405 - 448.

  3. Leaves and fruits of Bauhinia (Leguminosae, Caesalpinioideae, Cercideae) from the Oligocene Ningming Formation of Guangxi, South China and their biogeographic implications.

    Science.gov (United States)

    Wang, Qi; Song, Zhuqiu; Chen, Yunfa; Shen, Si; Li, Zhenyu

    2014-04-24

    possible Tethys Seaway origin and spread of legumes. However, detailed scenarios for the historical biogeography of Bauhinia and its relatives still need more robust dataset from palaeobotany and molecular phylogeny in future research.

  4. The Eocene Arctic Azolla phenomenon: species composition, temporal range and geographic extent.

    Science.gov (United States)

    Collinson, Margaret; Barke, Judith; van der Burgh, Johan; van Konijnenburg-van Cittert, Johanna; Pearce, Martin; Bujak, Jonathan; Brinkhuis, Henk

    2010-05-01

    Azolla is a free-floating freshwater fern that is renowned for its rapid vegetative spread and invasive biology, being one of the world's fastest growing aquatic macrophytes. Two species of this plant have been shown to have bloomed and reproduced in enormous numbers in the latest Early to earliest Middle Eocene of the Arctic Ocean and North Sea based on samples from IODP cores from the Lomonosov Ridge (Arctic) and from outcrops in Denmark (Collinson et al 2009 a,b Review of Palaeobotany and Palynology 155,1-14; and doi:10.1016/j.revpalbo.2009.12.001). To determine the geographic and temporal extent of this Azolla phenomenon, and the spatial distribution of the different species, we have examined samples from 15 additional sites using material from ODP cores and commercial exploration wells. The sites range from the Sub-Arctic (Northern Alaska and Canadian Beaufort Mackenzie Basin) to the Nordic Seas (Norwegian-Greenland Sea and North Sea Basin). Our data show that the Azolla phenomenon involved at least three species. These are distinguished by characters of the megaspore apparatus (e.g. megaspore wall, floats, filosum) and the microspore massulae (e.g. glochidia fluke tips). The Lomonosov Ridge (Arctic) and Danish occurrences are monotypic but in other sites more than one species co-existed. The attachment to one another and the co-occurrence of megaspore apparatus and microspore massulae, combined with evidence that these spores were shed at the fully mature stage of their life cycle, shows that the Azolla remains were not transported over long distances, a fact which could not be assumed from isolated massula fragments alone. Our evidence, therefore, shows that Azolla plants grew on the ocean surfaces for approximately 1.2 million years (from 49.3 to 48.1 Ma) and that the Azolla phenomenon covered the area from Denmark northwards across the North Sea Basin and the whole of the Arctic and Nordic seas. Apparently, early Middle Eocene Northern Hemisphere middle

  5. Precisiones histológicas y bioquímicas acerca de los ejemplares de Frenelopsis procedentes de Torrelaguna (Madrid

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    Álvarez Ramis, C.

    1984-04-01

    Full Text Available Different morphological features of the Frenelopsis from a Torrelaguna bassin (Madrid, Spain are described and compared with F. alata and F. oligostomata , studied by other authors. The Frenelopsis rests present, in the studied deposit, a remarkable polymorphism with respect 10 the dimensions of the leaves, but all the specimens studied are greatiy related to F. oligostomata . The chemical study of the organic constituents of the cutic1es shows a heterogeneous composition, being the major constituents an alkali-insoluble cutinized residue and a likehumic acid polyphenolic extractable fraction, Cuticles contains a certain proportion of a highly alterated lignin-like polymer, and minimal amounts of fulvic acids, nitrogenated compounds, free hydrocarbons and carbohydrates. KEY WORDS: Hystology, Biochemistry, Frenelopsis, Upper cretaceous, Palaeobotany, Humic substances.

    Son descritos diferentes aspectos morfológicos de los Frenelopsis del yacimiento de Torrelaguna, comparándose sus características con las descritas por otros autores para las especies F. alata y F. oligostomata . Los restos de Frenelopsis presentan, en el yacimiento estudiado, un notable polimorfismo respecto a las dimensiones del fronde; pero todos los ejemplares descritos poseen características muy similares a las de F. oligostomata . El estudio químico de los constituyentes orgánicos de las cutículas muestra una composición compleja, siendo los componentes mayoritarios un residuo cutinizado insoluble en álcalis y una fracción polifenólica extraíble de características similares a los ácidos húmicos. Los restos presentan una cierta proporción de polímeros similares a la lignina, aunque muy alterada, así como pequeñas cantidades de ácidos fúlvicos, compuestos nitrogenados, hidrocarburos libres y carbohidratos.

  6. The Eocene Rusayl Formation, Oman, carbonaceous rocks in calcareous shelf sediments: Environment of deposition, alteration and hydrocarbon potential

    Energy Technology Data Exchange (ETDEWEB)

    Dill, H.G.; Wehner, H.; Kus, J. [Federal Institute for Geosciences and Natural Resources, P.O. Box 510163, D-30631 Hannover (Germany); Botz, R. [University Kiel, Geological-Paleontological Department, Olshausenstrasse 40-60, D-24118 Kiel (Germany); Berner, Z.; Stueben, D. [Technical University Karlsruhe, Institute for Mineralogy and Geochemistry, Fritz-Haber-Weg 2, D-76131 Karlsruhe (Germany); Al-Sayigh, A. [Sultan Qaboos University, Geological Dept. PO Box 36, Al-Khod (Oman)

    2007-10-01

    Paralic carbonaceous series intercalated among calcareous shelf sediments have seldom been investigated. During the early Eocene, calcareous and siliciclastic sediments were deposited on a wide shelf in front of low-reliefed hinterland in the Al Khawd region in NE Oman. The siliciclastic-calcareous sediments originated from strongly reworked debris of the Arabic Shield. The underlying Semail Ophiolite did not act as a direct source of debris but provided some heat to increase the maturity of carbonaceous rocks and modify the isotope signal of the calcareous minerals in the Rusayl Formation. A multidisciplinary approach involving sedimentology, mineralogy, chemistry, coal petrography and paleontology resulted in the establishment of nine stratigraphic lithofacies units and provides the reader with a full picture from deposition of the mixed carbonaceous-calcareous-siliciclastic rocks to the most recent stages of post-depositional alteration of the Paleogene formations. The calcareous Jafnayn Formation (lithofacies unit I) developed in a subtidal to intertidal regime, influenced episodically by storms. Deepening of the calcareous shelf towards younger series was ground to a halt by paleosols developing on a disconformity (lithofacies unit II) and heralding the onset of the Rusayl Formation. The stratigraphic lithofacies units III and IV reflect mangrove swamps which from time to time were flooded through washover fans from the open sea. The presence of Spinozonocolpites and the taxon Avicennia, which today belong to a coastal marsh vegetational community, furnish palynological evidence to the idea of extensive mangrove swamps in the Rusayl Formation [El Beialy, S.Y., 1998. Stratigraphic and palaeonenvironmental significance of Eocene palynomorphs from the Rusayl Shale Formation, Al Khawd, northern Oman. Review of Palaeobotany and Palynology 102, 249-258]. During the upper Rusayl Formation (lithofacies units V through VII) algal mats episodically flooded by marine

  7. Berliner Geowissenschaftlerinnen an der Friedrich-Wilhelms-Universität von 1906 bis 1945, eine Fallstudie

    Directory of Open Access Journals (Sweden)

    B. A. R. Mohr

    2003-01-01

    , as well as in the U.S.A. and Australia, the situation was similar in that women started late and in small numbers to study geology. This was, however, in contrast to Russia and later the Soviet Union where women were relatively early accepted even as university teachers. The data for this paper were gathered from Berlin University institutions, such as the historical archive and the library of the Palaeontological Institute, and in addition personal contacts were used. Women who had studied either geography, geology/palaeontology, geophysics, mineralogy or botany/palaeobotany are subject of this study. Only those are considered who had strong affiliations to geosciences proper, in all 17 women. During the first half of the 20th century the Berlin Friedrich-Wilhelms-University, founded in 1810, was one of the most important institutions concerning higher education in Germany, especially for women. The official opening of this university for women students was in 1908, somewhat later than at other German universities. Once admitted, however, the number of dissertations completed by women was relatively high, and, 30% of all habilitations (advanced degree which allows teaching at universities in Germany and 50% of all habilitations in the natural sciences were accomplished at Berlin between 1918/19 to 1932. The geosciences were, together with medicine, chemistry, physics, botany and zoology, very strong scientifical and in teaching. Geoscientists of international reputation worked at large institutions, affiliated or being part of the University, such as the Prussian (later German Geological Survey, the Institute of Geology and Palaeontology at the Museum of Natural History or the Institute and Museum of Oceanography, and were the advisers and reviewers of women Diploma and PhD students. doi:10.1002/mmng.20030060103

  8. The potential of pollen-based quantitative vegetation reconstructions in studies of past human settlements and use of resources - examples from Europe

    Science.gov (United States)

    Gaillard, Marie-Jose; Cui, Qiao-Yu; Lemdahl, Geoffrey; Trondman, Anna-Kari

    2015-04-01

    approach - the Landscape Reconstruction Algorithm (LRA) (3, 4) - makes it possible to estimate the cover of plant taxa or landscape units at both regional and local spatial scales using pollen records. The LRA has been tested and applied in various types of studies in Europe in particular. Examples from Europe and Scandinavia show that pollen-based quantitative reconstructions of vegetation cover, in combination with other palaeoecological records such as insect and plant macroremains, show the great potential of such studies to provide new insights on the use of landscapes and vegetation by humans in the past and its environmental consequences at both regional and local spatial scales (5, 6). These results provide a new environmental framework for the discussion and testing of hypotheses based on archaeological data. (1) Berglund, B.E. (1991) Ecological Bulletins 41: 1-495. (2) Gaillard, M.-J. et al. (1994) Review of Palaeobotany and Palynology 82: 47-73. (3) Sugita, S. (2007a) The Holocene 17: 243-257. (4) Sugita, S. (2007b) The Holocene 17: 229-241. (5) Cui, Q.-Y. et al. (2014) Ecology and Evolution, doi: 10.1002/ece3.1198 (6) Trondman, A.-K. (2014) Global Change Biology, doi: 10.1111/gcb.12737

  9. Palinologia holocênica do testemunho Bom Jesus, margem leste da ilha do Marajó, Pará, Amazônia Palynological study of Holocene sediments of Bom Jesus core, east margin of the Marajó Island, Pará, Amazonia

    Directory of Open Access Journals (Sweden)

    Lívia Cardoso da Silva Rodrigues

    2011-03-01

    Full Text Available A porção superior (1,25m do testemunho de sondagem Bom Jesus (TBJ, coletado no limite campo-mangue da Fazenda Bom Jesus, município de Soure, ilha do Marajó, Pará, Brasil, foi estudada através de análise palinológica de alta resolução objetivando a determinação da composição, abundância e diversidade de tipos polínicos bioindicadores de modificações na paleovegetação durante o Holoceno. 16 amostras sedimentares de 2cm³ foram tratadas de acordo com metodologia padrão em palinologia. Os programas Tilia e Tilia Graph foram utilizados para a construção dos diagramas palinológicos de abundância e concentração. A base do testemunho foi datada por 14C em 2730 ± 40 anos A.P. Foram definidas três zonas palinológicas. A presença de pólen de Rhizophora com abundância máxima de 88% apontou dominância de mangue ao longo de todo o testemunho sedimentar. Variações recorrentes na hidrodinâmica da baía do Marajó, caracterizadas por pulsos erosivos de curto período, parecem ter provocado redução na dominância de mangue. O incremento na abundância de tipos polínicos bioindicadores de campo inundável associados a elementos de restinga e floresta, evidenciam a migração do campo inundável sobre o manguezal. Os dados indicam correlação com outros registros polínicos holocênicos de transgressão marinha para a costa norte amazônica no Holoceno Superior.The upper portion (1.25 m of the sediment core Bom Jesus (TBJ, was collected in the field-mangrove limit of Bom Jesus Farm, municipality of Soure, island of Marajó, Pará, Brazil, was studied through pollen analysis high resolution aimed at determining the composition, abundance and diversity of the pollen types bioindicators of changes in the palaeobotany. 16 samples of sedimentary 2cm³ were treated according to standard methodology. Tilia and Tilia Graph software were used for to construct abundance and concentration palinological diagrams. The core base was

  10. Biomization and quantitative climate reconstruction techniques in northwestern Mexico—With an application to four Holocene pollen sequences

    Science.gov (United States)

    Ortega-Rosas, C. I.; Guiot, J.; Peñalba, M. C.; Ortiz-Acosta, M. E.

    2008-04-01

    New paleovegetation and paleoclimatic reconstructions from the Sierra Madre Occidental (SMO) in northwestern Mexico are presented. This work involves climate and biome reconstruction using Plant Functional Types (PFT) assigned to pollen taxa. We used fossil pollen data from four Holocene peat bogs located at different altitudes (1500-2000 m) at the border region of Sonora and Chihuahua at around 28° N latitude (Ortega-Rosas, C.I. 2003. Palinología de la Ciénega de Camilo: datos para la historia de la vegetación y el clima del Holoceno medio y superior en el NW de la Sierra Madre Occidental, Sonora, Mexico. Master Thesis, Universidad Nacional Autónoma de México, México D.F.; Ortega-Rosas, C.I., Peñalba, M.C., Guiot, J. Holocene altitudinal shifts in vegetation belts and environmental changes in the Sierra Madre Occidental, Northwestern Mexico. Submitted for publication of Palaeobotany and Palynology). The closest modern pollen data come from pollen analysis across an altitudinal transect from the Sonoran Desert towards the highlands of the temperate SMO at the same latitude (Ortega-Rosas, C.I. 2003. Palinología de la Ciénega de Camilo: datos para la historia de la vegetación y el clima del Holoceno medio y superior en el NW de la Sierra Madre Occidental, Sonora, Mexico. Master Thesis, Universidad Nacional Autónoma de México, México D.F.). An additional modern pollen dataset of 400 sites across NW Mexico and the SW United States was compiled from different sources (Davis, O.K., 1995. Climate and vegetation pattern in surface samples from arid western U.S.A.: application to Holocene climatic reconstruction. Palynology 19, 95-119, North American Pollen Database, Latin-American Pollen Database, personal data, and different scientific papers). For the biomization method (Prentice, I.C., Guiot, J., Huntley, B., Jolly, D., Cheddadi, R., 1996. Reconstructing biomes from paleoecological data: a general method and its application to European pollen data at 0 and