81 research outputs found

    Stratigraphy and palynology of the Pennsylvanian continental Buçaco Basin (NW Iberia)

    Get PDF
    The Buçaco Basin is a Pennsylvanian continental basin located along an important NNW–SSE strike structure (Porto-Tomar-Ferreira do Alentejo shear zone) that separates the Ossa-Morena and Central Iberian Zones of the Iberian Variscan Fold Belt in central western Portugal. The shear zone controlled the sedimentation in the basin and probably its post-sedimentary evolution. Sedimentation is initially alluvial with characteristic red sandstones, breccias and conglomerates. A gradual change to a fluvial (and probably lacustrine) type of sedimentation is observed with finning-upward cycles of gravel conglomerates, sandstones and organic-rich mudstones with occasional coal seams. Three representative sections were sampled for palynology and seventeen samples yielded sporomorphs with moderate to poor preservation. The palynological content from the alluvial sediments shows low diversity and poorly preserved assemblages dominated by Triquitrites spp., Densosporites spp., Laevigatosporites spp., and other taxa associated with siliciclastic environments or rheophytic mires. The fluvial and lacustrine sediments show a dramatic increase in diversity with an abundant, typical peatland microflora including sporomorphs such as Endosporites spp., Lycospora spp. and Monoletes spp., but also marginal peat and siliciclastic substrate taxa such as Densosporites spp., Latensina/Cordaitina spp., and Florinites spp. Other common taxa are Cheiledonites spp., Crassispora spp., Dictyotriletes-like miospores (mostly fragments), Potonieisporites spp., and Wilsonites spp. The presence and considerable abundance of Potonieisporites novicus and Cheiledonites cf. major is indicative of the middle to upper Potonieisporites novicus-bhardwajii–Cheiledonites major (NBM) miospore biozone of Western Europe, corresponding to the late Stephanian (early Gzhelian).publishe

    First Ediacaran (Vendian) cryptarchs from the Měnín-1 borehole (South Moravia)

    Get PDF
    Unicellular microfossils built by the polymeric organic wall have been detected in so-called basal clastics in southern Moravia. Microfossils have been studied as a palynological residuum, in SEM observation and in thin sections. 30 genera with 40 species have been preliminarily identified. Microfossils are distinguished by an excellent preservation (TAI about 1+) and diversification. Recovered assemblages correspond to the microbial flora of the Meso- and Neo-Proterozoic age.Unicellular microfossils built by the polymeric organic wall have been detected in so-called basal clastics in southern Moravia. Microfossils have been studied as a palynological residuum, in SEM observation and in thin sections. 30 genera with 40 species have been preliminarily identified. Microfossils are distinguished by an excellent preservation (TAI about 1+) and diversification. Recovered assemblages correspond to the microbial flora of the Meso- and Neo-Proterozoic age

    First Appearance Datums (FADs) of selected acritarch taxa and correlation between Lower and Middle Ordovician stages

    Get PDF
    First Appearance Datums (FADs) of selected, easily recognizable acritarch morphotypes are assessed to determine their potential contribution to correlation between Lower and Middle Ordovician stages and substage divisions along the Gondwanan margin (Perigondwana) and between Perigondwana and other palaeocontinents. The FADs for 19 genera, species and species groups are recorded throughout their biogeographical ranges. The taxa investigated fall into three groups. Some have FADs at about the same level throughout their biogeographical ranges and are useful for long‐distance and intercontinental correlation. Among these are Coryphidium, Dactylofusa velifera, Peteinosphaeridium and Rhopaliophora in the upper Tremadocian Stage; Arbusculidium filamentosum, Aureotesta clathrata simplex and Coryphidium bohemicum in the lower–middle Floian Stage; Dicrodiacrodium in the upper Floian Stage; Frankea in the Dapingian–lower Darriwilian stages; and Orthosphaeridium spp., with FADs in the Dapingian–lower Darriwilian stages of Perigondwanan regions and at about the same level in Baltica. Other taxa, however, have diachronous (or apparently diachronous) FADs, and this needs to be taken into account when using them for correlation. A second group of genera and species, comprising Striatotheca, the Veryhachium lairdii group and the V. trispinosum group, have a recurring pattern of FADs in the Tremadocian Stage on Avalonia and in South Gondwana and West Gondwana, but in the Floian Stage of South China and East Gondwana. The third group, consisting of Arkonia, Ampullula, Barakella, Dasydorus, Liliosphaeridium and Sacculidium, have FADs that are markedly diachronous throughout their biogeographical ranges, although the global FADs of Arkonia, Ampullula, Liliosphaeridium and Sacculidium are apparently in South China and/or East Gondwana. It is possible that diachronous FADs are only apparent and an artefact of sampling. Nevertheless, an alternative interpretation, suggested by recurring patterns, is that some as yet undetermined factor controlled a slower biogeographical spread over time, resulting in diachroneity

    Middle Ordovician acritarchs and problematic organic-walled microfossils from the Saq-Hanadir transitional beds in the QSIM-801 well, Saudi Arabia

    Get PDF
    Core samples from the QSIM-801 water well, drilled in central Saudi Arabia, cover a 93-foot interval spanning the transition between the Sajir Member of the Saq Formation, that consists mainly of sandstones of tidal sand flat environments, and the Hanadir Member of the Qasim Formation, characterized by argillaceous graptolitic mudstones, corresponding to a tidal delta front. The samples contain abundant, exceptionally well-preserved and diverse palynomorphs, which include cryptospores, acritarchs and chitinozoans, other problematic organic-walled microfossils as well as other organic particles such as cuticle-like fragments. The studied interval is biostratigraphically well constrained by the presence of chitinozoans of the formosa and pissotensis Zones of late-early to late Darriwilian age (Middle Ordovician) in the uppermost Saq Formation and Hanadir Member. The biostratigraphic age of the Sajir Member considered to span the Dapingian–Darriwilian boundary, is re-discussed based on the results herein. The uppermost part of the Sajir Member yielded the ichnofossil, Phycodes fusiforme. Acritarch assemblages from the Sajir Member of the Saq Formation are poorly diversified and dominated by sphaeromorphs. More diverse assemblages of acritarchs, associated with enigmatic forms, occur in the Hanadir Member of the Qasim Formation. The contact between the two formations and the transition between the palynomorph assemblages are sharp, suggesting a stratigraphic hiatus. A quantitative analysis allows us to discuss the paleoenvironmental changes and possibly climatic changes associated with an hypothesis of ice house conditions during this period. Among the diagnostic acritarch taxa observed are Frankea breviuscula, F. longiuscula, Baltisphaeridium ternatum, Dasydorus cirritus, Dicrodiacrodium ancoriforme, Poikilofusa ciliaris, Pterospermopsis colbathii and Uncinisphaera fusticula. These are associated with other typical forms known to range across the Lower–Middle Ordovician boundary, such as Aremoricanium rigaudae, Aureotesta clathrata, Barakella fortunata, B. rara, Baltisphaeridium klabavense, Glaucotesta latiramosa and Striatotheca spp. Galeate and peteinoid acritarchs are also well represented, as well as tiny forms of ultraplanctonic size. Three new species of acritarchs are proposed: Frankea longiuscula var. darriwilense var. nov, Micrhystridium regulum sp. nov, and Tyrannus proteus sp. nov. Repeated occurrences throughout the section of cryptospores, problematic microfossils such as organic filaments, cuticle-like tissues, striated and pigmented leiospheres frequently in clusters, are interpreted to reflect recurrent terrestrial and freshwater inputs in the depositional environment. Single-specimen, high-resolution analyses using Confocal Laser Scanning Microscopy on the enigmatic form Tyrannus proteus sp. nov. show fluorescence emission spectra and microstructural properties significantly different from those of typical marine acritarchs from the same levels

    Hitler´s unknown helper. The case of Ilse Koch.

    No full text
    The subject of this thesis is an analysis of Ilse Koch, a woman who grew up in the time of National Socialism in Germany and actively took part in running the concentration camp Buchenwald during the Second World War. She became well-known mainly because of her sadism and cruel actions she inflicted on innocent captives in the camp. Their own testimonies are key parts of the thesis. The aspects clearly proving Koch was to blame are named, on the other hand, there are also pointed out testimonies which defend her. To the complete narrative also belongs a description of the historical context, a part of which is a role of women in National Socialism and brief information about the concentration camp Buchenwald. The thesis is concluded by the author's reflection based on gained knowledge

    Comparison of book production produced by digital and classical printing techniques

    No full text
    Práce je věnována porovnání knižních publikací digitální a ofsetovou tiskovou technikou. Zabývá se stručným popisem výroby knižních publikací a jejich dokončováním. V praktická část se zabývá zhodnocením a porovnáním cen knižních publikací z hlediska výhodnosti tisku digitální a ofsetovou tiskovou technikou.The work is devoted to comparison of book publications with digital and offset printing technology. It deals with a brief description of the production of book publication and their completion. The practical part deals with the evaluation and comparison of the prices of book publications from the point of view of digital printing and offset printing technology.Fakulta chemicko-technologickáprof. Ing. Petr Němec, Ph.D. - Zodpovězte otázky oponenta. Kde je v práci nějaký experiment? prof. Ing. Michal Veselý, CSc. - Co jste myslela tím, že digitální stroje nedokáží tisknout speciálními barvami? prof. Ing. Michal Čeppan, CSc. - Co byly další proměnné, které jste porovnávala kromě tiskové techniky? Není rozptyl ve skupině digitální tisk větší než rozptyl mezi digitálním a ofsetovým tiskem?Dokončená práce s úspěšnou obhajobo

    The Ordovician acritarch genus Coryphidium

    Get PDF
    The acritarch genus Coryphidium Vavrdová, 1972 is one of the most frequently recorded acritarch taxa in the Ordovician. The original diagnoses, stratigraphical ranges and geographical distribution of all Coryphidium species are critically evaluated in a review of published literature supplemented by studies of material from the British Isles, Belgium, the Czech Republic, Germany, Spain, Morocco, Algeria, Tunisia, Libya and China, including sections from type areas. The taxonomic concept of the genus is here rationalized: the genus Coryphidium is emended and the informal category of coryphid acritarchs is introduced to include all morphotypes with the characteristic vesicle shape of the two genera Coryphidium and Vavrdovella Loeblich and Tappan, 1976. Nine of the previously described species can be attributed to the genus, and two other species possibly belong to it. The attribution to Coryphidium of the species C. sichuanense Wang and Chen, 1987 is rejected here. Intraspecific variability is very important and the attribution of Coryphidium specimens at the specific level is sometimes difficult. The genus is found in all palaeoenvironments from nearshore to offshore settings and apparently does not occupy specific palaeoecological niches. Coryphidium is very useful biostratigraphically and palaeobiogeographically. The review indicates that the genus first appears in the uppermost Tremadocian Araneograptus murrayi graptolite Biozone and is common through the upper Lower Ordovician and the Middle Ordovician, while Upper Ordovician occurrences might be the result of reworking. Palaeogeographically, Coryphidium is an indicator of the peri-Gondwanan acritarch “palaeoprovince” during the Early/Middle Ordovician

    Breastfeeding and the effect on children's health

    No full text
    Tato bakalářská práce se zabývá analýzou problematiky kojení a jeho vlivu na zdraví dětí, na základě analýzy a syntézy dat z dosud publikovaných českých i zahraničních literárních zdrojů. K vyhledávání českých literárních zdrojů byla použita elektronická databáze Medvik a pro vyhledávání zahraničních literárních zdrojů byla použita databáze PubMed. Ke sběru dat bylo využito také odborné periodikum Solen. Získaná data byla vytříděna na základě stanovených kritérií a použita pro potřeby této bakalářské práce.This bachelor thesis deals with the analysis of breastfeeding and its impact on children's health, based on the analysis and synthesis of data from previously published Czech and foreign literary sources. The electronic database Medvik was used to search for Czech literary sources, and the PubMed database was used to search for foreign literary sources. The scientific journal Solen was also used to collect data. The obtained data were sorted on the basis of set criteria and used for the needs of this bachelor thesis.Fakulta zdravotnických studiíStudent/ka úspěšně obhájil/a bakalářskou práci, odpověděl/a na doplňující otázky oponenta.Dokončená práce s úspěšnou obhajobo
    corecore