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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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North Africa
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Morocco (1)
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Europe
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Central Europe
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Czech Republic
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Barrandian Basin (1)
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Bohemia
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Prague Basin (1)
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Western Europe
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United Kingdom
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Great Britain
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England (1)
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Wales
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Welsh Basin (1)
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elements, isotopes
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carbon
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C-13/C-12 (1)
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isotope ratios (1)
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isotopes
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stable isotopes
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C-13/C-12 (1)
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fossils
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Graptolithina
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Graptoloidea (1)
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Invertebrata
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Arthropoda
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Trilobitomorpha
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Trilobita
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Ptychopariida
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Proetidae (1)
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geochronology methods
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U/Pb (1)
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geologic age
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Paleozoic
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Devonian
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Middle Devonian
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Eifelian (1)
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Ordovician (1)
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Silurian
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Lower Silurian
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Llandovery
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Aeronian (1)
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Wenlock
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Homerian (1)
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Upper Silurian
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Ludlow (1)
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Pridoli (1)
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minerals
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silicates
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orthosilicates
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nesosilicates
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zircon group
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zircon (1)
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Primary terms
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absolute age (1)
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Africa
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North Africa
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Morocco (1)
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biogeography (1)
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carbon
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C-13/C-12 (1)
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Europe
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Central Europe
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Czech Republic
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Barrandian Basin (1)
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Bohemia
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Prague Basin (1)
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Western Europe
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United Kingdom
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Great Britain
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England (1)
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Wales
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Welsh Basin (1)
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geochemistry (1)
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Graptolithina
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Graptoloidea (1)
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Invertebrata
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Arthropoda
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Trilobitomorpha
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Trilobita
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Ptychopariida
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Proetidae (1)
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isotopes
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stable isotopes
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C-13/C-12 (1)
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paleoecology (1)
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Paleozoic
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Devonian
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Middle Devonian
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Eifelian (1)
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Ordovician (1)
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Silurian
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Lower Silurian
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Llandovery
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Aeronian (1)
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Wenlock
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Homerian (1)
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Upper Silurian
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Ludlow (1)
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Pridoli (1)
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sedimentary rocks
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bone beds (1)
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clastic rocks
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black shale (1)
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stratigraphy (1)
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sedimentary rocks
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sedimentary rocks
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bone beds (1)
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clastic rocks
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black shale (1)
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Reporyje
Late Silurian zircon U–Pb ages from the Ludlow and Downton bone beds, Welsh Basin, UK
Size, shape, and systematics of the Silurian trilobite Aulacopleura koninckii
Species of the Devonian aulacopleurid trilobite Cyphaspides from southeastern Morocco
THE SILURIAN-DEVONIAN BOUNDARY IN THE BARRANDIAN
The late Aeronian graptolite sedgwickii Event, associated positive carbon isotope excursion and facies changes in the Prague Synform (Barrandian area, Bohemia)
Abstract High-resolution petrophysical logging magnetic susceptibility measurements (MS) and gamma-ray spectrometry (GRS), supplemented by rock magnetic measurements (anhysteretic and isothermal remanent magnetizations (ARM/IRM), frequency-dependent MS (FDMS)) and MS logs alignment using the dynamic time warping (DTW) algorithm, were constrained by upgraded conodont biozonation across the Lau Event interval (LEI). Two sections (Pozary and Muslovka) representing shallow-water facies in the Prague Synform were studied. Conodont data and DTW alignment show that Muslovka represents a less complete succession when compared to the Pozary. DTW alignment of the MS logs shows perfect match of the logs and detected six prominent and several minor gaps. MS logs show elevated values and triple peaks at both sections across the LEI which start in the uppermost part of the siluricus Biozone. Magnetite was identified as the main carrier of the MS signal at both sections using ARM and IRM. FDMS revealed occurrence of superparamagnetic (SP) particles at both sections in all selected samples. Furthermore, a higher contribution of SP particles to the MS signal is recorded below the Lau Event interval in the Pozary section. GRS logs show depletion in U concentrations across the LEI at both sections.
Silurian
Abstract In an overview of the Silurian of Central Europe, it is important to realize that during this period the study area was spread more widely over the globe than nowadays because at least two oceans were present in the area which have since disappeared. Several palaeocontinents such as Baltica or Gondwana, smaller palaeo-plates such as Avalonia and Far Eastern Avalonia, and Peri-Gondwana terranes such as Perunica, were separated by the Tornquist Sea and the Rheic Ocean. These palaeocontinents were brought together in the present-day configuration by closing of the oceans and the subsequent orogenic collisions, respectively termed the Caledonian and Variscan orogenies. Plate movements before and during the Alpine orogeny also brought pieces of northern Gondwana into the study area. These Proto-Alps are now included in the basement of the Alps and are observable in several tectonic windows (e.g. Carnic Alps).