Browsing ELibrary by Subject "JURASSIC"
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Browsing ELibrary by Subject "JURASSIC"
Now showing items 1-19 of 19
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(2004)Cladistic analysis of the Middle Jurassic ammonite radiation shows how the Aalenian-age ancestral stock, known variously as the Hammatocerataceae or Hammatoceratinae, gave rise to numerous new groups in Bajocian times. ...
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(2006)The presence of Cretaceous detrital zircon in Upper Jurassic strata of the Great Valley Group may require revision of the lower Great Valley Group chronostratigraphy, with significant implications for the Late Jurassic-Cretaceous ...
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(2006)In the Mae Sot and Umphang areas (NW Thailand), Jurassic strata seal the Permian and Triassic substratum of the Shan-Thai terrane with a brecciated conglomerate. Pliensbachian to Early Bajocian shallow marine strata are ...
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(2002)The study of septal patterns in ammonoids has been centered on functional and/or constructional issues. Complexly fluted septa have been considered as complementary structures that reinforce the ammonite shell, their frilled ...
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(2006)In order to determine the timing of growth of belemnite rostra, we analyzed microgrowth patterns of seven, excellently preserved specimens of Megateuthis giganteus (v. Schloth.) from the Middle Jurassic of the Hannover ...
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(2006)It is important method to understand provenance types, basin-range evlution and tectonic attributes through detrital composition of sandstones. The sandstone framework grains and detrital heavy minerals of Jurassic in ...
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(2006)Late Jurassic formations of the Northern Calcareous Alps (NCA) contain ample evidence of synsedimentary tectonics in the form of elongate basins filled with turbidites, debris flows and slumps. Clasts are derived from the ...
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(2006)The Sorachi Group, composed of Upper Jurassic ophiolite and Lower Cretaceous island-arc volcano-sedimentary cover, provides a record of Late Jurassic-Early Cretaceous sedimentation and volcanism in an island-arc setting ...
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(2006)General circulation models (GCMs) use the laws of physics and an understanding of past geography to simulate climatic responses. They are objective in character. However, they tend to require powerful computers to handle ...
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(2006)The Jurassic to Early Cretaceous magmatic arc of the Andes in northern Chile was a site of major additions of juvenile magmas from the subarc mantle to the continental crust. The combined effect of extension and a near ...
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(2006)Four new species of mayfly nymphs, Furvoneta relicta sp. nov., Clavineta eximia sp. nov. (originally Mesoneta antiqua), Mesobaetis latifilamentacea sp. nov., and Stackelbergisca cylindrata sp. nov. are described from the ...
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(1999)In this paper we investigate the presence of chaos in the system that underlies the Phanerozoic 87Sr/86Sr isotope record of seawater carbonates by means of nonlinear time series analysis. The Fourier power spectrum estimation ...
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(2006)The Ironside Mountain batholith consists of the 170-Ma Ironside Mountain pluton, the quartz diorite of Happy Camp Mountain, the 167-Ma Denny intrusive complex, and the West China Peak intrusive complex. The contact aureole ...
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(2006)In the intracontinental domain of the northwestern Saharan platform, the deformation of the Palaeozoic sedimentary cover is mainly attributed to a far-field effect of the Hercynian orogeny having occurred at the African-Laurusian ...
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(2006)The wide distribution of the genus Ammosiphonia in the Upper Jurassic and Carboniferous of Western Siberia is established for the first time. Six haplophragmoidid species of Western Siberia are assigned to this genus. The ...
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(2006)The Lince–Estefanía stratabound copper deposit in the Michilla district is one of the most important deposits in the Coastal Cordillera of northern Chile and is one of the most representative of this type of deposit. ...
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(2006)Unusual fining upwards coarse conglomerates overlain by sandstones, thin cherts and green shales occur at the top of the deep-water submarine fan deposits of the Oolitic Limestone Member of the Jurassic Guwayza Formation ...
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(2006)The Upper Oxfordian shell-bearing ferruginous sands from Kłeby in Pomerania (northwestern Poland) provide a rich and relatively well-preserved shallow-water gastropod fauna that has been known in the literature since the ...
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(2006)Jurassic bivalves were quite diverse in the Caucasus-a region located on the northern margin of the Tethys Ocean. Stratigraphic ranges of 513 species were compiled. Total species number, already low, declined during the ...
Now showing items 1-19 of 19