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  • Artikel  (18)
  • Geologic Sediments
  • 2000-2004  (18)
  • 1975-1979
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  • Artikel  (18)
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  • 1
    Publikationsdatum: 2000-07-21
    Beschreibung: The Meishan section across the Permian-Triassic boundary in South China is the most thoroughly investigated in the world. A statistical analysis of the occurrences of 162 genera and 333 species confirms a sudden extinction event at 251.4 million years ago, coincident with a dramatic depletion of delta13C(carbonate) and an increase in microspherules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jin, Y G -- Wang, Y -- Wang, W -- Shang, Q H -- Cao, C Q -- Erwin, D H -- New York, N.Y. -- Science. 2000 Jul 21;289(5478):432-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing 210008, China. ygjin@public1.ptt.js.cn〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10903200" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; China ; *Eukaryota ; *Fishes ; *Fossils ; Geologic Sediments ; *Invertebrates ; *Marine Biology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2004-01-06
    Beschreibung: A newly discovered Paleolithic site on the Yana River, Siberia, at 71 degrees N, lies well above the Arctic circle and dates to 27,000 radiocarbon years before present, during glacial times. This age is twice that of other known human occupations in any Arctic region. Artifacts at the site include a rare rhinoceros foreshaft, other mammoth foreshafts, and a wide variety of tools and flakes. This site shows that people adapted to this harsh, high-latitude, Late Pleistocene environment much earlier than previously thought.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pitulko, V V -- Nikolsky, P A -- Girya, E Yu -- Basilyan, A E -- Tumskoy, V E -- Koulakov, S A -- Astakhov, S N -- Pavlova, E Yu -- Anisimov, M A -- New York, N.Y. -- Science. 2004 Jan 2;303(5654):52-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for the History of Material Culture, Russian Academy of Sciences, 18 Dvortsovaya nab., St. Petersburg 191186, Russia. pitulko.volodya@nmnh.si.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14704419" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Anthropology ; *Archaeology ; Arctic Regions ; Bone and Bones ; *Cold Climate ; Culture ; Emigration and Immigration ; Geologic Sediments ; Humans ; Paleodontology ; Paleontology ; Plants ; Siberia ; Time
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2004-08-07
    Beschreibung: Panoramic Camera images at Gusev crater reveal a rock-strewn surface interspersed with high- to moderate-albedo fine-grained deposits occurring in part as drifts or in small circular swales or hollows. Optically thick coatings of fine-grained ferric iron-rich dust dominate most bright soil and rock surfaces. Spectra of some darker rock surfaces and rock regions exposed by brushing or grinding show near-infrared spectral signatures consistent with the presence of mafic silicates such as pyroxene or olivine. Atmospheric observations show a steady decline in dust opacity during the mission, and astronomical observations captured solar transits by the martian moons, Phobos and Deimos, as well as a view of Earth from the martian surface.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bell, J F 3rd -- Squyres, S W -- Arvidson, R E -- Arneson, H M -- Bass, D -- Blaney, D -- Cabrol, N -- Calvin, W -- Farmer, J -- Farrand, W H -- Goetz, W -- Golombek, M -- Grant, J A -- Greeley, R -- Guinness, E -- Hayes, A G -- Hubbard, M Y H -- Herkenhoff, K E -- Johnson, M J -- Johnson, J R -- Joseph, J -- Kinch, K M -- Lemmon, M T -- Li, R -- Madsen, M B -- Maki, J N -- Malin, M -- McCartney, E -- McLennan, S -- McSween, H Y Jr -- Ming, D W -- Moersch, J E -- Morris, R V -- Dobrea, E Z Noe -- Parker, T J -- Proton, J -- Rice, J W Jr -- Seelos, F -- Soderblom, J -- Soderblom, L A -- Sohl-Dickstein, J N -- Sullivan, R J -- Wolff, M J -- Wang, A -- New York, N.Y. -- Science. 2004 Aug 6;305(5685):800-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cornell University, Ithaca, NY 14853-6801, USA. jfb8@cornell.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15297658" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Atmosphere ; Evolution, Planetary ; Extraterrestrial Environment ; Ferric Compounds ; Geologic Sediments ; Iron Compounds ; *Mars ; Minerals ; Silicates ; Solar System ; Spectrum Analysis ; Water
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2004-12-04
    Beschreibung: Panoramic Camera (Pancam) images from Meridiani Planum reveal a low-albedo, generally flat, and relatively rock-free surface. Within and around impact craters and fractures, laminated outcrop rocks with higher albedo are observed. Fine-grained materials include dark sand, bright ferric iron-rich dust, angular rock clasts, and millimeter-size spheroidal granules that are eroding out of the laminated rocks. Spectra of sand, clasts, and one dark plains rock are consistent with mafic silicates such as pyroxene and olivine. Spectra of both the spherules and the laminated outcrop materials indicate the presence of crystalline ferric oxides or oxyhydroxides. Atmospheric observations show a steady decline in dust opacity during the mission. Astronomical observations captured solar transits by Phobos and Deimos and time-lapse observations of sunsets.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bell, J F 3rd -- Squyres, S W -- Arvidson, R E -- Arneson, H M -- Bass, D -- Calvin, W -- Farrand, W H -- Goetz, W -- Golombek, M -- Greeley, R -- Grotzinger, J -- Guinness, E -- Hayes, A G -- Hubbard, M Y H -- Herkenhoff, K E -- Johnson, M J -- Johnson, J R -- Joseph, J -- Kinch, K M -- Lemmon, M T -- Li, R -- Madsen, M B -- Maki, J N -- Malin, M -- McCartney, E -- McLennan, S -- McSween, H Y Jr -- Ming, D W -- Morris, R V -- Dobrea, E Z Noe -- Parker, T J -- Proton, J -- Rice, J W Jr -- Seelos, F -- Soderblom, J M -- Soderblom, L A -- Sohl-Dickstein, J N -- Sullivan, R J -- Weitz, C M -- Wolff, M J -- New York, N.Y. -- Science. 2004 Dec 3;306(5702):1703-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Astronomy, Cornell University, Ithaca NY 14853, USA. jfb8@cornell.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15576603" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Atmosphere ; Extraterrestrial Environment ; Ferric Compounds ; Geologic Sediments ; Ice ; *Mars ; Silicates ; Spacecraft ; Spectrum Analysis ; Water
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2002-03-16
    Beschreibung: A profound faunal reorganization occurred near the Paleocene/Eocene boundary, when several groups of mammals abruptly appeared on the Holarctic continents. To test the hypothesis that this event featured the dispersal of groups from Asia to North America and Europe, we used isotope stratigraphy, magnetostratigraphy, and quantitative biochronology to constrain the relative age of important Asian faunas. The extinct family Hyaenodontidae appeared in Asia before it did so in North America, and the modern orders Primates, Artiodactyla, and Perissodactyla first appeared in Asia at or before the Paleocene/Eocene boundary. These results are consistent with Asia being a center for early mammalian origination.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bowen, Gabriel J -- Clyde, William C -- Koch, Paul L -- Ting, Suyin -- Alroy, John -- Tsubamoto, Takehisa -- Wang, Yuanqing -- Wang, Yuan -- New York, N.Y. -- Science. 2002 Mar 15;295(5562):2062-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth Sciences, University of California, Santa Cruz, CA 95064, USA. gbowen@es.ucsc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11896275" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Artiodactyla ; Asia ; Carbon Isotopes ; China ; Climate ; Europe ; Fossils ; Geologic Sediments ; *Mammals ; North America ; *Paleontology ; Perissodactyla ; Phylogeny ; Primates ; Time
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Publikationsdatum: 2000-08-11
    Beschreibung: The Acheulean site of Gesher Benot Ya'aqov in the Dead Sea Rift of Israel documents hominin movements and technological development on a corridor between Africa and Eurasia. New age data place the site at 780,000 years ago (oxygen isotope stage 19), considerably older than previous estimates. The archaeological data from the site portray strong affinities with African stone tool traditions. The findings also reflect adroit technical skills and in-depth planning abilities, more advanced and complex than those of earlier archaeological occurrences in the Levant.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Goren-Inbar, N -- Feibel, C S -- Verosub, K L -- Melamed, Y -- Kislev, M E -- Tchernov, E -- Saragusti, I -- New York, N.Y. -- Science. 2000 Aug 11;289(5481):944-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Archaeology, Hebrew University, Mt. Scopus, Jerusalem 91905, Israel. goren@cc.huji.ac.il〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10937996" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Africa ; Animals ; *Archaeology ; *Fossils ; Geologic Sediments ; History, Ancient ; *Hominidae ; Humans ; Israel ; Paleontology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Publikationsdatum: 2004-12-04
    Beschreibung: Sedimentary rocks at Eagle crater in Meridiani Planum are composed of fine-grained siliciclastic materials derived from weathering of basaltic rocks, sulfate minerals (including magnesium sulfate and jarosite) that constitute several tens of percent of the rock by weight, and hematite. Cross-stratification observed in rock outcrops indicates eolian and aqueous transport. Diagenetic features include hematite-rich concretions and crystal-mold vugs. We interpret the rocks to be a mixture of chemical and siliciclastic sediments with a complex diagenetic history. The environmental conditions that they record include episodic inundation by shallow surface water, evaporation, and desiccation. The geologic record at Meridiani Planum suggests that conditions were suitable for biological activity for a period of time in martian history.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Squyres, S W -- Grotzinger, J P -- Arvidson, R E -- Bell, J F 3rd -- Calvin, W -- Christensen, P R -- Clark, B C -- Crisp, J A -- Farrand, W H -- Herkenhoff, K E -- Johnson, J R -- Klingelhofer, G -- Knoll, A H -- McLennan, S M -- McSween, H Y Jr -- Morris, R V -- Rice, J W Jr -- Rieder, R -- Soderblom, L A -- New York, N.Y. -- Science. 2004 Dec 3;306(5702):1709-14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Astronomy, Cornell University, Ithaca, NY 14853, USA. squyres@astrosun.tn.cornell.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15576604" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Exobiology ; Extraterrestrial Environment ; Ferric Compounds ; Geologic Sediments ; Life ; *Mars ; Minerals ; Silicates ; Spacecraft ; Spectrum Analysis ; Sulfates ; Sulfur ; *Water
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Publikationsdatum: 2004-08-07
    Beschreibung: The Miniature Thermal Emission Spectrometer (Mini-TES) on Spirit has studied the mineralogy and thermophysical properties at Gusev crater. Undisturbed soil spectra show evidence for minor carbonates and bound water. Rocks are olivinerich basalts with varying degrees of dust and other coatings. Dark-toned soils observed on disturbed surfaces may be derived from rocks and have derived mineralogy (+/-5 to 10%) of 45% pyroxene (20% Ca-rich pyroxene and 25% pigeonite), 40% sodic to intermediate plagioclase, and 15% olivine (forsterite 45% +/-5 to 10). Two spectrally distinct coatings are observed on rocks, a possible indicator of the interaction of water, rock, and airfall dust. Diurnal temperature data indicate particle sizes from 40 to 80 microm in hollows to approximately 0.5 to 3 mm in soils.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Christensen, P R -- Ruff, S W -- Fergason, R L -- Knudson, A T -- Anwar, S -- Arvidson, R E -- Bandfield, J L -- Blaney, D L -- Budney, C -- Calvin, W M -- Glotch, T D -- Golombek, M P -- Gorelick, N -- Graff, T G -- Hamilton, V E -- Hayes, A -- Johnson, J R -- McSween, H Y Jr -- Mehall, G L -- Mehall, L K -- Moersch, J E -- Morris, R V -- Rogers, A D -- Smith, M D -- Squyres, S W -- Wolff, M J -- Wyatt, M B -- New York, N.Y. -- Science. 2004 Aug 6;305(5685):837-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geological Sciences, Arizona State University, Tempe, AZ 85287, USA. phil.christensen@asu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15297667" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Carbonates ; Geologic Sediments ; Interferometry ; Iron Compounds ; Magnesium Compounds ; *Mars ; *Minerals ; Oxides ; Silicates ; Spectrum Analysis ; Temperature ; Water
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Publikationsdatum: 2003-06-07
    Beschreibung: The Thermal Emission Imaging System (THEMIS) on Mars Odyssey has produced infrared to visible wavelength images of the martian surface that show lithologically distinct layers with variable thickness, implying temporal changes in the processes or environments during or after their formation. Kilometer-scale exposures of bedrock are observed; elsewhere airfall dust completely mantles the surface over thousands of square kilometers. Mars has compositional variations at 100-meter scales, for example, an exposure of olivine-rich basalt in the walls of Ganges Chasma. Thermally distinct ejecta facies occur around some craters with variations associated with crater age. Polar observations have identified temporal patches of water frost in the north polar cap. No thermal signatures associated with endogenic heat sources have been identified.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Christensen, Philip R -- Bandfield, Joshua L -- Bell, James F 3rd -- Gorelick, Noel -- Hamilton, Victoria E -- Ivanov, Anton -- Jakosky, Bruce M -- Kieffer, Hugh H -- Lane, Melissa D -- Malin, Michael C -- McConnochie, Timothy -- McEwen, Alfred S -- McSween, Harry Y Jr -- Mehall, Greg L -- Moersch, Jeffery E -- Nealson, Kenneth H -- Rice, James W Jr -- Richardson, Mark I -- Ruff, Steven W -- Smith, Michael D -- Titus, Timothy N -- Wyatt, Michael B -- New York, N.Y. -- Science. 2003 Jun 27;300(5628):2056-61. Epub 2003 Jun 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geological Sciences, Arizona State University, Tempe, AZ 85287-6305, USA. phil.christensen@asu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12791998" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Carbon Dioxide ; Extraterrestrial Environment ; Geologic Sediments ; Geological Phenomena ; Geology ; *Mars ; Seasons ; Temperature ; Water
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Publikationsdatum: 2004-08-07
    Beschreibung: The Spirit landing site in Gusev Crater on Mars contains dark, fine-grained, vesicular rocks interpreted as lavas. Pancam and Mini-Thermal Emission Spectrometer (Mini-TES) spectra suggest that all of these rocks are similar but have variable coatings and dust mantles. Magnified images of brushed and abraded rock surfaces show alteration rinds and veins. Rock interiors contain 〈/=25% megacrysts. Chemical analyses of rocks by the Alpha Particle X-ray Spectrometer are consistent with picritic basalts, containing normative olivine, pyroxenes, plagioclase, and accessory FeTi oxides. Mossbauer, Pancam, and Mini-TES spectra confirm the presence of olivine, magnetite, and probably pyroxene. These basalts extend the known range of rock compositions composing the martian crust.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McSween, H Y -- Arvidson, R E -- Bell, J F 3rd -- Blaney, D -- Cabrol, N A -- Christensen, P R -- Clark, B C -- Crisp, J A -- Crumpler, L S -- Des Marais, D J -- Farmer, J D -- Gellert, R -- Ghosh, A -- Gorevan, S -- Graff, T -- Grant, J -- Haskin, L A -- Herkenhoff, K E -- Johnson, J R -- Jolliff, B L -- Klingelhoefer, G -- Knudson, A T -- McLennan, S -- Milam, K A -- Moersch, J E -- Morris, R V -- Rieder, R -- Ruff, S W -- De Souza, P A Jr -- Squyres, S W -- Wanke, H -- Wang, A -- Wyatt, M B -- Yen, A -- Zipfel, J -- New York, N.Y. -- Science. 2004 Aug 6;305(5685):842-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996-1410, USA. mcsween@utk.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15297668" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Extraterrestrial Environment ; Geologic Sediments ; Iron Compounds ; Magnesium Compounds ; *Mars ; *Minerals ; Oxides ; *Silicates ; Spectroscopy, Mossbauer ; Spectrum Analysis ; Water
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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