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  • Geosciences (General)  (29)
  • *Biological Evolution  (7)
  • 1
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    Proterozoic ocean chemistry and evolution: a bioinorganic bridge? (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-08-17
    Description: Recent data imply that for much of the Proterozoic Eon (2500 to 543 million years ago), Earth's oceans were moderately oxic at the surface and sulfidic at depth. Under these conditions, biologically important trace metals would have been scarce in most marine environments, potentially restricting the nitrogen cycle, affecting primary productivity, and limiting the ecological distribution of eukaryotic algae. Oceanic redox conditions and their bioinorganic consequences may thus help to explain observed patterns of Proterozoic evolution.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anbar, A D -- Knoll, A H -- New York, N.Y. -- Science. 2002 Aug 16;297(5584):1137-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USA. anbar@earth.rochester.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12183619" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Archaea/growth & development/metabolism ; Bacteria/growth & development/metabolism ; *Biological Evolution ; *Ecosystem ; *Eukaryota/growth & development/metabolism ; Fossils ; Geologic Sediments/chemistry ; Iron/analysis/chemistry/metabolism ; Nitrogen/analysis/chemistry/metabolism ; Oceans and Seas ; Oxidation-Reduction ; Oxygen/analysis/chemistry/metabolism ; *Seawater ; Sulfides/analysis/chemistry/metabolism ; Trace Elements/chemistry/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Early animal evolution: emerging views from comparative biology and geology (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-06-26
    Description: The Cambrian appearance of fossils representing diverse phyla has long inspired hypotheses about possible genetic or environmental catalysts of early animal evolution. Only recently, however, have data begun to emerge that can resolve the sequence of genetic and morphological innovations, environmental events, and ecological interactions that collectively shaped Cambrian evolution. Assembly of the modern genetic tool kit for development and the initial divergence of major animal clades occurred during the Proterozoic Eon. Crown group morphologies diversified in the Cambrian through changes in the genetic regulatory networks that organize animal ontogeny. Cambrian radiation may have been triggered by environmental perturbation near the Proterozoic-Cambrian boundary and subsequently amplified by ecological interactions within reorganized ecosystems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Knoll, A H -- Carroll, S B -- New York, N.Y. -- Science. 1999 Jun 25;284(5423):2129-37.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10381872" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Ecosystem ; *Fossils ; Genes, Homeobox ; *Geologic Sediments ; Oxygen ; *Paleontology ; Phylogeny
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    A bangiophyte red alga from the Proterozoic of arctic Canada (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-10-05
    Description: Silicified peritidal carbonate rocks of the 1250- to 750-million-year-old Hunting Formation, Somerset Island, arctic Canada, contain fossils of well-preserved bangiophyte red algae. Morphological details, especially the presence of multiseriate filaments composed of radially arranged wedge-shaped cells derived by longitudinal divisions from disc-shaped cells in uniseriate filaments, indicate that the fossils are related to extant species in the genus Bangia. Such taxonomic resolution distinguishes these fossils from other pre-Ediacaran eukaryotes and contributes to growing evidence that multicellular algae diversified well before the Ediacaran radiation of large animals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Butterfield, N J -- Knoll, A H -- Swett, K -- New York, N.Y. -- Science. 1990 Oct 5;250:104-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Botanical Museum, Harvard University, Cambridge, MA 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11538072" target="_blank"〉PubMed〈/a〉
    Keywords: *Biological Evolution ; Canada ; *Fossils ; Geological Phenomena ; Geology ; Paleontology ; Rhodophyta/*classification/cytology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    The early evolution of eukaryotes: a geological perspective (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-05-01
    Description: Molecular phylogenies of eukaryotic organisms imply patterns of biological and environmental history that can be tested against the geological record. As predicted by sequence comparisons, Precambrian rocks show evidence of episodic increases in biological diversity and atmospheric oxygen concentrations. Nonetheless, complete integration of the two records remains elusive and may require that the earliest macroscopic organisms be recognized as extinct experiments in eukaryotic multicellularity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Knoll, A H -- New York, N.Y. -- Science. 1992 May 1;256(5057):622-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Harvard University, Botanical Museum, Cambridge, MA 02138.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1585174" target="_blank"〉PubMed〈/a〉
    Keywords: *Biological Evolution ; Cyanobacteria ; Eukaryota ; *Eukaryotic Cells ; Fossils ; Geological Phenomena ; *Geology ; Mitochondria ; Phylogeny
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    The evolution of modern eukaryotic phytoplankton (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-07-17
    Description: The community structure and ecological function of contemporary marine ecosystems are critically dependent on eukaryotic phytoplankton. Although numerically inferior to cyanobacteria, these organisms are responsible for the majority of the flux of organic matter to higher trophic levels and the ocean interior. Photosynthetic eukaryotes evolved more than 1.5 billion years ago in the Proterozoic oceans. However, it was not until the Mesozoic Era (251 to 65 million years ago) that the three principal phytoplankton clades that would come to dominate the modern seas rose to ecological prominence. In contrast to their pioneering predecessors, the dinoflagellates, coccolithophores, and diatoms all contain plastids derived from an ancestral red alga by secondary symbiosis. Here we examine the geological, geochemical, and biological processes that contributed to the rise of these three, distantly related, phytoplankton groups.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Falkowski, Paul G -- Katz, Miriam E -- Knoll, Andrew H -- Quigg, Antonietta -- Raven, John A -- Schofield, Oscar -- Taylor, F J R -- New York, N.Y. -- Science. 2004 Jul 16;305(5682):354-60.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Marine and Coastal Sciences, Rutgers University, 71 Dudley Road, New Brunswick, NJ 08540, USA. falko@imcs.rutgers.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15256663" target="_blank"〉PubMed〈/a〉
    Keywords: Biodiversity ; *Biological Evolution ; *Ecosystem ; Fossils ; Phylogeny ; *Phytoplankton/classification/cytology/physiology ; Plastids/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Comparative Earth history and Late Permian mass extinction (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-07-26
    Description: The repeated association during the late Neoproterozoic Era of large carbon-isotopic excursions, continental glaciation, and stratigraphically anomalous carbonate precipitation provides a framework for interpreting the reprise of these conditions on the Late Permian Earth. A paleoceanographic model that was developed to explain these stratigraphically linked phenomena suggests that the overturn of anoxic deep oceans during the Late Permian introduced high concentrations of carbon dioxide into surficial environments. The predicted physiological and climatic consequences for marine and terrestrial organisms are in good accord with the observed timing and selectivity of Late Permian mass extinction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Knoll, A H -- Bambach, R K -- Canfield, D E -- Grotzinger, J P -- New York, N.Y. -- Science. 1996 Jul 26;273:452-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Botanical Museum, Harvard University, Cambridge, MA 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11541222" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Calcification, Physiologic ; Carbon Dioxide/*chemistry ; Carbon Isotopes ; Earth (Planet) ; Geological Phenomena ; *Geology ; Hypercapnia/etiology/physiopathology ; Models, Chemical ; Oxygen/*chemistry ; Paleontology ; Seawater/*chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Calibrating rates of early Cambrian evolution (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-09-03
    Description: An explosive episode of biological diversification occurred near the beginning of the Cambrian period. Evolutionary rates in the Cambrian have been difficult to quantify accurately because of a lack of high-precision ages. Currently, uranium-lead zircon geochronology is the most powerful method for dating rocks of Cambrian age. Uranium-lead zircon data from lower Cambrian rocks located in northeast Siberia indicate that the Cambrian period began at approximately 544 million years ago and that its oldest (Manykaian) stage lasted no less than 10 million years. Other data indicate that the Tommotian and Atdabanian stages together lasted only 5 to 10 million years. The resulting compression of Early Cambrian time accentuates the rapidity of both the faunal diversification and subsequent Cambrian turnover.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bowring, S A -- Grotzinger, J P -- Isachsen, C E -- Knoll, A H -- Pelechaty, S M -- Kolosov, P -- New York, N.Y. -- Science. 1993 Sep 3;261:1293-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11539488" target="_blank"〉PubMed〈/a〉
    Keywords: *Biological Evolution ; *Fossils ; Geologic Sediments/*analysis ; Isotopes ; Lead ; Paleontology/*methods ; Siberia ; Silicates ; Uranium ; Zirconium
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Early animal evolution: emerging views from comparative biology and geology (1999)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Cambrian appearance of fossils representing diverse phyla has long inspired hypotheses about possible genetic or environmental catalysts of early animal evolution. Only recently, however, have data begun to emerge that can resolve the sequence of genetic and morphological innovations, environmental events, and ecological interactions that collectively shaped Cambrian evolution. Assembly of the modern genetic tool kit for development and the initial divergence of major animal clades occurred during the Proterozoic Eon. Crown group morphologies diversified in the Cambrian through changes in the genetic regulatory networks that organize animal ontogeny. Cambrian radiation may have been triggered by environmental perturbation near the Proterozoic-Cambrian boundary and subsequently amplified by ecological interactions within reorganized ecosystems.
    Keywords: Geosciences (General)
    Type: Science (ISSN 0036-8075); Volume 284; 5423; 2129-37
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  • 9
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    Marine pisolites from Upper Proterozoic carbonates of East Greenland and Spitsbergen (1989)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Upper Proterozoic carbonate successions from central East Greenland (the Limestone-Dolomite 'Series' of the Eleonore Bay Group) and Svalbard (the Backlundtoppen Formation of the Akademikerbreen) Group, Spitsbergen, and the Upper Russo Formation of the Raoldtoppen Group, Nordaustlandet) contain thick sequences dominated by pisolites. These rocks were generated in shallow marine environments, and the pisoids are essentially oversized ooids. A marine environment is supported by the thickness and lateral extent of the carbonates; by a sedimentary association of pisolites with stromatolites, flake-conglomerates, calcarenites, calcilutites, microphytolites, and ooids similar to that found in numerous other Proterozoic carbonate successions; by sedimentary structures, including cross-beds and megaripples that characterize the pisolitic beds; and by microorganisms that inhabit modern marine ooids of the Bahama Banks. Petrographic features and strontium abundances suggest that the pisoids were originally aragonitic, but neomorphism, silicification, calcitization, and dolomitization have extensively modified original mineralogies and fabrics. The East Greenland and Svalbard pisolitic carbonates reflect similar depositional environments and diagenetic histories, reinforcing previous bio-, litho-, and chemostratigraphic interpretations that the two sequences accumulated contiguously in a coastal zone of pisoid genesis which extended for at least 600, and probably 1000 or more, kilometres.
    Keywords: Geosciences (General)
    Type: Sedimentology (ISSN 0037-0746); 36; 75-93
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  • 10
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    Anomalous carbonate precipitates: is the Precambrian the key to the Permian? (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Late Permian reefs of the Capitan complex, west Texas; the Magnesian Limestone, England; Chuenmuping reef, south China; and elsewhere contain anomalously large volumes of aragonite and calcite marine cements and sea-floor crusts, as well as abundant microbial precipitates. These components strongly influenced reef growth and may have been responsible for the construction of rigid, open reefal frames in which bryozoans and sponges became encrusted and structurally reinforced. In some cases, such as the upper biostrome of the Magnesian Limestone, precipitated microbialites and inorganic crusts were the primary constituents of the reef core. These microbial and inorganic reefs do not have modern marine counterparts; on the contrary, their textures and genesis are best understood through comparison with the older rock record, particularly that of the early Precambrian. Early Precambrian reefal facies are interpreted to have formed in a stratified ocean with anoxic deep waters enriched in carbonate alkalinity. Upwelling mixed deep and surface waters, resulting in massive seafloor precipitation of aragonite and calcite. During Mesoproterozoic and early Neoproterozoic time, the ocean became more fully oxidized, and seafloor carbonate precipitation was significantly reduced. However, during the late Neoproterozoic, sizeable volumes of deep ocean water once again became anoxic for protracted intervals; the distinctive "cap carbonates" found above Neoproterozoic tillites attest to renewed upwelling of anoxic bottom water enriched in carbonate alkalinity and 12C. Anomalous late Permian seafloor precipitates are interpreted as the product, at least in part, of similar processes. Massive carbonate precipitation was favored by: 1) reduced shelf space for carbonate precipitation, 2) increased flux of Ca to the oceans during increased continental erosion, 3) deep basinal anoxia that generated upwelling waters with elevated alkalinities, and 4) further evolution of ocean water in the restricted Delaware, Zechstein, and other basins. Temporal coincidence of these processes resulted in surface seawater that was greatly supersaturated by Phanerozoic standards and whose only precedents occurred in Precambrian oceans.
    Keywords: Geosciences (General)
    Type: Palaios (ISSN 0883-1351); 10; 6; 578-96
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