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  • Gulf of Mannar  (1)
  • Paleoclimatology -- Oligocene.  (1)
  • Phylogeny  (1)
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  • 1
    Online Resource
    Online Resource
    Newark :John Wiley & Sons, Incorporated,
    Keywords: Paleoclimatology -- Oligocene. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (314 pages)
    Edition: 1st ed.
    ISBN: 9781444327434
    Series Statement: International Association of Sedimentologists Series
    DDC: 552/.58
    Language: English
    Note: Carbonate Systems During the Oligocene-Miocene Climatic Transition -- Contents -- Miocene carbonate systems: an introduction -- A synthesis of Late Oligocene through Miocene deep sea temperatures as inferred from foraminiferal Mg/Ca ratios -- Latitudinal trends in Cenozoic reef patterns and their relationship to climate -- Carbonate grain associations: their use and environmental significance, a brief review -- Temperate and tropical carbonate-sedimentation episodes in the Neogene Betic basins (southern Spain) linked to climatic oscillations and changes in Atlantic-Mediterranean connections: constraints from isotopic data -- Facies models and geometries of the Ragusa Platform (SE Sicily, Italy) near the Serravallian-Tortonian boundary -- The sensitivity of a tropical foramol-rhodalgal carbonate ramp to relative sea-level change: Miocene of the central Apennines, Italy -- Facies and sequence architecture of a tropical foramol-rhodalgal carbonate ramp: Miocene of the central Apennines (Italy) -- Facies and stratigraphic architecture of a Miocene warm-temperate to tropical fault-block carbonate platform, Sardinia (Central Mediterranean Sea) -- Coralline algae, oysters and echinoids - a liaison in rhodolith formation from the Burdigalian of the Latium-Abruzzi Platform (Italy) -- Palaeoenvironmental significance of Oligocene-Miocene coralline red algae - a review -- Molluscs as a major part of subtropical shallow-water carbonate production - an example from a Middle Miocene oolite shoal (Upper Serravallian, Austria) -- Echinoderms and Oligo-Miocene carbonate systems: potential applications in sedimentology and environmental reconstruction -- Coral diversity and temperature: a palaeoclimatic perspective for the Oligo-Miocene of the Mediterranean region -- Late Oligocene to Miocene reef formation on Kita-daito-jima, northern Philippine Sea. , Carbonate production in rift basins: models for platform inception, growth and dismantling, and for shelf to basin sediment transport, Miocene Sardinia Rift Basin, Italy -- Index.
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  • 2
    ISSN: 1432-1432
    Keywords: Foraminifera ; Sequence dissimilarity ; LSU rRNA gene ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An unusually high divergence was observed in the ribosomal RNA genes of a free-living population of foraminifera belonging to the genusAmmonia. The sequences of a large-subunit (LSU) rDNA expansion segment D1 and flanking regions were obtained from 20 specimens namedAmmonia sp. 1 andAmmonia sp. 2. The sequence divergence between the two species averages 14%. Within each species it ranges from 0.2% to 7.1% inAmmonia sp. 1 and from 0.7% to 2.3% inAmmonia sp. 2. We did not find two specimens having identical sequences. Moreover, in opposition to the generally acaepted view, rDNA sequence variations were also found within a single individual. The variations among several rDNA copies in a single specimen ofAmmonia may reach up to 4.9%. Most of the observed variations result from multiplication of CA or TA serial repeats occurring in two particularly variable regions. For single base changes, C-T transitions are most frequently observed. We discuss the evolution of expansion segments and their use for phylogenetic studies.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2021-10-01
    Description: Coastal sand dunes are sediment archives which can be used to reconstruct periods of aridity and humidity, past wind strength and variations in the sediment supply related to sea-level changes. In this manner, the sedimentary record of fossil coastal dunes in Sri Lanka provides evidence for environmental and climatic changes during the late Pleistocene and Holocene. As yet, these environmental shifts are poorly resolved because the sedimentary facies and their depositional architecture have not been studied and only very few age constraints are available. Facies analysis of a lithological section at the Point Kurdimalai sea cliff in the Wilpattu National Park (NW Sri Lanka) reveals a striking resemblance to the stratigraphic succession associated with the Teri Sands in southeastern India, which is better dated. The reason is that deposition occurred under the same geological, climatic and geomorphological conditions in the two regions. This special situation allows for litho- and climate stratigraphic correlations across the Gulf of Mannar and links the landscape evolution at Point Kudrimalai to late Quaternary climatic events and sea-level changes. Our results show that the formation of red coastal dunes (Red Beds) in Sri Lanka was a multi-phase process across the Pleistocene–Holocene boundary and hence the differentiation between an Older Group of Plio-Pleistocene age (including the Red Beds) and a Younger Group of Holocene age in the Quaternary stratigraphic chart for Sri Lanka is not justified.
    Keywords: 555 ; Gulf of Mannar ; Indian winter monsoon ; palaeo-environment ; post-glacial transgression ; red coastal dunes ; sea level ; stratigraphy
    Language: English
    Type: map
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