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Interpreting carbon-isotope excursions: carbonates and organic matter
Abstract Variations in the carbon isotopic compositions of marine carbonate and organic carbon provide a record of changes in the fraction of organic carbon buried through time and may provide cluesExpand
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Orbital time scale and new C-isotope record for Cenomanian-Turonian boundary stratotype
Previous time scales for the Cenomanian-Turonian boundary (CTB) interval containing Oceanic Anoxic Event II (OAE II) vary by a factor of three. In this paper we present a new orbital time scale forExpand
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Miocene evolution of atmospheric carbon dioxide
Changes in pCO2 or ocean circulation are generally invoked to explain warm early Miocene climates and a rapid East Antarctic ice sheet (EAIS) expansion in the middle Miocene. This study reconstructsExpand
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A weathering hypothesis for glaciation at high atmospheric pCO2 during the Late Ordovician
New paired carbonate and organic-carbon isotope analyses from Nevada, USA, together with a consideration of the effects of mountain-building and ice-sheet coverage of the continents on atmosphericExpand
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Carbon Isotope Fluctuations in Cretaceous Pelagic Limestones: Potential Stratigraphic and Petroleum Exploration Tool
Significant short-term carbon isotope fluctuations are present in Cretaceous pelagic limestones from widely distributed onshore sections in the Circum-Atlantic-western Tethyan region. More than 1,000Expand
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The Cenomanian-Turonian Oceanic Anoxic Event, I. Stratigraphy and distribution of organic carbon-rich beds and the marine δ13C excursion
Summary Marine strata deposited during late Cenomanian and early Turonian time display lithological, faunal, and geochemical characteristics which indicate that significant parts of the world oceanExpand
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Two or four Neoproterozoic glaciations
A thick Neoproterozoic carbonate and glaciogenic succession of the southern Congo craton has yielded δ 13 C and 87 Sr/ 86 Sr records through the later Cryogenian (ca. 750–600 Ma) and earlier part ofExpand
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Marine Shales: Depositional Mechanisms and Environments of Ancient Deposits
Organic-carbon-rich strata or "black shales," including dark gray to black, laminated, carbonaceous mudrocks characterized by impoverished benthonic faunas, or devoid of metazoan life, have longExpand
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CHEMICAL WEATHERING ,A TMOSPHERIC CO 2 , AND CLIMATE
There has been considerable controversy concerning the role of chem- ical weathering in the regulation of the atmospheric partial pressure of carbon dioxide, and thus the strength of the greenhouseExpand
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