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Biologically Induced Initiation of Neoproterozoic Snowball-Earth Events
(Proceedings of the National Academy of Sciences, 2011)
The glaciations of the Neoproterozoic Era (1,000 to 542 MyBP) were preceded by dramatically light C isotopic excursions preserved in preglacial deposits. Standard explanations of these excursions involve remineralization ...
Uncovering the Neoproterozoic Carbon Cycle
(Nature Publishing Group, 2012)
Interpretations of major climatic and biological events in Earth history are, in large part, derived from the stable carbon isotope records of carbonate rocks and sedimentary organic matter1,2. Neoproterozoic carbonate ...
What Role for Short-Lived Climate Pollutants in Mitigation Policy?
(American Association for the Advancement of Science (AAAS), 2013)
Short-lived climate pollutants (SLCPs) include methane (CH4), black carbon (BC), tropospheric ozone, and hydrofluorocarbons (HFCs). They are important contributors to anthropogenic climate change, responsible for as much ...
The Stratigraphic Relationship Between the Shuram Carbon Isotope Excursion, the Oxygenation of Neoproterozoic Oceans, and the First Appearance of the Ediacara Biota and Bilaterian Trace Fossils in Northwestern Canada
(Elsevier BV, 2013)
A mechanistic understanding of relationships between global glaciation, a putative second rise in atmospheric oxygen, the Shuram carbon isotope excursion, and the appearance of Ediacaran-type fossil impressions and ...
Searching for an oxygenation event in the fossiliferous Ediacaran of northwestern Canada
(Elsevier BV, 2013)
Late Neoproterozoic (Ediacaran) strata from northwestern Canada provide a thick and rich sedimentological record, preserving intercalated carbonates and shale extending from the ~ 635 million year old Marinoan glacial ...
Authigenic Carbonate and the History of the Global Carbon Cycle
(American Association for the Advancement of Science (AAAS), 2013)
We present a framework for interpreting the carbon isotopic composition of sedimentary rocks, which in turn requires a fundamental reinterpretation of the carbon cycle and redox budgets over Earth's history. We propose ...
Geobiology of the Late Paleoproterozoic Duck Creek Formation, Western Australia
(Elsevier, 2010)
The ca. 1.8 Ga Duck Creek Formation, Western Australia, preserves 1000 m of carbonates and minor iron formation that accumulated along a late Paleoproterozoic ocean margin. Two upward-deepening stratigraphic packages are ...
Sedimentology, chemostratigraphy, and stromatolites of lower Paleoproterozoic carbonates, Turee Creek Group, Western Australia
(Elsevier BV, 2015)
The ca. 2.45–2.22 Ga Turee Creek Group, Western Australia, contains carbonate- rich horizons that postdate earliest Proterozoic iron formations, bracket both Paleoproterozoic glaciogenic beds and the onset of the Great ...
Phosphorus sources for phosphatic Cambrian carbonates
(Geological Society of America, 2013)
The fossilization of organic remains and shell material by calcium phosphate minerals provides an illuminating, but time-bounded, window into Ediacaran–Cambrian animal evolution. For reasons that remain unknown, phosphatic ...
Calibrating the Cryogenian
(American Association for the Advancement of Science (AAAS), 2010)
The Neoproterozoic was an era of great environmental and biological change, but a paucity of direct and precise age constraints on strata from this time has prevented the complete integration of these records. We present ...